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Species Pleurotoma discors Sowerby 1846


Discussion / Comments:
Griffin & Nielsen (2008):
TYPE MATERIAL. Two syntypes are present in the Darwin Collection: NHM- G26403 (Plate 20, Figures 20-21) and G26404 (Plate 20, Figures 18-19). However, these do not belong to the same species. G26404 is here selected as lectotype to clearly identify this species. REMARKS. This species is assigned to Ptychosyrinx Thiele, 1925 [type species Pleurotoma (Subulata) bisinuata von Martens, 1901] – a subgenus of Gemmula Weinkauff, 1875 [type species Pleurotoma gemmata Reeve, 1843 (non Conrad, 1835) = Gemmula hindsiana Berry, 1958] because of its sculptural features, which resemble very much the Recent Chilean G. (Ptychosyrinx) chilensis Berry (1968), the only Recent eastern Pacific species of this subgenus. Gemmula (Ptychosyrinx) pseudodiscors is similar to some species of Comitas Finlay, 1926 [type species Drillia fusiformis Hutton, 1877] but we prefer to maintain this species in Ptychosyrinx until sinus position and protoconch are known from well preserved specimens.
Synonym list:
Griffin & Nielsen (2008):
1846 Pleurotoma discors Sowerby. - Sowerby : p.258 pl. 4; fig. 54 (junior primary homonym of P. discors Sowerby, 1846, and P. discors Philippi, 1844)
1852 Pleurotoma nom. nov pseudodiscors d'Orbigny. - d'Orbigny : p.65
1979 Pleurotoma santacruzensis Tavera. - Tavera : p.89 pl. 18; fig. 55 (non Ihering, 1907)
1992 Ptychosyrinx nov sp. . - Shuto : pl. 1; fig. 4, 5
2000 Gemmula sp. 2 . - Frassinetti : p.147
2008 Gemmula (Ptychosyrinx) pseudodiscors d'Orbigny. - Griffin & Nielsen : pl. 20; fig. 18-21
Was used in synonym list of:
Turricula pseudodiscors d'Orbigny 1852
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

d'Orbigny,A. (1852):
Prodrome de Paléontologie. Stratigraphique universelle des animaux mollusques & rayonnés faisant suitre au cours élémentaire de paléontologie et de géologie stratigraphique. Vol. 3 p. 189

Tavera,J.J.. (1979):
Estratigrafia y paleontologia de la Formacion Navidad, provincia de Colchagua, Chile (Lat. 30 degrees 50' - 34 degrees S) Translated Title: Stratigraphy and paleontology of the Navidad Formation, Colchagua, Chile; Lat. 30 degrees 50'-34 degrees S.. Vol. 36 p. 176

Shuto,T.. (1992):
Affinity of the Late Miocene turrid fauna of Chile . Reports of Andean Studies, Shizuhoka University, Special Vol. 4 p. 21-31

Frassinetti,D.. (2000):
Moluscos del plioceno superior marino de Isla Guafo, sur de Chile. Parte II: gastropoda . Boletín del Museo nacional de historia natural, n°spécial:, Santiago Vol. 49 p. 131-161

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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