Rhamphocephalus
Rhamphocephalus ("beak head") is an extinct genus of fossil reptile from the Middle Jurassic (Bathonian stage) Great Oolite Group of Gloucestershire, England. The name was erected as a genus of pterosaur and became a 'wastebasket taxon' for British Jurassic pterosaur remains until a recent revision. "Rhamphocephalus" comprises several named species, two of which are pterosaurian, but the type species - "R. prestwichi" - is based on remains now identified as a thalattosuchian. Because it is poorly preserved and lacks features that distinguish it from other thalattosuchians, "R. prestwichi" is considered an invalid species and the genus "Rhamphocephalus" is a nomen dubium . Reassessments of other "Rhamphocephalus" species suggest they are also undiagnostic to species level, although they have properties allowing referral to some Jurassic pterosaur groups. 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. 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. Misassigned species. "Pterodactylus bucklandii" von Meyer, 1832 and "Rhamphorhynchus depressirostris" Huxley, 1859, 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. Rhamphocephalus