. Bulletin of the British Museum (Natural History), Geology. THE PTERODACTYLOIDS FROM THE PURBECK LIMESTONE FORMATION OF DORSET 81 Fig. 5 Plataleorhynchus streptophorodon gen. et sp. nov. BMNH R. 11957, spatula of rostrum in palatal aspect (interpretive drawing). Abbreviations: al. = alveolus; = dental foramen; = vascular foramen. Scale = 10 mm. Darallel, elongate, horn-like prezygapophyses, the left one of which is preserved. It bears an ovoid articular facet. The jostzygapophyses, represented by a worn left structure, were )road blunt processes each bearing a distinct t
. Bulletin of the British Museum (Natural History), Geology. THE PTERODACTYLOIDS FROM THE PURBECK LIMESTONE FORMATION OF DORSET 81 Fig. 5 Plataleorhynchus streptophorodon gen. et sp. nov. BMNH R. 11957, spatula of rostrum in palatal aspect (interpretive drawing). Abbreviations: al. = alveolus; = dental foramen; = vascular foramen. Scale = 10 mm. Darallel, elongate, horn-like prezygapophyses, the left one of which is preserved. It bears an ovoid articular facet. The jostzygapophyses, represented by a worn left structure, were )road blunt processes each bearing a distinct tubercle. The leural spine is a low slender ridge of bone running the full ength of the vertebra. Fracturing at both ends suggests that it nay have been slightly more raised in these regions. BMNH 48387 (Fig. 7) is a second, incomplete, cervical 'ertebra which is part of the Beckles Collection, purchased in 877. It is recorded merely as having been collected from the Middle Purbeck Beds' of Durlston Bay. It is a fragment omprising the posterior end of a flattened and elongate ervical vertebra similar to the above specimen. Like SMC 5340, it has a low neural spine and bears a pair of postexapo- â hyses which bracket the posterior condyle. These elongate cervical vertebrae clearly do not belong to n ornithocheirid, a gallodactylid or some pterodactylids. uch vertebrae are found in the Ctenochasmatidae, the vzhdarchidae and some species of Pterodactylus, including antiquus and P. longicollum (the latter two possibly synonymous according to Bennett (1993)). In recent work SMC J5340 has been treated as a fragment of a possible early azhdarchid pterodactyloid (Howse 1986, Wellnhofer 1991a). However, now that it has been established that two suitably large ctenochasmatids, Plataleorhynchus and Gnathosaurus, are present in the Purbeck Limestone Formation, the system- atic position of this cervical must be reconsidered. The larger ctenochasmatid Huanhepterus has cervicals of similar siz
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