MolluscaBase name details
Modiola contorta Borchert, 1901 †
1517050 (urn:lsid:marinespecies.org:taxname:1517050)
unaccepted
Species
Modiola [sic] accepted as Modiolus Lamarck, 1799
fossil only
Borchert, A. (1901). Beiträge zur Geologie und Palaeontologie von Südamerika. Unter Mitwerkung von Fachgenossen herausgegeben von G. Steinmann. IX. Die Molluskenfauna und das Alter der Paraná-Stufe. <em>Neues Jahrbuch für Mineralogie, Geologie und Palaeontologie, Beilage.</em> 14: 171-245; plates VI-X. [details]
Type locality contained in Entre Ríos
, Note Paraná, Entre Rios, Argentina
type locality contained in Entre Ríos [details]
From editor or global species database
Type locality Paraná, Entre Rios, Argentina [details]
Homonymy Ihering (1907) considered Modiola contorta Borchert, 1901 an unionid of the genus Diplodon. For whatever reason, he treated...
Homonymy Ihering (1907) considered Modiola contorta Borchert, 1901 an unionid of the genus Diplodon. For whatever reason, he treated the species as a homonym of Unio contortus (authority not stated but probably he meant Lea, 1857) and introduced Diplodon fraus as replacement name. Since there was no homonymy, that new name is a junior objective synonym of Modiola contorta. However, Borchert's name is a primary junior homonym of Modiola contorta Dujardin, 1837. As youngest available synonym, Diplodon fraus is consequently the valid name of the species. [details]
MolluscaBase eds. (2021). MolluscaBase. Modiola contorta Borchert, 1901 †. Accessed at: https://molluscabase.org/aphia.php?p=taxdetails&id=1517050 on 2025-09-11
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original description
Borchert, A. (1901). Beiträge zur Geologie und Palaeontologie von Südamerika. Unter Mitwerkung von Fachgenossen herausgegeben von G. Steinmann. IX. Die Molluskenfauna und das Alter der Paraná-Stufe. <em>Neues Jahrbuch für Mineralogie, Geologie und Palaeontologie, Beilage.</em> 14: 171-245; plates VI-X. [details]
Present Inaccurate Introduced: alien Containing type locality
From editor or global species database
Homonymy Ihering (1907) considered Modiola contorta Borchert, 1901 an unionid of the genus Diplodon. For whatever reason, he treated the species as a homonym of Unio contortus (authority not stated but probably he meant Lea, 1857) and introduced Diplodon fraus as replacement name. Since there was no homonymy, that new name is a junior objective synonym of Modiola contorta. However, Borchert's name is a primary junior homonym of Modiola contorta Dujardin, 1837. As youngest available synonym, Diplodon fraus is consequently the valid name of the species. [details]Type locality Paraná, Entre Rios, Argentina [details]
