References
Reference
Cruickshank, Arthur R I (1996) The cranial anatomy of <i>Rhomaleosaurus thornton</i>i Andrews (Reptilia, Plesiosauria); Bulletin of the British Museum (Natural History), Geology, 52(2), pp.109-114
The cranial anatomy of Rhomaleosaurus thorntoni Andrews (Reptilia, Plesiosauria)
Principal Author
Arthur R I Cruickshank
Header
Academic paper
Journal
Bulletin of the British Museum (Natural History), Geology
Publisher
The Natural History Museum
Volume
52
Issue
2
Pages
109-114
Abstract
The skull and lower jaw of Rhomaleosaurus thorntoni Andrews, 1922, from the Upper Lias of Northamptonshire, are figured for the first time. New information shows that the external nares are in a perfectly normal position, just in front of the orbits. There is little difference between R. thorntoni, R. zetlandicus and R. cramptoni, the type species of the genus. As they can be considered to be conspecific, Rhomaleosaurus zetlandicus (Phillips, in Anon, 1854) has priority. R. zetlandicus is of more robust construction than the Rhaetian/Hettangian species R. megacephalus (Stutchbury, 1846), with, among other differences, teeth having fewer striae and the internal nares of a different construction
Language
English