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Species Mactra darwinii Sowerby 1846



Discussion / Comments:
Griffin & Nielsen (2008):
TYPE MATERIAL. Two syntypes are present in the Darwin Collection at the NHM under numbers NHM-L27977 and NHM-L27985 REMARKS. The syntype figured by Sowerby (1846, pl. 2, fig. 9) is specimen NHM-L27977, a broken shell in which a small fragment of hinge is visible, but no teeth; the ventral margin is much less complete than suggested by the figure. The other syntype, NHM-L27985, is another poor specimen, a little taller than the figured one, but with the ventral outline and posterior end completely missing. While possibly belonging in Mactra Linnaeus, 1767 [type species Cardium stultorum Linnaeus, 1758], the generic placement of this species remains uncertain and needs confirmation based on additional topotypic material.
Synonym list:
Griffin & Nielsen (2008):
1846 Mactra darwinii Sowerby. - Sowerby : p.249 pl. 2; fig. 9
1902 Mactra? darwinii Sowerby. - Ortmann : 149-150 pl. 29; fig. 8
2008 Mactra? darwinii Sowerby. - Griffin & Nielsen : pl. 4; fig. 2
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

Ortmann,A.E.. (1902):
Tertiary invertebrates: Reports of the Princeton Expedition to Patagonia, 1896–1899. Vol. 4(2) p. 45-332

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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