Trigonocelia insolita Sowerby 1846 (TaxonConcept

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Tertiäre marine Gastropoden

Species Trigonocelia insolita Sowerby 1846

Discussion / Comments:

Griffin & Nielsen (2008):
TYPE MATERIAL. Syntypes: NHM-L27963 (Santa Cruz), NHM-L27957, NHM-L27958 and NHM-L27959 (Santa Cruz). REMARKS. The interior of syntype NHM-L27957 was illustrated by Sowerby (1846, pl. 2, fig. 20), while the figured exterior is that of the incomplete left valve on the slab numbered NHM-L27963 (Sowerby 1846, p. 252, pl. 2, fig. 21). Del Río and Camacho (1998, p. 77) mentioned that “the holotype of this species consists of a left valve found by Darwin in the lowermost horizons of the Monte León Formation at the mouth of the Santa Cruz River”. They were obviously unaware that the two figures on Sowerby’s plate showed two different specimens. As the specimens illustrated are clearly different, their lecotype designation by inference of holotype is invalid (ICZN 1999, Art. 74.5). In any event, this is the only species of Limopsis in the Monte León Formation. Therefore, a lectotype designation appears at present unnnecessary.

Synonym list:

Griffin & Nielsen (2008):

1846 Trigonocelia insolita Sowerby. - Sowerby : p.252 pl. 2; fig. 20, 21

1902 Limopsis insolita Sowerby. - Ortmann : p.91 pl. 25; fig. 6

1998 Limopsis (Limopsis) insolita Sowerby. - del Rio & Camacho : 76-77 pl. 1; fig. 10-11

1999 Limopsis insolita Sowerby. - Frassinetti & Covacevich : p.20 pl. 2; fig. 20

2008 Limopsis insolita Sowerby. - Griffin & Nielsen : pl. 7; fig. 1-2

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

del Rio,C.J.. and Camacho,H.H.. (1998):
Tertiary nuculoids and arcoids of eastern Patagonia (Argentina) . Palaeontographica A Vol. 250 p. 47-88

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

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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