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Pecten darwinianus 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 Pecten darwinianus d'Orbigny 1842

Discussion / Comments:
Griffin & Nielsen (2008):
TYPE MATERIAL. There is one specimen in the d’Orbigny Collection at the Laboratoire de Paléontologie under Catalogue Falunien B number 11115 labelled as “Pecten Darwinianus”. However, this specimen is not the one mentioned by d’Orbigny in the text, which is a fragment according to him. The specimen in the collection is an almost complete valve of Zygochlamys actinodes (Sowerby). A thorough search in the collection of the Laboratoire de Paléontolgie and the Laboratoire de Geologie at the MNHN yielded no results. The only fragment, i.e., the holotype, seems to be lost. REMARKS. This is not a nomen nudum, as the holotype existed and had a description – albeit brief – and differentiating remarks in the original text by d’Orbigny. A neotype would be required in order to fix the name and avoid confusion with Amusium paris del Río (1992, p. 23-24, pl. 2, figs 3-4; pl. 3, figs 1-2), which was described from rocks of similar age exposed on Valdés Peninsula (Puerto Madryn Formation) and also referred to the late Miocene. However, such an action should wait until additional material from Paraná is collected and properly described.
Synonym list:
Griffin & Nielsen (2008):
1842 Pecten darwinianus d'Orbigny. - d'Orbigny : p.133
non 1846 Pecten darwinianus d'Orbigny. - Sowerby : p.253
non 1846 Pecten darwinii Sowerby. - Sowerby : pl. 3; fig. 28-29
1893 Pecten darwinianus d'Orbigny. - Philippi : p.12 pl. 3; fig. 4
1897 Amusium darwinianum d'Orbigny. - Ihering : 225-226
1901 Pecten darwinianus d'Orbigny. - Borchert : 22-24 pl. 2; fig. 1-2
1915 Pecten (Amusium) darwinianum d'Orbigny. - Doello-Jurado : p.379
p 1967 Amusium darwinianum d'Orbigny. - Camacho : p.65 non pl. 9; fig. 9a-9b
1991 Amusium darwinianum d'Orbigny. - del Rio : 51-53 pl. 1, fig. 4; pl. 2, fig. 1; pl. 4, fig. 2-3
1998 Amusium darwinianum d'Orbigny. - del Rio & Martinez Chiappara : p.57 pl. 18; fig. 4
2002 Amusium darwinianum d'Orbigny. - Martinez & del Rio : fig. 12.3
2008 Amusium darwinianum d'Orbigny. - Griffin & Nielsen :

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

Sowerby,G.B.. (1846):
Descriptions of Tertiary fossil shells from South America..
In: Geological observations on South America. Eds: Darwin, C.. p. 249-264

Philippi,R.A.. (1893):
Fósiles terciarios de la República Argentina . Anales del Museo Nacional de Chile p. 11

Ihering,v.H.. (1897):
Os molluscos dos terrenos terciarios da Patagonia . Revista do Museu Paulista Vol. 2 p. 217-382

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

Doello-Jurado,M.. (1915):
Algunos moluscos marinos terciarios procedentes de un pozo surgente cerca de La Plata . Physis Vol. 1 p. 592-598

Camacho,H.H.. (1967):
Fascículo 3, Invertebrados.
In: Paleontografía Bonaerense Eds: Borello, A.V.. p. 159

del Rio,C.J.. (1991):
Revisión sistemática de los bivalvos de la Formación Paraná (Mioceno medio) - Provincia de Entre Ríos - Argentina . Monografía de la Academia Nacional de Ciencias Exactas, Físicas y Naturales, Buenos Aires Vol. 7 p. 1-97

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

Martinez,S.. and del Rio,C.G.. (2002):
Late Miocene molluscs from the southwestern Atlantic Ocean (Argentina and Uruguay): a palaeobiogeographic analysis. . Palaeogeography, Palaeoclimatology, Palaeoecology Vol. 188 p. 167-187

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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