|
|||||
|
|
The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia) |
|
| Authors: | Emily Keeble David I Whiteside Michael J Benton |
| Institution: | School of Earth Sciences, University of Bristol, Bristol, BS8 1RJ, UK |
| Abstract: | Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco. |
| Keywords: | BRSUG Geological Museum University of Bristol NHMUK Natural History Museum London ac acrodont ad adductor add additional ant anterior art articular bo bony c crest cap capitellum car carpal cen centrum cn cnemial col column con condyle cor coronoid de deltopectoral dent dentary dist distal dor dorsal ect ectopterygoid ed edentulous en enamel ent entepicondylar er erupting fct facet fib fibular fl flange for foramen fos fossa gl glenoid gr groove hat hatchling hd head hy hyoid in inner int-tr inter-trochanteric jug jugal l left lab labial lin lingual max maxilla me medial meck Meckelian na nasal not notch pal palatine par parietal pl pleurodont pm premaxilla po postorbital prf prefrontal proc process post posterior pozy postzygapophysis prf prefrontal proc process prox proximal pt pterygoid r right rad radius ret-art retroarticular rid ridge(d) re resorption reg region scpco scapulocoracoid st sternum sut suture sym symphysis (symphyseal) th tooth (teeth) tr trochanter ve vertebra(l) Late Triassic Systematics Rhynchocephalian Sauropodomorph Crocodylomorph |
| 本文献已被 ScienceDirect 等数据库收录！ | |