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Perna gaudichaudi 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 Perna gaudichaudi d'Orbigny 1842

Discussion / Comments:
Griffin & Nielsen (2008):
TYPE MATERIAL. The two syntypes were found in the Gaudichaud Collection of the Laboratoire de Géologie at the MNHN in Paris. They are now housed in the Typothèque there under numbers MNHN-Gg2002/121 and MNHN-Gg2002/122. REMARKS. One of the syntypes, MNHN-Gg2002/122 is the large specimen illustrated by d’Orbigny (1842, pl. 15, figs 14, 15). The figure is very stylized, as the shell ornamentation is not visible. Probably d’Orbigny assumed it had it, as in many members of the group. The other specimen, MNHN-Gg2002/121, is the figured fragment of hinge (d’Orbigny 1842, pl. 15, fig. 16). According to Philippi (1887, p. 200) this species is found at Coquimbo (where Gaudichaud found it) and also at Guayacán and Caldera. He wondered whether Gaudichaud had been luckier than himself in reference to the fact that he had found a complete specimen. However, the large specimen collected by Gaudichaud is an internal mould and the ornamentation is a stylization by d’Orbigny. The species clearly belongs in Isognomon Lightfoot, 1786 [type species Ostrea perna Linnaeus, 1767]. It is also found at the southern tip of Bahía Herradura de Mejillones (own unpublished data). “Melina” pusilla Philippi, 1887 (p. 201, pl. 45, fig. 5) is a small specimen from Matanzas. According to Philippi it is not a juvenile of Isognomon gaudichaudi, but this needs confirmation. Matanzas is general Navidad age, i.e., late Miocene to early Pliocene (Finger et al. 2007), but Frassinetti & Covacevich (1993) noted that Melina pusilla was not found at Matanzas. Perna chilensis Conrad, 1855, from the Miocene near Caldera is a junior synonym.
Synonym list:
Griffin & Nielsen (2008):
1842 Perna gaudichaudi d'Orbigny. - d'Orbigny : p.131 pl. 15; fig. 14-16
1855 Perna chilensis Conrad. - Conrad : p.285 pl. 42; fig. 7 (as Perna chiliana)
1887 Melina (Perna) gaudichaudi d'Orbigny. - Philippi : p.200 pl. 45; fig. 2, 3 (fig. 2 from d'Orbigny)
? 1887 Melina pusilla Philippi. - Philippi : p.201 pl. 45; fig. 5
2008 Isognomon gaudichaudi d'Orbigny. - Griffin & Nielsen : pl. 5; fig. 6-8

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

Conrad,T.A.. (1855):
Remarks on the fossil shells from Chile, collected by Lieut. Gilliss, with descriptions of the species.
In: The U.S. Naval Astronomical Expedition to the Southern Hemisphere during the years 1849-1852 Vol. 2 Eds: Gilliss, J.M.. p. 282-286

Philippi,R.A.. (1887):
Die tertiären und quartären Versteinerungen Chiles.. p. 266

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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