Rhamphocephalus

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Rhamphocephalus
Temporal range: Middle Jurassic Bathonian
Rhamphocephalus prestwichi.jpg
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Order: Crocodyliformes
Suborder: Thalattosuchia
Genus: Rhamphocephalus
Seeley, 1880
Species

Rhamphocephalus prestwichi
Seeley, 1880 (type)

Rhamphocephalus ("beak head") is an extinct genus of thalattosuchian from the Middle Jurassic (Bathonian) Great Oolite Group of Gloucestershire, England.

Taxonomy

The type species, R. prestwichi, is known from the skull roof fragment OUM J.28266, found the Kineton Thorns Quarry, Stow-On-Wold, Gloucestershire. Seeley (1880) noted that the cranial bones of Rhamphocephalus are arranged more like that of a crocodyliform rather than a pterosaur.[1] Although assigned to Pterosauria by previous authors, in their review of pterosaur remains from the Great Oolite group, O'Sullivan and Martill (2018) demonstrated that Rhamphocephalus belongs to Thalattosuchia rather than Pterosauria due to differences with pterosaurs in the cranial bone arrangement. They also argued that the specimen lacked good autapomorphoes and the genus was a nomen dubium.[2]

Misassigned species

Pterodactylus bucklandii von Meyer, 1832[3] and Rhamphorhynchus depressirostris Huxley, 1859,[4] both based on jaw material, were previously assigned to Rhamphocephalus, along with the nominal species Pterodactylus aclandi, P. duncani, and P. kiddi, which are based on phalangeal remains. However, the thalattosuchian reclassification of Rhamphocephalus rendered this referral untenable, although bucklandii and depressirostris were clearly pterosaurian, and P. bucklandii was assigned to Rhamphorhychinae indeterminate, while Rhamphorhynchus depressirostris was assigned to ?Scaphognathinae indeterminate.[2]

See also

References

  1. ^ Seeley H.G. 1880. On Rhamphocephalus prestwichi Seeley, an Ornithosaurian from the Stonesfield Slate of Kineton. Quart. J. Geol. Soc. 36: 27-30
  2. ^ a b 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.
  3. ^ H. v. Meyer. 1832. Palaeologica zur Geschichte der Erde und ihrer Geschöpfe; Verlag von Siegmund Schmerber, Frankfurt am Main 1-560
  4. ^ T. H. Huxley. 1859. On Rhamphorhynchus bucklandi a new pterosaurian from the Stonesfield Slate. Quarterly Journal of the Geological Society of London 15:658-670.
  • Rhamphocephalus in the Paleobiology Database.


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