Herrerasauridae

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Herrerasauridae
Temporal range: Late Triassic, 231.4–225 Ma
Skeleton of a carnivorous dinosaur, with open jaws and sharp teeth prominently in the foreground.
Mounted Herrerasaurus ischigualastensis skeleton cast, at the Field Museum in Chicago
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Dinosauria
Order: Saurischia
Family: Herrerasauridae
Reig, 1963
Genera[1]
Synonyms
  • Staurikosauridae Galton, 1977

Herrerasaurids are among the oldest known dinosaurs, appearing in the fossil record 231.4 million years ago (Late Triassic). These dinosaurs became extinct by the end of the Triassic period. Herrerasaurids were small-sized (not more than 4 metres (13 ft) long) carnivorous basal saurischians.[2][3] The best known representatives of this group are from South America (Brazil, Argentina), where they were first discovered in the 1960s. A nearly complete skeleton of Herrerasaurus ischigulastensis was discovered in the Ischigualasto Formation in San Juan, Argentina, in 1988. Less complete herrerasaurids have been found in North America, and they may have inhabited other continents as well.

Herrerasaurid anatomy is unusual and specialized, and they are not considered to be ancestral to any later dinosaur group. They only superficially resemble theropods and often present a mixture of very primitive and derived traits. The acetabulum is only partly open, and there are only two sacral vertebrae, the lowest number among dinosaurs. The pubic bone has a derived structure, being rotated somewhat posteriorly and folded to create a superficially tetanuran-like terminal expansion, especially prominent in H. ischigulastensis. The hand is primitive in having five metacarpals and the third finger longer than the second, but clearly theropod in having only three long fingers, with curved claws. Herrerasaurids also have a hinged mandible, which is also found in theropods.

Classification[edit]

It is not clear where Herrerasaurids lie on the early dinosaur evolutionary tree. They are possibly basal theropods or basal saurischians but may predate the saurischian-ornithischian split.[4] Early researchers even proposed that they represented an early lineage of sauropodomorphs. Some analyses, such as Nesbitt et al. 2009, have found Herrerasaurus and its relatives in Herrerasauridae to be very basal theropods,[5] while others (such as Ezcurra 2010) have found them to be basal to the clade Eusaurischia, that is, closer to the base of the saurischian tree than either theropods or sauropodomorphs, but not true members of either.[6] The situation is further complicated by uncertainties in correlating the ages of late Triassic beds bearing land animals.[2]

Other proposed members of the clade have included Sanjuansaurus[7] from the Ischigualasto Formation of Argentina, Staurikosaurus from the Santa Maria Formation of southern Brazil,[8] Chindesaurus from the Petrified Forest (Chinle Formation) of Arizona,[9] and possibly Caseosaurus from the Dockum Formation of Texas,[10] although the relationships of these animals are not fully understood, and not all paleontologists agree. Grzegorz Niedźwiedzki, Stephen L. Brusatte et al. (2014) described a European member of the group on the basis of Norian age fossils discovered in Poland.[11] Other possible basal saurischians include Alwalkeria from the Late Triassic Maleri Formation of southern India,[12] and Teyuwasu, known from very fragmentary remains from the Late Triassic of Brazil.[13]

Phylogeny[edit]

Fernando Novas (1992) defined Herrerasauridae as Herrerasaurus, Staurikosaurus, and their most recent common ancestor.[14] Paul Sereno (1998) defined the group as the most inclusive clade including H. ischigualastensis but not Passer domesticus.[15] Langer (2004) provided first phylogenetic definition of a higher level taxon, Herrerasauria, as Herrerasaurus but not Liliensternus or Plateosaurus.[2] According to current phylogenetic studies, all of these definitions describe the same clade.

The first cladogram presented follows one proposed analysis by Fernando E. Novas, Martin D. Ezcurra, Sankar Chatterjee and T. S. Kutty in May 2011. In this review, Herrerasaurus is a basal saurischian, but not a theropod.[16] The second cladogram is based on an analysis by Hans-Dieter Sues, Sterling J. Nesbitt, David S. Berman and Amy C. Henrici in April 2011. This review classified Herrerasaurus as a basal theropod.[17]


  Dinosauria  

Ornithischia


 Saurischia 
 Herrerasauridae 

Herrerasaurus



Staurikosaurus



Unnamed herrerasaurid



 Eusaurischia 
 Theropoda 

Chindesaurus




Tawa




Eoraptor



Neotheropoda






Sauropodomorpha






  Dinosauria  

Ornithischia


 Saurischia 

Sauropodomorpha


 Theropoda 
 Herrerasauridae 

Staurikosaurus




Herrerasaurus



Chindesaurus






Eoraptor




Daemonosaurus




Tawa



Neotheropoda









A large phylogenetic analysis of early dinosaurs by Matthew Baron, David Norman and Paul Barrett (2017) found Herrerasauridae within the clade Saurischia, as the sister group to Sauropodomorpha. This was the result of the removal of Theropoda from Saurischia and its placement next to Ornithischia within the newly created clade Ornithoscelida.[18]


  Dinosauria  
 Saurischia 
 Herrerasauridae 

Staurikosaurus




Herrerasaurus




Chindesaurus



Sanjuansaurus






Sauropodomorpha



 Ornithoscelida 

Ornithischia


 Theropoda 

Eoraptor




Tawa




Eodromaeus




Liliensternus



Neotheropoda









References[edit]

  1. ^ Holtz, Thomas R. Jr. (2012). "Winter 2011 Appendix" (PDF). Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages. 
  2. ^ a b c Langer, Max C. (2004). "Basal Saurischia". In Weishampel, David B.; Dodson, Peter; Osmólska, Halszka. The Dinosauria (2nd ed.). Berkeley: University of California Press. pp. 25–46. ISBN 0-520-24209-2. OCLC 55000644. OL 3305845M. 
  3. ^ Langer, Max C; Benton, Michael J. (2006). "Early dinosaurs: a phylogenetic study". Journal of Systematic Palaeontology. 4 (4): 309–358. doi:10.1017/S1477201906001970. 
  4. ^ Brinkman, Donald B.; Sues, Hans-Dieter (1987). "A staurikosaurid dinosaur from the Upper Triassic Ischigualasto Formation of Argentina and the relationships of the Staurikosauridae". Palaeontology. 30: 493–503. 
  5. ^ Nesbitt, Sterling J.; Smith, Nathan D.; Irmis, Randall B.; Turner, Alan H.; Downs, Alex & Norell, Mark A. (2009). "A complete skeleton of a Late Triassic saurischian and the early evolution of dinosaurs". Science. 326 (5959): 1530–1533. doi:10.1126/science.1180350. PMID 20007898. 
  6. ^ Ezcurra, Martin D. (2010). "A new early dinosaur (Saurischia: Sauropodomorpha) from the Late Triassic of Argentina: a reassessment of dinosaur origin and phylogeny". Journal of Systematic Palaeontology. 8 (3): 371–425. doi:10.1080/14772019.2010.484650. 
  7. ^ Alcober, Oscar A.; Martinez, Ricardo N. (2010). "A new herrerasaurid (Dinosauria, Saurischia) from the Upper Triassic Ischigualasto Formation of northwestern Argentina". ZooKeys. 63 (63): 55–81. doi:10.3897/zookeys.63.550. PMC 3088398Freely accessible. PMID 21594020. 
  8. ^ Colbert, E.H. (1970). "A saurischian dinosaur from the Triassic of Brazil". American Museum Novitates. 2405: 1–39. 
  9. ^ Long, R. A.; Murry, P. A. (1995). "Late Triassic (Carnian and Norian) Tetrapods from the Southwestern United States". Bulletin. New Mexico Museum of Natural History and Science. 4: 1–254. 
  10. ^ Hunt, Adrian P.; Lucas, Spencer G.; Heckert, Andrew B.; Sullivan, Robert M.; Lockley, Martin G. (1998). "Late Triassic Dinosaurs from the Western United States". Geobios. 31 (4): 511–531. doi:10.1016/S0016-6995(98)80123-X. 
  11. ^ Niedźwiedzki, Grzegorz; Brusatte, Stephen L.; Sulej, Tomasz; Butler, Richard J. (2014). "Basal dinosauriform and theropod dinosaurs from the mid–late Norian (Late Triassic) of Poland: implications for Triassic dinosaur evolution and distribution". Palaeontology. in press. doi:10.1111/pala.12107. 
  12. ^ Chatterjee, Sankar; Creisler, Benjamin S. (1994). "Alwalkeria (Theropoda) and Morturneria (Plesiosauria), new names for preoccupied Walkeria Chatterjee, 1987 and Turneria Chatterjee and Small, 1989". Journal of Vertebrate Paleontology. 14 (1): 142. doi:10.1080/02724634.1994.10011546. 
  13. ^ Kischlat, E.-E. (1999). "A new dinosaurian "rescued" from the Brazilian Triassic: Teyuwasu barberenai, new taxon". Paleontologia em Destaque, Boletim Informativo da Sociedade Brasileira de Paleontologia. 14 (26): 58. 
  14. ^ Novas, F. E. (1992). "Phylogenetic relationships of the basal dinosaurs, the Herrerasauridae". Palaeontology. 35: 51–62. 
  15. ^ Sereno, P. C. (1998). "A rationale for phylogenetic definitions, with application to the higher-level taxonomy of Dinosauria". Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 210 (1): 41–83. 
  16. ^ Novas, Fernando E.; Ezcurra, Martin D.; Chatterjee, Sankar; Kutty, T. S. (2011). "New dinosaur species from the Upper Triassic Upper Maleri and Lower Dharmaram formations of central India". Earth and Environmental Science Transactions of the Royal Society of Edinburgh. 101 (3–4): 333–349. doi:10.1017/S1755691011020093. 
  17. ^ Sues, Hans-Dieter; Nesbitt, Sterling J.; Berman, David S.; Henrici, Amy C. (2011). "A late-surviving basal theropod dinosaur from the latest Triassic of North America". Proceedings of the Royal Society B. 278 (1723): 3459–64. doi:10.1098/rspb.2011.0410. PMC 3177637Freely accessible. PMID 21490016. 
  18. ^ Baron, M.G., Norman, D.B., and Barrett, P.M. (2017). A new hypothesis of dinosaur relationships and early dinosaur evolution. Nature, 543: 501–506. doi:10.1038/nature21700