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Pecten geminatus Sowerby 1846 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 geminatus Sowerby 1846



Discussion / Comments:
Griffin & Nielsen (2008):
TYPE MATERIAL. Holotype: NHM-L27695. REMARKS. The holotype is a juvenile right valve. Morra (1985, p. 302) correctly pointed out that, as the exact locality and stratigraphic horizon from where the holotype comes are not clear, and many other species of Zygochlamys share the geminate ribs on young specimens, the name should be left in suspense. However, an adequate suite of specimens of all stages of other species of this genus confirms that the species is valid, and Zygochlamys dominator Morra, 1985 (p. 303-304, pl. 2, figs 1a-b) is the adult stage. Sowerby’s illustration (Sowerby 1846, pl. 2, fig. 24) is fairly accurate, but does not show the costae as clearly arranged in pairs as in the specimen itself. It has eight pairs of costae plus one largish posterior one and two largish anterior ones, with one very fine secondary costa in each radial interspace in between the pairs. Therefore, Zygochlamys dominator is a junior synonym of Zygochlamys geminata. Pecten geminatus is the type species of Zygochlamys Ihering, 1907.
Synonym list:
Griffin & Nielsen (2008):
1846 Pecten geminatus Sowerby. - Sowerby : p.252 pl. 2; fig. 24
? 1985 Zygochlamys n sp. dominator . - Morra : 303-304 pl. 2; fig. 1a-1b
1999 Zygochlamys geminatus Sowerby. - Frassinetti & Covacevich : p.24 pl. 3, fig. 10-11; pl. 4, fig. 2-4 [sic]
2004 Zygochlamys geminata Sowerby. - del Rio : fig. 9.5
2008 Zygochlamys geminata Sowerby. - Griffin & Nielsen : pl. 5; fig. 1
References:

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

Morra,G.. (1985):
Revisión de Zygochlamys (Mollusca: Bivalvia) . Ameghiniana Vol. 22 p. 300-306

Frassinetti,D.. and Covacevich,V.. (1999):
Invertebrados fosiles marinos de la Formacion Guadal (Oligoceno superior-Mioceneo inferior) en Pampa Castillo, region de Aisen, Chile Translated Title: Invertebrate marine fossils from the Guadal Formation (upper Oligocene-lower Miocene) at Pampa Castillo, Aisen region, Chile.. Vol. 51 p. 96

del Rio,C.J.. (2004):
Tertiary marine molluscan assemblages of eastern Patagonia (Argentina): a biostratigraphic analysis . Journal of Paleontology Vol. 78 p. 1097-1122

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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