Anurognathidae

Anurognathids
Temporal range: Middle Jurassic - Late Jurassic, 164–157 Ma
Life restoration of Anurognathus ammoni
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Order: †Pterosauria
Clade: †Caelidracones
Family: †Anurognathidae
Nopcsa, 1928
Type species
Anurognathus ammoni
Döderlein, 1923
Subgroups

The Anurognathidae were a group of small pterosaurs, with short tails or tailless, that lived in Europe, Asia, and possibly North America during the Jurassic period. Four genera are known: Anurognathus, from the Late Jurassic of Germany, Jeholopterus, from the Middle to Late Jurassic of China,[1] Dendrorhynchoides, from the Middle Jurassic[2] of China, and Batrachognathus, from the Late Jurassic of Kazakhstan. Bennett (2007) claimed that the holotype of Mesadactylus, BYU 2024, a synsacrum, belonged to an anurognathid.[3] Mesadactylus is from the Late Jurassic Morrison Formation of the USA. Indeterminate anurognathid remains have also been reported from the Middle Jurassic Bakhar Svita of Mongolia.[4][5]

Classification

Anurognathid skeletons to scale

A family Anurognathidae was named in 1928 by Franz Nopcsa von Felső-Szilvás (as the subfamily Anurognathinae) with Anurognathus as the type genus. The family name Anurognathidae was first used by Oskar Kuhn in 1967. Both Alexander Kellner and David Unwin in 2003 defined the group as a node clade: the last common ancestor of Anurognathus and Batrachognathus and all its descendants.

The phylogeny of the Anurognathidae is uncertain. Some analyses, as those of Kellner, place them very basal in the pterosaur tree. However, they do have some characteristics in common with the derived Pterodactyloidea, such as the short and fused tail bones. In 2010 an analysis by Brian Andres indicated the Anurognathidae and the Pterodactyloidea were sister taxa. This conforms better to the fossil record because no early anurognathids are known and would require a ghost lineage of over sixty million years.[6]

Notes

  1. ↑ Gao, K. -Q.; Shubin, N. H. (2012). "Late Jurassic salamandroid from western Liaoning, China". Proceedings of the National Academy of Sciences 109 (15): 5767–72. doi:10.1073/pnas.1009828109. PMC 3326464. PMID 22411790.
  2. ↑ Lü Junchang and David W.E. Hone (2012). "A New Chinese Anurognathid Pterosaur and the Evolution of Pterosaurian Tail Lengths". Acta Geologica Sinica 86 (6): 1317–1325. doi:10.1111/1755-6724.12002.
  3. ↑ Bennett, S. C. (2007). "Reassessment of Utahdactylus from the Jurassic Morrison Formation of Utah". Journal of Vertebrate Paleontology 27(1): 257–260
  4. ↑ Unwin, D. M. & Bakhurina, N. N. (2000): Pterosaurs from Russia, Middle Asia and Mongolia. – In: M. J. Benton, M. A. Shishkin, D. M. Unwin & E. N. Kurochin (Eds), The age of dinosaurs in Russia and Mongolia; Cambridge (Cambridge University Press), 420–433.
  5. ↑ Barrett, P.M., Butler, R.J., Edwards, N.P., & Milner, A.R. Pterosaur distribution in time and space: an atlas. p61-107. in Flugsaurier: Pterosaur papers in honour of Peter Wellnhofer. 2008. Hone, D.W.E., and Buffetaut, E. (eds). Zitteliana B, 28. 264pp.
  6. ↑ Brian Andres; James M. Clark & Xu Xing (2010). "A new rhamphorhynchid pterosaur from the Upper Jurassic of Xinjiang, China, and the phylogenetic relationships of basal pterosaurs", Journal of Vertebrate Paleontology, Volume 30, Issue 1 January 2010 , pages 163 - 187


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