Ichthyosauria from the Upper Lias of Strawberry Bank, England
作者： HANNAH CAINE , MICHAEL J. BENTON
DOI: 10.1111/J.1475-4983.2011.01093.X
关键词:
摘要: Eight remarkably preserved specimens of ichthy- osaurs from the lower Toarcian (Lower Jurassic) Straw- berry Bank (Ilminster, Somerset, England) are described fully for first time. Whereas previously these ichthyo- saurs were assigned to one species, Stenopterygius hauffianus, our study shows there two, triscissus and Hauffiopteryx typicus. S. is a small- medium- sized ichthyosaur up 3.5 m long, characterised by three apomorphies: long slender rostrum, large elliptical su- pratemporal fenestra bipartite pelvis. H. typicus small 2.95 with five apomor- phies: short extremely very orbit, rounded supratemporal tripartite pelvis, which fused distally. Cladistic analysis equivocal about their relationships, suggesting either that perhaps also members clade Eurhin- osauria or this does not exist, both genera wider Thunnosauria. Further, Stenopterygiidae, in had been located, identified. Most striking speci- mens all juveniles (five specimens) infants (three specimens), ranging one-tenth one-half normal adult length species.
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