User:PaleoGeekSquared/sandbox2

From Wikipedia, the free encyclopedia

Spinosaurids
Temporal range: Late Jurassic–Late Cretaceous, 148–85 Ma Possible Late Maastrichtian record
Skeletal reconstruction of Spinosaurus aegyptiacus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Saurischia
Clade: Theropoda
Clade: †Carnosauria (?)
Family: †Spinosauridae
Stromer, 1915
Type species
Spinosaurus aegyptiacus
Stromer, 1915
Subgroups
Synonyms
  • Baryonychidae Charig & Milner, 1986
  • Irritatoridae Martill et al., 1996
  • Sigilmassasauridae Russel, 1996

Spinosauridae (meaning "spined lizards") is a family of megalosauroidean theropod dinosaurs.

They were large bipedal carnivores with elongated, crocodile-like skulls lined with conical teeth bearing little to no serrations, and small crests on top of their heads. The teeth in the front end of their lower jaws fanned out into a spoon-shaped structure called a rosette, which gave the animal a characteristic look. Their shoulders were robust and prominent, bearing relatively large forelimbs with enlarged claws on the first digit of their hands. Many genera exhibited unusually elongated neural spines, which might have supported sails/humps of skin or fat tissue. Spinosaurus, from which the family, subfamily, and tribe borrow their name, is the largest known terrestrial predator known from the fossil record, and might have measured up to 15 m (49 ft) in length.[1]

Most spinosaurids lived during the Cretaceous Period, and fossils of them have been recovered worldwide, including Africa, Europe, South America, Asia, and Australia. Their diets were composed mostly of aquatic prey, additional fossil evidence indicating they fed opportunistically on other animals like small dinosaurs and pterosaurs. Osteological analyses also suggest a semiaquatic lifestyle for some members of this clade.

Description[edit]

Size comparison of various spinosaurids with a human

Although reliable size and weight estimates for most taxa are hindered by the lack of good material, all known spinosaurids were large animals.[2] The smallest, Irritator, measured between 6 and 8 meters in length and 1 tonne (1.1 short tons) in weight.[3][4] While Ichthyovenator, Baryonyx, and Suchomimus ranged from 7.5 to 11 meters long, and weighing between 1 and 5.2 tonnes (1.2 and 5.7 short tons).[5][6][7] Spinosaurus was the largest, capable of reaching lengths over 15 meters (49 ft)[8] and weighing between 7 and 20.9 tonnes (7.7 and 23.0 short tons),[7][9] making it the largest known terrestrial predator. This consistency in large body size among spinosaurids could have evolved as a byproduct of their preference for semi-aquatic lifestyles, as without the need to compete with other large theropods for food, they would have been enabled to grow to massive lengths.[10]

Most spinosaurids had long body plans and relatively short hind limbs typical of megalosauroids, although the hind limbs are unusually reduced in Spinosaurus.

Spinosaurids had relatively large forearms and an enlarged claw on the first digit of the hand.[11] They had hook-shaped coracoids, external nares which are at least behind the teeth of the premaxillae or even further posterior on the skull, a long secondary palate, a terminal rosette of enlarged teeth at the front of the upper and lower jaws, and subconical teeth with either absent or very fine serrations.[11][12]

Neural spine sail variation in three spinosaurids

Spinosaurus aegyptiacus, the type species for the family and subfamily, is known for the vertebrae with elongated neural spines, some over a meter tall, which have been reconstructed as a sail or hump running down its back.[13] In Ichthyovenator, this sail is a half a meter at its highest and split into two at the sacral vertebrae.[14] Suchomimus also has a low, ridge-like sail over its hips, smaller than that of Spinosaurus.[13] Baryonyx, however, lacks a sail.[15] These structures have had many proposed functions over the years, such as thermoregulation,[16] to aid in swimming,[17] to store energy or insulate the animal, or for display purposes, such as intimidating rivals and predators, or attracting mates.[18][19]

Spinosaurids often feature relatively large sagittal crests formed from their nasal bones. These crests have been present in Spinosaurus as a ridge-shaped structure, and in Suchomimus and Baryonyx as smaller bumps on top of the skull.[20] They have also been seen (to a smaller degree) in Irritator[21] and Cristatusaurus.[22]

History of discovery[edit]

Illustration of the Spinosaurus holotype

The first spinosaurid fossil was found circa 1820 by British paleontologist Gideon Mantell in the Wadhurst Clay Formation, it consisted of a single conical tooth.[23] In 1841 Sir Richard Owen mistakenly assigned it to a crocodilian he named Suchosaurus ("crocodile lizard"),[24][25] a second species of Suchosaurus was also named in 1897.[26] However, the spinosaurid nature of Suchosaurus was not recognized until a 1998 redescription of Baryonyx.[27]

The first fossils referred to spinosauridae were discovered in 1912 at the Bahariya Formation in Egypt, they were later described and assigned to a new genus; Spinosaurus aegyptiacus German paleontologist Ernst Stromer in 1915. The dinosaur's name meaning "egyptian spine lizard" in reference to the unusually long neural spines not seen previously in any other theropod. In April of 1944, the holotype specimen of S. aegyptiacus was destroyed during an allied bombing raid in World War II.[28][29] In 1934, Stromer referred a partial skeleton also from the Bahariya Formation to a new species of Spinosaurus,[30] these have since been alternatively assigned to either Carcharodontosaurus[31] or Sigilmassasaurus.[32]

Suchomimus and Baryonyx to scale

In 1983, a relatively complete skeleton was excavated from the Smokejacks pit in Surrey, Engand. These remains were described by Alan J. Charig and Angela C. Milner in 1986 as the holotype of a new genus, Baryonyx. After the discovery of Baryonyx, many new genera have since been described, the majority on very incomplete remains. However, other finds bear enough fossil material and distinct anatomical features to be assigned with confidence. Paul Sereno et al. described Suchomimus in 1998, a baryonychine from Niger on the basis of a relatively complete skeleton found in 1997. Later in 2004, partial jaw bones were recovered from the Alcântara Formation, these were referred to a new genus of spinosaurine named Oxalaia in 2011 by Alexander Kellner. Kellner later went on to describe Ichthyovenator in 2012 as the most completely known spinosaurid from Asia.[29]

Evolutionary history[edit]

Timespan[edit]

The spinosaurids are known to exist from as early as the Late Jurassic, through characteristic teeth which were found in Tendaguru, Tanzania, and attributed to Ostafrikasaurus,[33] 15 Million years prior to Siamosaurus. Baryonychines were common, as represented by Baryonyx, which lived during the Barremian of England and Spain. Baryonyx-like teeth are found from the earlier Hauterivian and later Aptian sediments of Spain, as well as the Hauterivian of England, and the Aptian of Niger. The earliest record of spinosaurines is from Africa; they are present in Albian sediments of Tunisia and Algeria, and in Cenomanian sediments of Egypt and Morocco. Spinosaurines are also found in Hauterivian and Aptian-Albian sediments of Thailand, and Southern China. In Africa, baronychines were common in the Aptian, and then replaced by spinosaurines in the Albian and Cenomanian.[34]

Some intermediate specimens extend the known range of spinosaurids past the youngest dates of named taxa. A single baryonychine tooth was found from the mid-Santonian, in the Majiacun Formation of Henan, China.[35] Possible spinosaur remains were also reported from the late Maastrichtian Maevarano Formation.[36]

Localities[edit]

Map illustrating spinosaurid fossil discoveries

Confirmed spinosaurids have been found on every continent except for North America and Antarctica. The first of which was discovered in 1912 at the Bahariya Formation in Egypt and described in 1915 as Spinosaurus aegyptiacus.[19] Over the years Africa has shown a great abundance in spinosaurid discoveries,[37] such as in the Kem Kem beds of Morocco, which housed an ecosystem full of many large coexisting predators.[38][39] A fragment of a spinosaurine lower jaw from the Early Cretaceous was also reported from Tunisia, and referred to Spinosaurus.[34]

Various views of the Australian Spinosaurid specimen, one on bottom right is of Baryonyx for comparison.[40]

Spinosaurinae's range has also extended to South America, particularly Brazil, with the discoveries of Irritator, Angaturama, and Oxalaia.[41][42] There was also a fossil tooth in Argentina which has been referred to spinosauridae by Salgado et al.[43] This referral is doubted by Tanaka, who offers Hamadasuchus, a crocodilian, as the most likely animal of origin for these teeth.[44]

Baryonychines have been found in Africa, with Suchomimus and Cristatusaurus,[34][45][22] as well as in Europe, with Baryonyx and Suchosaurus.[46] Baryonyx-like teeth are also reported from the Ashdown Sands of Sussex, in England, and the Burgos Province, in Spain. A partial skeleton and many fossil teeth also hint at the possibility of spinosaurids being widespread in Asia. As of 2012, three have been named: Ichthyovenator; a baryonychine,[14] and Siamosaurus and "Sinopliosaurus" fusuiensis; two indeterminate spinosaurids.[34][35] At la Cantalera-1, a site in the Early Barremanian Blesa Formation in Treul, Spain, two types of spinosaurid teeth were found, and they were assigned, tentatively, as indeterminate spinosaurine and baryonychine taxa.[47]

An intermediate spinosaurid was discovered in the Early Cretaceous Eumeralla Formation, Australia.[48] It is known from a single 4 cm long partial cervical vertebra, designated P221081. It is missing most of the neural arch. The specimen is from a juvenile estimated to be about 2 to 3 meters long (6-9 ft). Out of all spinosaurs it most closely resembles Baryonyx.[49]

Classification[edit]

Life restoration of Irritator

The family Spinosauridae was named by Ernst Stromer in 1915 to include the single genus Spinosaurus. The clade was expanded as more close relatives of Spinosaurus were uncovered. The first cladistic definition of spinosauridae was provided by Paul Sereno in 1998 (as "All spinosaurids closer to Spinosaurus than to Torvosaurus).

Taxonomy[edit]

Traditionally, spinosauridae is divided into two subfamilies: spinosaurinae, which contains the genera Irritator, Oxalaia, and Spinosaurus,[34] is marked by unserrated, straight teeth, and external nares which are further back on the skull than in baryonychinae.[50][51] And baryonychinae, which contains the genera Baryonyx and Suchomimus,[34] is marked by serrated, slightly curved teeth, smaller size, and more teeth in the lower jaw behind the terminal rosette than in spinosaurines.[50][51] Most spinosaurid taxa are known from teeth, such as ''Sinopliosaurus'' fusuiensis, Siamosaurus, and Ostafrikasaurus. This incompleteness of remains has led to questionable validity for most of them,[34] some of the material for these poorly known genera bear a high resemblance to more completely known taxa, such as Suchosaurus and Cristatusaurus, which may in the future be assigned to Baryonyx and Suchomimus respectively.[29]

Phylogeny[edit]

The subfamily Spinosaurinae was named by Sereno in 1998, and defined by Holtz et al. (2004) as all taxa closer to Spinosaurus aegyptiacus than to Baryonyx walkeri. And the subfamily Baryonychinae was named by Charig & Milner in 1986. They erected both the subfamily and the family Baryonychinae for the newly discovered Baryonyx, before it was referred to the Spinosauridae. Their subfamily was defined by Holtz et al. in 2004, as the complementary clade of all taxa closer to Baryonyx walkeri than to Spinosaurus aegyptiacus. Examinations by Marcos Sales and Cesar Schultz et al. indicate that the South American spinosaurids Angaturama, Irritator, and Oxalaia were intermediate between Baronychinae and Spinosaurinae based on their craniodental features and cladistic analysis. This indicates that Baryonychinae may in fact be non-monophyletic. Their cladogram can be seen below.[52]

Spinosauridae

The next cladogram displays an analysis of Tetanurae simplified to show only Spinosauridae from Allain et al. (2012):[53]

Spinosauridae

Paleobiology[edit]

Lifestyle and hunting[edit]

Life restoration of Baryonyx with a fish in its jaws

Spinosaurid teeth resemble those of crocodiles, which are used for piercing and holding prey. Therefore, teeth with small or no serrations, such as in spinosaurids, were not good for cutting or ripping into flesh but instead to ensure a strong grip on a struggling prey animal.[54] Spinosaur jaws were likened by Vullo et al. to those of the pike conger eel, in what they hypothesized was convergent evolution for aquatic feeding.[55] Both kinds of animals have some teeth in the end of the upper and lower jaws that are larger than the others and an area of the upper jaw with smaller teeth, creating a gap into which the enlarged teeth of the lower jaw fit, with the full structure called a terminal rosette.[55]

Jaws of Spinosaurus compared with those of Dubreuillosaurus and a pike conger eel

Spinosaurids have in the past often been considered mainly fish-eaters (piscivores), based on comparisons of their jaws with those of modern crocodilians.[51] Rayfield and colleagues, in 2007, conducted biomechanical studies on the skull of the European spinosaurid Baryonyx, which has a long, laterally compressed skull, comparing it to gharial (long, narrow, tubular) and alligator (flat and wide) skulls.[56] They found that the structure of baryonychine jaws converged on that of gharials, in that the two taxa showed similar response patterns to stress from simulated feeding loads, and did so with and without the presence of a (simulated) secondary palate. The gharial, exemplar of a long, narrow, and tubular snout, is a fish specialist. However, this snout anatomy doesn’t preclude other options for the spinosaurids. While the gharial is the most extreme example and a fish specialist, and Australian freshwater crocodiles (Crocodylus johnstoni), which have similarly shaped skulls to gharials, also specialize more on fish than sympatric, broad snouted crocodiles. And are opportunistic feeders which eat all manner of small aquatic prey, including insects and crustaceans.[56] Thus, their aptly shaped snouts correlate with fish-eating, this is consistent with hypotheses of this diet for spinosaurids, in particular baryonychines, but it does not indicate that they were solely piscivorous.

Annotated skull and reconstructed head of Spinosaurus
Annotated skull and reconstructed head of Spinosaurus

A further study by Cuff and Rayfield (2013) on the skulls of Spinosaurus and Baryonyx did not recover similarities in the skulls of Baryonyx and the gharial that the previous study did. Baryonyx had, in models where the size difference of the skulls was corrected for, greater resistance to torsion and dorsoventral bending than both Spinosaurus and the gharial, while both spinosaurids were inferior to the gharial, alligator, and slender-snouted crocodile in resisting torsion and medio-lateral bending.[57] When the results from the modeling were not scaled according to size, then both spinosaurids performed better than all the crocodilians in resistance to bending and torsion, due to their larger size.[57] Thus, Cuff and Rayfield suggest that the skulls are not efficiently built to deal well with relatively large, struggling prey, but that the spinosaurids may overcome prey simply by their size advantage, and not skull build[57] Sues and colleagues studied the construction of the spinosaurid skull, and concluded that their mode of feeding was to use extremely quick, powerful strikes to seize small prey items using their jaws, whilst employing the powerful neck muscles in rapid up-and-down motion. Due to the narrow snout, vigorous side-to-side motion of the skull during prey capture is unlikely.[54] Based the size and positions of their nostrils, Sales & Schultz (2017) suggested that Spinosaurus possessed a greater reliance on its sense of smell and a more piscivorous lifestyle than Irritator and baryonychines.[52]

Reconstructed Suchomimus arm, showing the large claw on the first finger

Forelimbs[edit]

Dorsal Sails[edit]

Posture[edit]

Paleoecology[edit]

Habitat[edit]

Coastal mudflats, such as those inhabited by many spinosaurids

Substantial direct and statistical evidence has shown that spinosaurids often most often inhabited coastal environments. For example, Spinosaurus, from the Cenomanian of North Africa, lived in a humid, tropical environment of tidal flats and channels with mangrove forests.[58]

Similarly, the Brazilian spinosaurine Oxalaia, also lived in the tropics, with flora consisting of conifers, ferns, and horsetails.[59]

Oxalaia, from the Cenomanian Alcântara Formation and, Irritator, from the Aptian-Albian Santana Formation both lived in arid to semi-arid regions, experiencing short, intense rainfall followed by long dry periods.[7][59] Much of the vegetation from Irritator's habitat was xerophytic; it could survive long periods without water.[7]

Spinosaurus spent much of its time in or around water.

From this it is apparent that Cenomanian Northern Africa and northeastern Brazil, inhabited by Spinosaurus and Oxalaia respectively, shared an extremely similar climate and many of the same biota. This is a probable result of Gondwana, a prehistoric supercontinent comprising most of the modern southern hemisphere, as South America and Africa drifted apart from each other during the Middle Jurassic, the flora and fauna on either continent would have continued to evolve separately from each other, contributing to small anatomical differences between taxa.[59][60]

Spinosaurids from northern Gondwana coexisted with many species of Diplodocids, Carcharodontosaurids, and Abelisaurids. Spinosaurus, f

Bone histology[edit]

A 2010 publication by Romain Amiot and colleagues found that oxygen isotope ratios of spinosaurid bones indicates semiaquatic lifestyles. Isotope ratios from teeth from Baryonyx, Irritator, Siamosaurus, and Spinosaurus were compared with isotopic compositions from contemporaneous theropods, turtles, and crocodilians. The study found that, among theropods, spinosaurid isotope ratios were closer to those of turtles and crocodilians. Siamosaurus specimens tended to have the largest difference from the ratios of other theropods, and Spinosaurus tended to have the least difference. The authors concluded that spinosaurids, like modern crocodilians and hippopotamuses, spent much of their daily lives in water. The authors also suggested that semiaquatic habits and piscivory in spinosaurids can explain how spinosaurids coexisted with other large theropods: by feeding on different prey items and living in different habitats, the different types of theropods would have been out of direct competition.[39]

In 2018, an osteological analysis on a partial tibia from an indeterminate spinosaurine from the early Albian. The specimen (designated LPP-PV-0042) revealed osteosclerosis (high bone density) was present in the specimen,[61] this condition had previously only been seen in Spinosaurus, as a possible way of controlling its buoyancy.[62] The leg fragment, found in the Romualdo Formation of the Araripe Basin, was brought to the University of San Carlos and-underwent a CT-Scan. It was determined to have come from a sub-adult individual between 7-13 m in length still growing moderately fast before its death. The presence of a thick-walled cortical bone, indicates that semi-aquatic adaptations in spinosaurids were already present at least 10 million years before Spinosaurus aegyptiacus in Morroco. According to the Phylogenetic bracketing method, extreme bone compactness might be present across all of spinosaurinae.[61]

Feeding[edit]

A fossil of the fish Scheenstia, prey of Baryonyx
Restoration of a spinosaurid feeding on a sauropod in the Sao Khua Formation, with Kinnareemimus in the background

Direct fossil evidence shows that spinosaurids fed on fish as well as a variety of other small to medium-sized animals, including small dinosaurs. Baryonyx was found with scales of the prehistoric fish, Scheenstia, in its body cavity, and these were abraded, hypothetically by gastric juices. Bones of a young Iguanodon, also abraded, were found alongside this specimen. If these represent Baryonyx’s meal, Baryonyx was, whether in this case a hunter, or a scavenger, an eater of more diverse fare than fish.[51][54][63] Moreover, there is a documented example of a spinosaurid having eaten a pterosaur, as spinosaurid teeth were found embedded within the fossil vertebrae of one found in the Santana Formation of Brazil.[41] This may represent a predation event, but Buffetaut et al. consider it more likely that the spinosaurid scavenged the pterosaur carcass after its death. In the Sao Khua Formation of Thailand, isolated tooth crowns from Siamosaurus are sometimes found in association with sauropod remains, indicating possible predation or scavenging.

Info dump:[edit]

Feeding:[edit]

d

Timeline of genera[edit]

CretaceousJurassicLate CretaceousEarly CretaceousLate JurassicMiddle JurassicEarly JurassicSigilmassasaurusOxalaiaIrritatorSpinosaurusAustralian SpinosauridIchthyovenatorSuchomimusCristatusaurusSuchosaurusBaryonyxSiamosaurusOstafrikasaurusCretaceousJurassicLate CretaceousEarly CretaceousLate JurassicMiddle JurassicEarly Jurassic

Timeline of genera descriptions[edit]

21st century in paleontology20th century in paleontology19th century in paleontology2040s in paleontology2030s in paleontology2020s in paleontology2010s in paleontology2000s in paleontology1990s in paleontology1980s in paleontology1970s in paleontology1960s in paleontology1950s in paleontology1940s in paleontology1930s in paleontology1920s in paleontology1910s in paleontology1900s in paleontology1890s in paleontology1880s in paleontology1870s in paleontology1860s in paleontology1850s in paleontology1840s in paleontology1830s in paleontology1820s in paleontologyOstafrikasaurusIchthyovenatorAustralian SpinosauridOxalaiaCristatusaurusSuchomimusSigilmassasaurusIrritatorSiamosaurusBaryonyxSpinosaurusSuchosaurus21st century in paleontology20th century in paleontology19th century in paleontology2040s in paleontology2030s in paleontology2020s in paleontology2010s in paleontology2000s in paleontology1990s in paleontology1980s in paleontology1970s in paleontology1960s in paleontology1950s in paleontology1940s in paleontology1930s in paleontology1920s in paleontology1910s in paleontology1900s in paleontology1890s in paleontology1880s in paleontology1870s in paleontology1860s in paleontology1850s in paleontology1840s in paleontology1830s in paleontology1820s in paleontology

References[edit]

  1. ^ Ibrahim, Nizar; Sereno, Paul C.; Dal Sasso, Cristiano; Maganuco, Simone; Fabri, Matteo; Martill, David M.; Zouhri, Samir; Myhrvold, Nathan; Lurino, Dawid A. (2014). "Semiaquatic adaptations in a giant predatory dinosaur". Science. 345 (6204): 1613–6. Bibcode:2014Sci...345.1613I. doi:10.1126/science.1258750. PMID 25213375. Supplementary Information
  2. ^ HONE, David William Elliott; HOLTZ, Thomas Richard (2017). "A Century of Spinosaurs - A Review and Revision of the Spinosauridae with Comments on Their Ecology". Acta Geologica Sinica - English Edition. 91 (3): 1120–1132. doi:10.1111/1755-6724.13328. ISSN 1000-9515.
  3. ^ Dixon, Dougal (2009). The Ultimate Guide to Dinosaurs. Ticktock Books. ISBN 9781846969881.
  4. ^ Holtz, Thomas R. Jr. (2011) Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages, Winter 2010 Appendix.
  5. ^ S.,, Paul, Gregory. The Princeton field guide to dinosaurs (2nd ed.). Princeton, N.J. ISBN 9781400883141. OCLC 954055249.{{cite book}}: CS1 maint: extra punctuation (link) CS1 maint: multiple names: authors list (link)
  6. ^ Holtz, Thomas R. Jr. (2011) Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages, Winter 2010 Appendix.
  7. ^ a b c d Therrien, François; Henderson, Donald M. (2007-03-12). "My theropod is bigger than yours … or not: estimating body size from skull length in theropods". Journal of Vertebrate Paleontology. 27 (1): 108–115. doi:10.1671/0272-4634(2007)27[108:mtibty]2.0.co;2. ISSN 0272-4634. Cite error: The named reference ":1" was defined multiple times with different content (see the help page).
  8. ^ Ibrahim, Nizar; Sereno, Paul C.; Dal Sasso, Cristiano; Maganuco, Simone; Fabri, Matteo; Martill, David M.; Zouhri, Samir; Myhrvold, Nathan; Lurino, Dawid A. (2014). "Semiaquatic adaptations in a giant predatory dinosaur". Science. 345 (6204): 1613–6. Bibcode:2014Sci...345.1613I. doi:10.1126/science.1258750. PMID 25213375. Supplementary Information
  9. ^ dal Sasso, C.; Maganuco, S.; Buffetaut, E.; Mendez, M.A. (2005). "New information on the skull of the enigmatic theropod Spinosaurus, with remarks on its sizes and affinities" (Submitted manuscript). Journal of Vertebrate Paleontology. 25 (4): 888–896. doi:10.1671/0272-4634(2005)025[0888:NIOTSO]2.0.CO;2. ISSN 0272-4634.
  10. ^ Aureliano, Tito; Ghilardi, Aline M.; Buck, Pedro V.; Fabbri, Matteo; Samathi, Adun; Delcourt, Rafael; Fernandes, Marcelo A.; Sander, Martin (3 May 2018). "Semi-aquatic adaptations in a spinosaur from the Lower Cretaceous of Brazil". Cretaceous Research. doi:10.1016/j.cretres.2018.04.024. ISSN 0195-6671.
  11. ^ a b Sereno, Paul C., Allison L. Beck, Didier B. Dutheil, Boubacar Gado, Hans C. E. Larsson, Gabrielle H. Lyon, Jonathan D. Marcot, et al. 1998. “A Long-Snouted Predatory Dinosaur from Africa and the Evolution of Spinosaurids.” Science 282 (5392): 1298–1302. doi:10.1126/science.282.5392.1298.
  12. ^ Rayfield, Emily J. 2011. “Structural Performance of Tetanuran Theropod Skulls, with Emphasis on the Megalosauridae, Spinosauridae and Carcharodontosauridae.” Special Papers in Palaeontology 86 (November). https://www.researchgate.net/publication/250916680_Structural_performance_of_tetanuran_theropod_skulls_with_emphasis_on_the_Megalosauridae_Spinosauridae_and_Carcharodontosauridae.
  13. ^ a b Hecht, Jeff. 1998. “Fish Swam in Fear.” New Scientist. November 21. https://www.newscientist.com/article/mg16021610-300-fish-swam-in-fear/.
  14. ^ a b Allain, R.; Xaisanavong, T.; Richir, P.; Khentavong, B. (2012). "The first definitive Asian spinosaurid (Dinosauria: Theropoda) from the early cretaceous of Laos". Naturwissenschaften. 99 (5): 369–377. Bibcode:2012NW.....99..369A. doi:10.1007/s00114-012-0911-7. PMID 22528021.
  15. ^ Charig, A. J.; Milner, A. C. (1997). "Baryonyx walkeri, a fish-eating dinosaur from the Wealden of Surrey". Bulletin of the Natural History Museum of London. 53: 11–70.
  16. ^ Halstead, L.B. (1975). The Evolution and Ecology of the Dinosaurs. London: Eurobook Limited. pp. 1–116. ISBN 0-85654-018-8.
  17. ^ "Gimsa, J., Sleigh, R., Gimsa, U., (2015) : "The riddle of Spinosaurus aegyptiacus ' dorsal sail". University of Rostock, Chair for Biophysics, Gertrudenstr. 11A, 18057 Rostock, Germany". {{cite journal}}: Cite journal requires |journal= (help)
  18. ^ Bailey, J.B. (1997). "Neural spine elongation in dinosaurs: sailbacks or buffalo-backs?". Journal of Paleontology. 71 (6): 1124–1146. JSTOR 1306608.
  19. ^ a b Stromer, E. (1915). "Ergebnisse der Forschungsreisen Prof. E. Stromers in den Wüsten Ägyptens. II. Wirbeltier-Reste der Baharije-Stufe (unterstes Cenoman). 3. Das Original des Theropoden Spinosaurus aegyptiacus nov. gen., nov. spec". Abhandlungen der Königlich Bayerischen Akademie der Wissenschaften, Mathematisch-physikalische Klasse (in German). 28 (3): 1–32.[permanent dead link]
  20. ^ Charig, A. J.; Milner, A. C. (1997). "Baryonyx walkeri, a fish-eating dinosaur from the Wealden of Surrey". Bulletin of the Natural History Museum of London. 53: 11–70.
  21. ^ Sues, H. D.; Frey, E.; Martill, D. M.; Scott, D. M. (2002). "Irritator challengeri, a spinosaurid (Dinosauria: Theropoda) from the Lower Cretaceous of Brazil". Journal of Vertebrate Paleontology. 22 (3): 535–547. doi:10.1671/0272-4634(2002)022[0535:ICASDT]2.0.CO;2.
  22. ^ a b Taquet, P. and Russell, D.A. (1998). "New data on spinosaurid dinosaurs from the Early Cretaceous of the Sahara". Comptes Rendus de l'Académie des Sciences à Paris, Sciences de la Terre et des Planètes 327: 347-353
  23. ^ Mantell, G.A., 1822, The fossils of the South Downs or Illustrations of the Geology of Sussex, London, Rupton Relfe
  24. ^ Owen, R. (1840–1845). Odontography. London: Hippolyte Baillière, 655 pp, 1–32
  25. ^ Owen, R., 1842, Report on British fossil reptiles. Part II. Reports of the meetings of the British Association for the Advancement of Science. 11, pp 61-204
  26. ^ Sauvage, H. E. (1897–1898). Vertébrés fossiles du Portugal. Contribution à l’étude des poissons et des reptiles du Jurassique et du Crétacique. Lisbonne: Direction des Travaux géologiques du Portugal, 46p
  27. ^ Milner, A., 2003, "Fish-eating theropods: A short review of the systematics, biology and palaeobiogeography of spinosaurs". In: Huerta Hurtado and Torcida Fernandez-Baldor (eds.). Actas de las II Jornadas Internacionales sobre Paleontologýa de Dinosaurios y su Entorno (2001). pp 129-138
  28. ^ Smith, Joshua B.; Lamanna, Matthew C.; Mayr, Helmut; Lacovara, Kenneth J. (2006-03-01). "New information regarding the holotype of spinosaurus aegyptiacus". Journal of Paleontology. 80 (2): 400–406. doi:10.1666/0022-3360(2006)080[0400:NIRTHO]2.0.CO;2. ISSN 0022-3360.
  29. ^ a b c HONE, David William Elliott; HOLTZ, Thomas Richard (June 2017). "A Century of Spinosaurs - A Review and Revision of the Spinosauridae with Comments on Their Ecology". Acta Geologica Sinica - English Edition. 91 (3): 1120–1132. doi:10.1111/1755-6724.13328. ISSN 1000-9515.
  30. ^ Stromer, E. (1934). "Ergebnisse der Forschungsreisen Prof. E. Stromers in den Wüsten Ägyptens. II. Wirbeltier-Reste der Baharije-Stufe (unterstes Cenoman). 13. Dinosauria". Abhandlungen der Bayerischen Akademie der Wissenschaften Mathematisch-naturwissenschaftliche Abteilung, Neue Folge (in German). 22: 1–79.
  31. ^ Sereno, P.C.; Beck, A.L.; Dutheuil, D.B.; Gado, B.; Larsson, H.C.; Lyon, G.H.; Marcot, J.D.; Rauhut, O.W.M.; Sadleir, R.W.; Sidor, C.A.; Varricchio, D.J.; Wilson, G.P.; Wilson, J.A. (1998). "A long-snouted predatory dinosaur from Africa and the evolution of spinosaurids". Science. 282: 1298–1302. doi:10.1126/science.282.5392.1298. PMID 9812890.
  32. ^ Russell, D.A. (1996). "Isolated dinosaur bones from the Middle Cretaceous of the Tafilalt, Morocco". Bulletin du Muséum National d'Histoire Naturelle, Paris, 4e série, section C. 18 (2–3): 349–402.
  33. ^ Buffetaut, Eric. 2008. “Spinosaurid Teeth from the Late Jurassic of Tendaguru, Tanzania, with Remarks on the Evolutionary and Biogeographical History of the Spinosauridae.” https://www.academia.edu/3101178/Spinosaurid_teeth_from_the_Late_Jurassic_of_Tendaguru_Tanzania_with_remarks_on_the_evolutionary_and_biogeographical_history_of_the_Spinosauridae
  34. ^ a b c d e f g Buffetaut, Eric, and Mohamed Ouaja. 2002. “A New Specimen of Spinosaurus (Dinosauria, Theropoda) from the Lower Cretaceous of Tunisia, with Remarks on the Evolutionary History of the Spinosauridae.” Bulletin de La Société Géologique de France 173 (5): 415–21. doi:10.2113/173.5.415.
  35. ^ a b Hone, Dave, Xing Xu, Deyou Wang, and Vertebrata PalAsiatica. 2010. “A Probable Baryonychine (Theropoda: Spinosauridae) Tooth from the Upper Cretaceous of Henan Province, China (PDF Download Available).” ResearchGate. January. https://www.researchgate.net/publication/271967379_A_probable_Baryonychine_Theropoda_Spinosauridae_tooth_from_the_Upper_Cretaceous_of_Henan_Province_China.
  36. ^ Weishampel, David B.; Barrett, Paul M.; Coria, Rodolfo A.; Le Loueff, Jean; Xu Xing; Zhao Xijin; Sahni, Ashok; Gomani, Elizabeth M. P.; Noto, Christopher N. (2004). "Dinosaur distribution". In Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (eds.). The Dinosauria (2nd ed.). Berkeley: University of California Press. p. 624. ISBN 0-520-24209-2.
  37. ^ Benyoucef, Madani, Emilie Läng, Lionel Cavin, Kaddour Mebarki, Mohammed Adaci, and Mustapha Bensalah. 2015. “Overabundance of Piscivorous Dinosaurs (Theropoda: Spinosauridae) in the Mid-Cretaceous of North Africa: The Algerian Dilemma.” Cretaceous Research 55 (July): 44–55. doi:10.1016/j.cretres.2015.02.002.
  38. ^ Hendrickx, Christophe, Octávio Mateus, and Eric Buffetaut. 2016. “Morphofunctional Analysis of the Quadrate of Spinosauridae (Dinosauria: Theropoda) and the Presence of Spinosaurus and a Second Spinosaurine Taxon in the Cenomanian of North Africa.” PLOS ONE 11 (1): e0144695. doi:10.1371/journal.pone.0144695.
  39. ^ a b Amiot, R.; Buffetaut, E.; Lécuyer, C.; Wang, X.; Boudad, L.; Ding, Z.; Fourel, F.; Hutt, S.; Martineau, F.; Medeiros, A.; Mo, J.; Simon, L.; Suteethorn, V.; Sweetman, S.; Tong, H.; Zhang, F.; Zhou, Z. (2010). "Oxygen isotope evidence for semi-aquatic habits among spinosaurid theropods". Geology. 38 (2): 139–142. Bibcode:2010Geo....38..139A. doi:10.1130/G30402.1.
  40. ^ Farke, Andrew A.; Benson, Roger B. J.; Rich, Thomas H.; Vickers-Rich, Patricia; Hall, Mike (2012). "Theropod Fauna from Southern Australia Indicates High Polar Diversity and Climate-Driven Dinosaur Provinciality". PLoS ONE. 7 (5): e37122. doi:10.1371/journal.pone.0037122. ISSN 1932-6203.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  41. ^ a b Buffetaut, Eric, David Martill, and François Escuillié. 2004. “Pterosaurs as Part of a Spinosaur Diet.” Nature 430. doi:10.1038/430033a.
  42. ^ Kellner, Alexander W.A.; Sergio A.K. Azevedeo; Elaine B. Machado; Luciana B. Carvalho; Deise D.R. Henriques (2011). "A new dinosaur (Theropoda, Spinosauridae) from the Cretaceous (Cenomanian) Alcântara Formation, Cajual Island, Brazil" (PDF). Anais da Academia Brasileira de Ciências. 83 (1): 99–108. doi:10.1590/S0001-37652011000100006. ISSN 0001-3765.
  43. ^ Salgado, Leonardo, José I. Canudo, Alberto C. Garrido, José I. Ruiz-Omeñaca, Rodolfo A. García, Marcelo S. de la Fuente, José L. Barco, and Raúl Bollati. 2009. “Upper Cretaceous Vertebrates from El Anfiteatro Area, Río Negro, Patagonia, Argentina.” Cretaceous Research 30 (3): 767–84. doi:10.1016/j.cretres.2009.01.001.
  44. ^ Tanaka, Gengo. 2017. “Fine Sculptures on a Tooth of Spinosaurus (Dinosauria, Theropoda) from Morocco.” Bulletin of Gunma …. Accessed May 30. https://www.academia.edu/1300482/Fine_sculptures_on_a_tooth_of_Spinosaurus_Dinosauria_Theropoda_from_Morocco.
  45. ^ Sereno, P.C.; Beck, A.L.; Dutheil, D.B.; Gado, B.; Larsson, H.C.E.; Lyon, G.H.; Marcot, J.D.; Rauhut, O.W.M.; Sadleir, R.W.; Sidor, C.A.; Varricchio, D.D.; Wilson, G.P; Wilson, J.A. (1998). "A long-snouted predatory dinosaur from Africa and the evolution of spinosaurids". Science. 282 (5392): 1298–1302. Bibcode:1998Sci...282.1298S. doi:10.1126/science.282.5392.1298. PMID 9812890. Retrieved 2013-03-19.
  46. ^ Mateus, O.; Araújo, R.; Natário, C.; Castanhinha, R. (2011). "A new specimen of the theropod dinosaur Baryonyx from the early Cretaceous of Portugal and taxonomic validity of Suchosaurus" (PDF). Zootaxa. 2827: 54–68.
  47. ^ Alonso, Antonio, and José Ignacio Canudo. 2016. “On the Spinosaurid Theropod Teeth from the Early Barremian (Early Cretaceous) Blesa Formation (Spain).” Historical Biology 28 (6): 823–34. doi:10.1080/08912963.2015.1036751.
  48. ^ "Australian 'Spinosaur' unearthed". Australian Geographic. Retrieved 2018-04-15.
  49. ^ Barrett, P. M.; Benson, R. B. J.; Rich, T. H.; Vickers-Rich, P. (2011). "First spinosaurid dinosaur from Australia and the cosmopolitanism of Cretaceous dinosaur faunas". Biology Letters. 7 (6): 933–936. doi:10.1098/rsbl.2011.0466. ISSN 1744-9561.
  50. ^ a b Cite error: The named reference Serenoetal.1998 was invoked but never defined (see the help page).
  51. ^ a b c d Rayfield, Emily J. 2011. “Structural Performance of Tetanuran Theropod Skulls, with Emphasis on the Megalosauridae, Spinosauridae and Carcharodontosauridae.” Special Papers in Palaeontology 86 (November). https://www.researchgate.net/publication/250916680_Structural_performance_of_tetanuran_theropod_skulls_with_emphasis_on_the_Megalosauridae_Spinosauridae_and_Carcharodontosauridae.
  52. ^ a b Sales, M.A.F.; Schultz, C.L. (2017). "Spinosaur taxonomy and evolution of craniodental features: Evidence from Brazil". PLoS ONE. 12 (11): e0187070. doi:10.1371/journal.pone.0187070.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  53. ^ Allain, R.; Xaisanavong, T.; Richir, P.; Khentavong, B. (2012). "The first definitive Asian spinosaurid (Dinosauria: Theropoda) from the early cretaceous of Laos". Naturwissenschaften. 99 (5): 369–377. Bibcode:2012NW.....99..369A. doi:10.1007/s00114-012-0911-7. PMID 22528021.
  54. ^ a b c Sues, Hans-Dieter, Eberhard Frey, David M. Martill, and Diane M. Scott. 2002. “Irritator Challengeri, a Spinosaurid (Dinosauria: Theropoda) from the Lower Cretaceous of Brazil.” Journal of Vertebrate Paleontology 22 (3): 535–47. doi:10.1671/0272-4634(2002)022[0535:ICASDT]2.0.CO;2.
  55. ^ a b Vullo, R.; Allain, R.; Cavin, L. (2016). "Convergent evolution of jaws between spinosaurid dinosaurs and pike conger eels". Acta Palaeontologica Polonica. 61. doi:10.4202/app.00284.2016.
  56. ^ a b Rayfield, Emily J., Angela C. Milner, Viet Bui Xuan, and Philippe G. Young. 2007. “Functional Morphology of Spinosaur ‘crocodile-Mimic’ Dinosaurs.” Journal of Vertebrate Paleontology 27 (4): 892–901. doi:10.1671/0272-4634(2007)27[892:FMOSCD]2.0.CO;2.
  57. ^ a b c Cuff, Andrew R., and Emily J. Rayfield. 2013. “Feeding Mechanics in Spinosaurid Theropods and Extant Crocodilians.” PLOS ONE 8 (5): e65295. doi:10.1371/journal.pone.0065295.
  58. ^ Smith, J. B. (2001-06-01). "A Giant Sauropod Dinosaur from an Upper Cretaceous Mangrove Deposit in Egypt". Science. 292 (5522): 1704–1706. doi:10.1126/science.1060561. ISSN 0036-8075.
  59. ^ a b c "The Cretaceous (Cenomanian) continental record of the Laje do Coringa flagstone (Alcântara Formation), northeastern South America". Journal of South American Earth Sciences. 53: 50–58. 2014-08-01. doi:10.1016/j.jsames.2014.04.002. ISSN 0895-9811.
  60. ^ "Middle Cretaceous dinosaur assemblages from northern Brazil and northern Africa and their implications for northern Gondwanan composition". Journal of South American Earth Sciences. 61: 147–153. 2015-08-01. doi:10.1016/j.jsames.2014.10.005. ISSN 0895-9811.
  61. ^ a b Cite error: The named reference :4 was invoked but never defined (see the help page).
  62. ^ Ibrahim, N.; Sereno, P. C.; Dal Sasso, C.; Maganuco, S.; Fabbri, M.; Martill, D. M.; Zouhri, S.; Myhrvold, N.; Iurino, D. A. (2014). "Semiaquatic adaptations in a giant predatory dinosaur". Science. 345 (6204): 1613–1616. doi:10.1126/science.1258750. PMID 25213375.
  63. ^ Charig, A. J.; Milner, A. C. (1997). "Baryonyx walkeri, a fish-eating dinosaur from the Wealden of Surrey". Bulletin of the Natural History Museum of London. 53: 11–70.

External links[edit]

My wish is for this to become reality, let's do it!

edit | discuss
Spinosauridae
12 articles
Spinosaurus
Suchomimus
Baryonyx
Irritator
Ichthyovenator
Oxalaia
Sigilmassasaurus
Cristatusaurus
Siamosaurus
"Sinopliosaurus" fusuiensis
Ostafrikasaurus
Suchosaurus
Retrieved from "https://en.wikipedia.org/w/index.php?title=User:PaleoGeekSquared/sandbox2&oldid=1174667827"