Acratia recurvata? Cordell, 1952

Zazzali, Sindbad, Crasquin, Sylvie, Deconinck, Jean-François & Feng, Qinglai, 2015, Biodiversity across the Guadalupian-Lopingian Boundary: first results on the ostracod (Crustacea) fauna, Chaotian section (Sichuan Province, South China), Geodiversitas 37 (3), pp. 283-313 : 292

Acratia recurvata? Cordell, 1952

( Fig. 5C, D )

Acratia recurvata Cordell, 1952: 81 , 82, pl. 20, fig. 65. — Shi & Chen 2002: 81, 82, pl. 20, figs 19-24.

MATERIAL EXAMINED. — Three complete carapaces and 13 broken carapaces.

DIMENSIONS. — L= 499-1197 µm; H= 244-500 µm.

OCCURRENCES. — Oread Formation, Missouri, USA, Late Carboniferous ( Cordell 1952); Guangxi, China, Late Permian ( Shi & Chen 2002);?Chaotian section, Sichuan Province, China, Wujiaping Formation, basal Wuchiapingian, Late Permian (this study, samples: 11CHAO81, 11CHAO85, 11CHAO90, 11CHAO95, 11CHAO97, 11CHAO98, 11CHAO99, 11CHAO100, see Table 1).

REMARKS

Our specimens are very similar to A. recurvata Cordell, 1952 from the Late Pennsylvanian (Late Carboniferous) of Missouri ( USA; Cordell 1952) and Late Permian of South China ( Shi & Chen 2002) but differ in having a more concave AVB, a VB slightly concave at mid-L and the PDB connection with DB forming a more or less marked angle.

Figures

FIG. 5. — Ostracods from Guadalupian-Lopingian boundary interval in South China: A, B, Acratia nagyvisnyoensis? Forel, 2013; A, right lateral view, P6M3596, 11CHAO84; B, right lateral view, P6M3597, 11CHAO81; C, D, Acratia recurvata? Cordell, 1952; C, left lateral view, P6M3598, 11CHAO81; D, left lateral view, P6M3599, 11CHAO99; E, Acratia sp. 1, right lateral view, P6M3600, sample 11CHAO171; F, Acratia sp. 2, right lateral view, P6M3601, sample 11CHAO167; G, Acratia sp. 3, right lateral view, P6M3602, sample 11CHAO95; H, Acratia sp. 4, left lateral view, P6M3603, sample 11CHAO80; I, Acratia sp. 5, right lateral view, P6M3604, sample 11CHAO95; J, Acratinella sp. 1, left lateral view, P6M3605, sample 11CHAO173; K, Acratinella? sp. 2, right lateral view, P6M3606, sample 11CHAO173; L, Acratinella sp. 3, right lateral view, P6M3607, sample 11CHAO99; M, Acratinella sp. 4, right lateral view, P6M3608, sample 11CHAO99; N, Acratinella? sp. 5, right lateral view, P6M3609, sample 11CHAO97. All photographs represent complete carapaces. Scale bar: 100 μm.