Pterodactyloidea

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Pterodactyloids
Temporal range:
Late Jurassic - Late Cretaceous, 162.7–66 Ma
Pterodactylus antiquus - IMG 0681.jpg
Cast of a Pterodactylus antiquus specimen, Carnegie Museum of Natural History
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Order: Pterosauria
Clade: Caelidracones
Suborder: Pterodactyloidea
Plieninger, 1901
Subgroups
Synonyms

Dracochira Haeckel, 1895

Pterodactyloidea (derived from the Greek words πτερόν (pterón, for usual ptéryx) "wing", and δάκτυλος (dáctylos) "finger" meaning "winged finger", "wing-finger" or "finger-wing") is one of the two traditional suborders of pterosaurs ("wing lizards"), and contains the most derived members of this group of flying reptiles. They appeared during the middle Jurassic Period, and differ from the basal (though paraphyletic) rhamphorhynchoids by their short tails and long wing metacarpals (hand bones). The most advanced forms also lack teeth, and by the late Cretaceous, all known pterodactyloids were toothless.[1] Many species had well developed crests on the skull, a form of display taken to extremes in giant-crested forms like Nyctosaurus and Tupandactylus. Pterodactyloids (specifically the family Azhdarchidae) were the last surviving pterosaurs when the order became extinct at the end of the Cretaceous Period, together with the non-avian dinosaurs and most marine reptiles.

"Pterodactyl" is also a common term for pterodactyloid pterosaurs, though it can also be used to refer to Pterodactylus specifically or (incorrectly) to pterosaurs in general. Well-known examples of pterodactyloids include Pterodactylus, Dsungaripterus, Pteranodon, and Quetzalcoatlus.

In 2014, fossils from the Shishugou Formation of China were classified as the most basal pterodactyloid yet found, Kryptodrakon. At a minimum age of about 161 my, it is about 5 million years older than the oldest previously known confirmed specimens.[2] Previously, a fossil jaw recovered from the Middle Jurassic Stonesfield Slate formation in the United Kingdom, was considered the oldest known. This specimen supposedly represented a member of the family Ctenochasmatidae,[3] though further examination suggested it belonged to a teleosaurid stem-crocodilian instead of a pterosaur.[2] O'Sullivan and Martill (2018) described a partial synsacrum from the Stonesfield Slate identified as possibly pterodactyloid based on the number of incorporated sacrals although they commented that the morphology was perhaps closer to that of wukongopterids. If correctly identified, it would be the oldest pterodactyloid fossil known.[4]

Classification[edit]

Pterodactyloidea is traditionally considered to be the group of short-tailed pterosaurs with long wrists (metacarpus), compared with the relatively long tails and short wrist bones of basal pterosaurs ("rhamphorhynchoids"). In 2004, Kevin Padian formally defined Pterodactyloidea as an apomorphy-based clade containing those species possessing a metacarpal at least 80% of the length of the humerus, homologous with that of Pterodactylus.

A subgroup of pterodactyloids, called the Lophocratia, was named by David Unwin in 2003. Unwin defined the group as the most recent common ancestor of Pterodaustro guinazui and Quetzalcoatlus northropi, and all its descendants.[5] This group was named for the presence of a head crest in most known species, though this feature has since been found in more primitive pterosaurs and was probably an ancestral feature for all pterodactyloids.[6]

There are competing theories of pterodactyloid phylogeny. Below is a cladogram showing the results of a phylogenetic analysis presented by Longrich, Martill, and Andres, 2018. This study found the two traditional groupings of ctenochasmatoids and kin as an early branching group, with all other pterodactyloids grouped into the Eupterodactyloidea.[7]

 Caelidracones 

AnurognathidaeAnurognathusDB white background.jpg

 Pterodactyloidea 

KryptodrakonKryptodrakon.jpeg

Lophocratia
Archaeopterodactyloidea 

GermanodactylidaeAltmuehlopterus DB.jpg

 Euctenochasmatia 

PterodactylusPterodactylus BMMS7 life.png

 Ctenochasmatoidea 

Gallodactylidae

Ctenochasmatidae Pterodaustro BW.jpg

Eupterodactyloidea 

Haopterus

Ornithocheiroidea

Piksi

 Pteranodontoidea 
Ornithocheiromorpha

Hongshanopterus

Boreopteridae

Lanceodontia

Istiodactylidae

AnhangueriaLiaoningopterusDB flipped.jpg

Pteranodontia

NyctosauridaeNyctosaurus DB white background.jpg

PteranodontidaePteranodon longiceps mmartyniuk wiki.png

 Azhdarchoidea 
Tapejaromorpha

Bennettazhia

Tapejaridae

BakonydracoBakonydraco1DB.jpg

"Huaxiapterus" benxiensis

"Huaxiapterus" corollatus

Eopteranodon

Huaxiapterus

Sinopterus

Tapejarinae TapimpDB.jpg

 Neoazhdarchia 
Dsungaripteromorpha

ThalassodrominaeTupux longDB2.jpg

Dsungaripteridae

Neopterodactyloidea

Chaoyangopteridae

AzhdarchidaeQuetzalcoatlus07.jpg

Some studies based on a different type of analysis have found that this basic division into primitive (archaeopterodactyloid) and advanced (eupterodactyloid) species may not be correct. Beginning in 2014, Steven Vidovic and David Martill constructed an analysis in which several pterosaurs traditionally thought of as archaeopterodactyloids closely related to the ctenochasmatoids may have been more closely related to ornithocheiroids, or in some cases, fall outside both groups. The results of their updated 2017 analysis are shown below.[8]

Pterodactyloidea

Eosipterus yangi

Pterodactylus antiquusPterodactylus BMMS7 life.png

Lophocratia

Diopecephalus kochi

Ctenochasmatoidea
Gallodactylidae

Aerodactylus scolopacicepsAerodactylus MCZ 1505.png

Aurorazhdarchidae

Gallodactylidae

Ctenochasmatidae

Altmuehlopterus ramphastinusAltmuehlopterus DB.jpg

Dsungaripteroidea

Germanodactylus cristatus

Elanodactylus prolatus

Ornithocheiroidea
Dsungaripteromorpha

Lonchodectes compressirostris

Prejanopterus curvirostra

Kepodactylus insperatus

Dsungaripteridae

Pteranodontoidea

OrnithocheiromorphaLiaoningopterusDB flipped.jpg

Hamipterus tianshanensis

Ikrandraco avatar

Istiodactylus

Pteranodontia

NyctosauridaeNyctosaurus DB white background.jpg

PteranodonPteranodon longiceps mmartyniuk wiki.png

Azhdarchoidea

Sinopterus dongi

Tapejarinae

Eoazhdarcho liaoxiensis

Neoazhdarchia

TapejaromorphaBakonydraco1DB.jpg

Bennettazhia oregonensis

Huaxiapterus jii

Thalassodromeus sethi

Tupuxuara leonardiiTupux longDB2.jpg

AzhdarchidaeQuetzalcoatlus07.jpg

References[edit]

  1. ^ Review of taxonomy, geographic distribution, and paleoenvironments of Azhdarchidae (Pterosauria) - ZooKeys
  2. ^ a b Andres, B.; Clark, J.; Xu, X. (2014). "The Earliest Pterodactyloid and the Origin of the Group". Current Biology. 24 (9): 1011–6. doi:10.1016/j.cub.2014.03.030. PMID 24768054.
  3. ^ Buffetaut, E. and Jeffrey, P. (2012). "A ctenochasmatid pterosaur from the Stonesfield Slate (Bathonian, Middle Jurassic) of Oxfordshire, England." Geological Magazine, (advance online publication) doi:10.1017/S0016756811001154
  4. ^ Michael O’Sullivan; David M. Martill (2018). "Pterosauria of the Great Oolite Group (Bathonian, Middle Jurassic) of Oxfordshire and Gloucestershire, England". Acta Palaeontologica Polonica. Online edition. doi:10.4202/app.00490.2018.
  5. ^ Unwin, D. M., (2003). "On the phylogeny and evolutionary history of pterosaurs." Pp. 139-190. in Buffetaut, E. & Mazin, J.-M., (eds.) (2003). Evolution and Palaeobiology of Pterosaurs. Geological Society of London, Special Publications 217, London, 1-347.
  6. ^ Witton, Mark (2013). Pterosaurs: Natural History, Evolution, Anatomy. Princeton University Press. ISBN 978-0691150611.
  7. ^ Longrich, N.R., Martill, D.M., and Andres, B. (2018). Late Maastrichtian pterosaurs from North Africa and mass extinction of Pterosauria at the Cretaceous-Paleogene boundary. PLoS Biology, 16(3): e2001663. doi:10.1371/journal.pbio.2001663
  8. ^ Vidovic, S.U. and Martill, D.M. (2017). The taxonomy and phylogeny of Diopecephalus kochi (Wagner, 1837) and "Germanodactylus rhamphastinus" (Wagner, 1851). In Hone, D. W. E., Witton, M. P. &Martill, D. M. (eds) New Perspectives on Pterosaur Palaeobiology. Geological Society, London, Special Publications, 455 doi:10.1144/SP455.12