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Species Turritella patagonica Sowerby 1846

Discussion / Comments:
Griffin & Nielsen (2008):
TYPE MATERIAL. Two syntypes: NHM-G26408; NHM-G26409 (probably Port Desire). REMARKS. The age of this species remains uncertain, as “Port Desire” could well mean either the late Oligocene-early Miocene “Patagonian” beds or the Pliocene (?) sediments exposed in Cerro Laziar. Sowerby also mentions “fragments from Navidad”, but these were not located in the Darwin Collection. In order to fix the status of this species we designate specimen NHM-G26408 as the lectotype. This appears to be the specimen figured by Sowerby. Sowerby stated that he adopted the name (i.e., patagonica) following a suggestion by d’Orbigny (possibly in a personal communication). A specimen from Playa La Mina was figured by del Río (2004b). This species may belong in Incatella DeVries (2007), because of its resemblance to other South American species of this genus. However, we refrain from assigning it to this genus because early whorls are not available on the two syntypes so the development of spiral cords is not known. Later whorls have a secondary subsutural cord, followed by a primary immediately below, a wide interspace which may show one to three secondary cords and always has fine spiral threads, two closely spaced strong primary cords at the lower angulation and a secondary cord just next to the lower one at the base.
Synonym list:
Griffin & Nielsen (2008):
1846 Turritella patagonica Sowerby. - Sowerby : p.256 pl. 3; fig. 48
2004 "Turritella" patagonica Sowerby. - del Rio : fig. 9.3
2008 "Turritella" patagonica Sowerby. - Griffin & Nielsen : pl. 22; fig. 12-13
Was used in synonym list of:
Turritella pseudosuturalis d'Orbigny 1852
Turritella suturalis Sowerby 1846

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

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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