The holotype specimen (NHMUK PV R 1336) was first and last described by Owen, 1840. ‘Plesiosaurus’ macrocephalus is probably a juvenile rhomaleosaurid, and certainly doesn’t belong to the genus Plesiosaurus. However, pending revision of the taxon and referral to a different or other existing genus, it is still named ‘Plesiosaurus‘, following Owen.
Avalonnectes arturi is the type and only species of Avalonnectes.
R. thorntoni was first described briefly by Andrews (1922a). Smith and Benson (2014) described and figured R. thorntoni in detail in a monograph on the holotype specimen.
Mike Taylor studied the holotype of R. zetlandicus for his Ph.D. thesis and subsequently published a description of the cranial anatomy (Taylor, 1992). Vincent and Smith (2010) referred the holotype of R. propinquus to R. zetlandicus
The history of NMING F8785 (The holotype specimen of R. cramptoni) In 1848, the fossil skeleton of R. cramptoni was unearthed by workers in an alum quarry at Kettleness on the Yorkshire coast. The magnificent fossil was secured for five years at Mulgrave Castle, the home of the Marquis of Normanby, owner of the quarry. …