Girtypecten (Girtypecten) Newell, 1938

Fang, Zong-Jie, Sun, Yuanlin & Baliński, Andrzej, 2006, A new aviculopectinid bivalve from the Early Carboniferous of Guizhou, China, Acta Palaeontologica Polonica 51 (3), pp. 599-604 : 601

Subgenus Girtypecten (Girtypecten) Newell, 1938

Type species: Aviculopecten sublaqueatus Girty, 1908 ; original designation by Newell (1938: 77); Guadalupian (Middle Permian), Texas.

Species included: Pseudomonotis fimbriata Gemmellaro, 1896 ( Gemmellaro 1896: 204, pl. 23: 16–19; Permian Sosio beds, Sicily, Italy); Girtypecten beipeiensis Liu, 1976 ( Liu 1976: 183, pl. 14: 1; Changhsingian, Late Permian, Sichuan, China); Girtypecten cf. spinosus Chen, 1962 ( Zhang et al. 1977: 510, pl. 197: 5; Late Permian, Guangxi, China; the closest species of this multicostate form seems to be G. qinghaiensis Lu, 1979 rather than G. spinosus , because the latter is an unicostate species); Girtypecten qinghaiensis Lu, 1979 (in Zhang et al. 1979: 227, pl. 58: 1; Middle Permian, Qinghai, China); Girtypecten sublaqueatus ( Girty, 1908) (see Newell and Boyd 1995: 41, fig. 30: 1–7; Upper Wolfcampian–Upper Guadalupian, West Texas and Wyoming).

Stratigraphic and geographic range: Upper Wolfcampian–Changhsingian; Italy, China, and USA.

Diagnosis.—Multicostate Girtypecten with left valve often having pyramidal costal spines rising from the ridge intersections, distally pointed, with a ventral groove along the innerside; resilifer asymmetrical, posteriorly elongate.