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Morphology and taxonomic position of the bizarre Permian pachydomid bivalve Leinzia from Western Gondwana

dc.contributor.authorSimoes, Marcello G. [UNESP]
dc.contributor.authorGuerrini, Vitor B. [UNESP]
dc.contributor.authorMatos, Suzana A. [UNESP]
dc.contributor.authorRohn, Rosemarie [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2020-12-10T17:34:20Z
dc.date.available2020-12-10T17:34:20Z
dc.date.issued2020-01-01
dc.description.abstractThe genus Leinzia is a typical member of the renowned Artinskian-Wuchiapingian (Permian) endemic bivalve fauna of the Passa Dois Group, Parana Basin, Brazil. The extraordinary shells of Leinzia, characterized by a rostrum extending from the anterior cardinal margin led certain authors to regard them as bivalved arthropods (Spinicaudata). Due to the unusual morphology and typically poor preservation of the available specimens, the taxonomic position of Leinzia still remains obscure. Leinzia has been variously referred either to the Pterioida, the Crassatelloidea, the Sanguinolitidae, or the Megadesmidae, or to the Pholadomyida. Herein, based on a detailed review of the topotype material and description of newly found specimens of Leinzia from the Serrinha Member, Rio do Rasto Formation, southern Brazil, we shed light on the taxonomic position of this genus. The hinge of the right valve with its large, blunt, anteriorly inclined subumbonal tooth and corresponding socket in the left valve coupled with the absence of true lateral teeth indicate close affinities to Pyramus and Cowperesia. Thus, the data here strongly suggest a Pachydomidae (Edmondioidea) rather than a Crassatelloidea affinity for Leinzia. Conversely, Leinzia differs from all other known Pachydomidae due to its anteriorly rostrate and posteriorly elongated shell. Finally, detailed stratigraphic data indicate that the vertical distribution of Leinzia is constrained to the middle part of the Guadalupian Serrinha Member of the Rio do Rasto Formation.en
dc.description.affiliationSao Paulo State Univ, Inst Biosci, Botucatu Campus,POB 510, BR-18618689 Botucatu, SP, Brazil
dc.description.affiliationSao Paulo State Univ, Inst Geosci & Exact Sci, Rio Claro Campus, BR-13506900 Rio Claro, Brazil
dc.description.affiliationUnespSao Paulo State Univ, Inst Biosci, Botucatu Campus,POB 510, BR-18618689 Botucatu, SP, Brazil
dc.description.affiliationUnespSao Paulo State Univ, Inst Geosci & Exact Sci, Rio Claro Campus, BR-13506900 Rio Claro, Brazil
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent291-303
dc.identifierhttp://dx.doi.org/10.4202/app.00665.2019
dc.identifier.citationActa Palaeontologica Polonica. Warsaw: Inst Paleobiologii Pan, v. 65, n. 2, p. 291-303, 2020.
dc.identifier.doi10.4202/app.00665.2019
dc.identifier.issn0567-7920
dc.identifier.lattes8936275161197131
dc.identifier.orcid0000-0001-6110-4194
dc.identifier.urihttp://hdl.handle.net/11449/195427
dc.identifier.wosWOS:000539030100006
dc.language.isoeng
dc.publisherInst Paleobiologii Pan
dc.relation.ispartofActa Palaeontologica Polonica
dc.sourceWeb of Science
dc.subjectBivalvia
dc.subjectPachydomidae
dc.subjectMegadesmidae
dc.subjectendemism
dc.subjectGuadalupian
dc.subjectParana Basin
dc.subjectBrazil
dc.titleMorphology and taxonomic position of the bizarre Permian pachydomid bivalve Leinzia from Western Gondwanaen
dc.typeArtigopt
dcterms.rightsHolderInst Paleobiologii Pan
dspace.entity.typePublication
unesp.author.lattes8936275161197131[4]
unesp.author.orcid0000-0001-6110-4194[4]
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Biociências, Botucatupt
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Geociências e Ciências Exatas, Rio Claropt

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