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Ostrea patagonica d'Orbigny 1842 from: Griffin, M..Nielsen, S.N.. (2008): A revision of the type specimens of Tertiary molluscs from Chile and Argentina described by d’Orbigny (1842), Sowerby (1846), and Hupé (1854) . Journal of Systematic Palaeontology
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Species Ostrea patagonica d'Orbigny 1842

Discussion / Comments:
Griffin & Nielsen (2008):
TYPE MATERIAL. Most syntypes are housed in the Typothèque of the Laboratoire de Géologie under the following numbers MNHN-Gg2002/108 (lectotype designated herein, a right valve, d’Orbigny Collection, Catalogue 3L-49); MNHN-Gg2002/109 (six syntypes, two double valves and 4 left valves, d’Orbigny Collection, Catalogue 3-L50); MNHN-Gg2005/14 (four syntypes, Bonpland Collection, Catalogue 6O-112/113); MNHN-Gg2005/8 (five syntypes, Catalogue 7X-213/215); MNHN-Gg2005/9 (one syntype, Catalogue 1080-7); MNHN-Gg2005/15 (syntype, the closed shell illustrated by d’Orbigny, 1842, pl. 7, fig. 15, 16); MNHN-Gg2005/10 (ten syntypes, Catalogue 3L-32). Since all have been available to d’Orbigny, they are all part of the type series. Two additional syntypes are housed in the Laboratoire de Paléontologie under number MNHN-A14086 (Catalogue Falunien B 11142). REMARKS. Two of the specimens in the Laboratoire de Paléontologie and two in the Laboratoire de Géologie are right valves of Ostrea alvarezii d’Orbigny. In order to prevent further confusion and fix the nomenclatural status of this species, the specimen illustrated in Plate 10, Figures 1, 2, (i.e., MNHN-Gg2002/108) is designated lectotype herein. This right valve is preferred because the interior is available showing the strong chomata all around the shell margin. This feature easily distinguishes it from other superficially similar oysters from the Patagonian Cenozoic. Despite the great ecomorphic variation shown by this oyster, shell features such as the deep umbonal cavity in the left valve, the shape and position of the posterior adductor muscle scar and the diffuse radial ribs on the left valve (all similar to living representatives of Crassostrea), allow its inclusion in Crassostrea Sacco, 1897 [type species Ostrea virginica Gmelin, 1791].
Synonym list:
Griffin & Nielsen (2008):
1842 Ostrea patagonica d'Orbigny. - d'Orbigny : p.133 pl. 7; fig. 14-16
1897 Ostrea patagonica d'Orbigny. - Ortmann : p.356 fig. 4 (from d'Orbigny)
1901 Ostrea patagonica d'Orbigny. - Borchert : 17-19 (partim?)
? 1939 Ostrea patagonica d'Orbigny. - Wahnish : p.150 pl. 1; fig. 1a-1b
p 1998 Ostrea patagonica d'Orbigny. - del Rio & Martinez Chiappara : 54-55 pl. 7; fig. 5-6
2008 Crassostrea patagonica d'Orbigny. - Griffin & Nielsen : pl. 10, fig. 1-2; pl. 11, fig. 1-4; pl. 12, fig. 1-3

d'Orbigny,A. (1842):
Voyage dans l'Amerique méridionale.
In: Paléontologie Vol. 3(4) p. 187

Ortmann,A.E.. (1897):
On some of the large oysters from Patagonia . American Journal of Science Vol. 4 p. 355-356

Borchert,A.. (1901):
Molluskenfauna und das Alter der Paraná-Stufe . Neues Jahrbuch für Mineralogie, Geologie und Paläontologie, Beilage Vol. 14 p. 171-245

Wahnish,E.. (1939):
Perforación Riachuelo Nº 5 Buenos Aires, perfil geológico y descripción de los fósiles . Revista del Centro de Estudiantes de Ciencias Naturales Vol. 2 p. 141-156

del Rio,C.J.. and Martinez Chiappara,S.A.. (1998):
Clase Bivalvia.
In: Moluscos marinos Miocenos de la Argentina y del Uruguay Vol. 15 Eds: del Rio, C.J.. p. 48-83

Griffin,M.. and Nielsen,S.N.. (2008):
A revision of the type specimens of Tertiary molluscs from Chile and Argentina described by d’Orbigny (1842), Sowerby (1846), and Hupé (1854) . Journal of Systematic Palaeontology

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