The diversity of Triassic South American sphenodontians: a new basal form, clevosaurs, and a revision of rhynchocephalian phylogeny

Chambi-Trowell Sofia A. V.; Martinelli Agustin G.; Whiteside David I.Vivar Paulo R. Romo deSoares Marina BentoSchultz Cesar L.Gill Pamela G.Benton Michael J.Rayfield Emily J.

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The diversity of Triassic South American sphenodontians: a new basal form, clevosaurs, and a revision of rhynchocephalian phylogeny

机译：The diversity of Triassic South American sphenodontians: a new basal form, clevosaurs, and a revision of rhynchocephalian phylogeny

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Rhynchocephalians are a group of lizard-like diapsid reptiles that were very diverse during the Mesozoic but are now restricted to a single extant genus in New Zealand. Recent cladistic analyses have revealed two major clades, Eusphenodontia and the more crownward Neosphenodontia, but relationships of individual taxa have remained difficult to determine because of missing data and an unrevised data matrix. Here we drastically revise the established data matrix on rhynchocephalians by reassessing, evaluating, and adding new characters and operational taxonomic units, differing from any previous analyses in our goal to consider all known rhynchocephalians. In addition, we describe a new genus and species of an early eusphenodontian taxon from the Norian of southern Brazil, with a unique mosaic of plesiomorphic and apomorphic traits, and we re-examine the craniodental anatomy of the eusphenodontian Clevosaurus brasiliensis with mu CT imaging, revealing a unique form of acrodonty amongst rhynchocephalians.

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《Journal of Systematic Palaeontology》 |2021年第12期|787-820|共34页
作者
Chambi-Trowell Sofia A. V.; Martinelli Agustin G.; Whiteside David I.Vivar Paulo R. Romo deSoares Marina BentoSchultz Cesar L.Gill Pamela G.Benton Michael J.Rayfield Emily J.;
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Univ Bristol, Sch Earth Sci, Bristol BS8 1TF, Avon, England;

CONICET Secc Paleontol Vertebrados, Museo Argentino Ciencias Nat Bernardino Rivadavia, Ave Angel Gallardo C1405DJR, Buenos Aires, DF, Argentina;

Univ Bristol, Sch Earth Sci, Bristol BS8 1TF, Avon, England|Nat Hist Museum, Dept Earth Sci, Cromwell Rd, London SW7 5BD, EnglandUniv Fed Rio Grande do Sul, Programa Posgrad Geociencias, Inst Geociencias, Agron, Ave Bento Goncalves 9500, BR-91501970 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Programa Posgrad Geociencias, Inst Geociencias, Agron, Ave Bento Goncalves 9500, BR-91501970 Porto Alegre, RS, Brazil|Univ Fed Rio de Janeiro, Dept Geol & Paleontol, Quinta Boa Vista S-N, BR-20940040 Rio De Janeiro, RJ, BrazilUniv Fed Rio Grande do Sul, Programa Posgrad Geociencias, Inst Geociencias, Agron, Ave Bento Goncalves 9500, BR-91501970 Porto Alegre, RS, Brazil|Univ Fed Rio Grande do Sul, Lab Paleontol & Vertebrados, Porto Alegre, RS, Brazil;

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Triassic; Rhynchocephalia; Sphenodontia; Clevosaurus; morphology; cladistics;

The diversity of Triassic South American sphenodontians: a new basal form, clevosaurs, and a revision of rhynchocephalian phylogeny

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