New freshwater mussels (Bivalvia, Unionida) with potential trigonioidid and hyriid affinities from the Early Cretaceous of Brazil
Silva VR, Varejão FG, Matos SA, Rodrigues MG, Fürsich F, Skawina A, Schneider S, Warren LV, Assine ML, Simões MG (2020)
Publication Type: Journal article
Publication year: 2020
Journal
DOI: 10.1016/j.geobios.2020.06.001
Abstract
Two new taxa of freshwater mussels (Bivalvia: Unionida) from the Aptian Crato Formation of the Araripe Basin, NE Brazil, are described. The fossil bivalves are confined to 30- to 130-cm-thick bioturbated mudstones overlying the fossil-rich laminated limestones of the Crato Formation Konservat-Lagerstätte. Individuals are often preserved with closed or splayed articulated valves, some of them potentially in life position, forming an autochthonous to parautochthonous assemblage. Monginellopsis bellaradiata nov. gen., nov. sp. shares key characters with the Trigonioidoidea: (i) the anterior pedal retractor muscle scar is clearly separated from the anterior adductor muscle scar; (ii) the shell has fold-like radial ribs on the posterior half; (iii) a right valve anterior tooth has a striated facet. Araripenaia elliptica nov. gen., nov. sp. is the most abundant and widely distributed unionid of the Crato Formation. Its ornament of anterior inverted V-shaped riblets, and central and posterior radial and sub-radial riblets resembles modern and fossil Hyriidae from the Americas, but also Trigonioidoidea from Eurasia. Its dentition of two smooth anterior pseudocardinals and two smooth posterior laterals in each valve provides no further clues for systematic assignment; muscle scars are not preserved. Assignment to the Hyriidae would make Araripenaia the oldest member of this family known from South America. Moreover, this bivalve assemblage of trigonioidoidids, hyriids, and previously reported silesunionoids suggests palaeobiogeographic links to other areas in both Gondwana and Laurasia.
Authors with CRIS profile
Involved external institutions
São Paulo State University / Universidade Estadual Paulista "Júlio de Mesquita Filho" (UNESP)
Brazil (BR)
Universidade Federal do Paraná (UFPR)
Brazil (BR)
University of Warsaw / Uniwersytet Warszawski
Poland (PL)
University of Cambridge
United Kingdom (GB)
Brazil (BR)
Universidade Federal do Paraná (UFPR)
Brazil (BR)
University of Warsaw / Uniwersytet Warszawski
Poland (PL)
University of Cambridge
United Kingdom (GB)
How to cite
APA:
Silva, V.R., Varejão, F.G., Matos, S.A., Rodrigues, M.G., Fürsich, F., Skawina, A.,... Simões, M.G. (2020). New freshwater mussels (Bivalvia, Unionida) with potential trigonioidid and hyriid affinities from the Early Cretaceous of Brazil. Geobios. https://dx.doi.org/10.1016/j.geobios.2020.06.001
MLA:
Silva, Victor R.da, et al. "New freshwater mussels (Bivalvia, Unionida) with potential trigonioidid and hyriid affinities from the Early Cretaceous of Brazil." Geobios (2020).
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