Samarella Polenova, 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 : 304-306

Genus Samarella Polenova, 1952

TYPE SPECIES. — Samarella crassa Polenova, 1952 by original designation.

Samarella viscusforma Chitnarin, 2012 ( Fig. 16M, N )

Samarella viscusforma Chitnarin in Chitnarin et al., 2012: 818, 819, figs 13A-E, 15.

MATERIAL EXAMINED. — 34 complete carapaces and eight broken carapaces.

DIMENSIONS. — L= 281-592 µm; H= 193-477 µm.

OCCURRENCES. — Loei Province, Northeastern Thailand, Early Permian, Phetchabun Province, Central Thailand, Early Permian and Nakhon Sawan Province, Central Thailand, Late Early Permian and Middle Permian ( Chitnarin et al. 2012); Chaotian section, Sichuan Province, China, Maokou and Wujiaping Formations, Middle Capitanian-basal Wuchiapingian, Middle-Late Permian (this study, samples: 11CHAO 173, 11CHAO172, 11CHAO171, 11CHAO169, 11CHAO163, 11CHAO151, 11CHAO80, 11CHAO81, 11CHAO82, 11CHAO83, 11CHAO84, 11CHAO88, 11CHAO92, 11CHAO100, 11CHAO101, see Table 1).

REMARKS

Variations could be quite important in carapace size, DB shape or VB convexity. The question of the presence of different species could come up. But we observe all the transitional forms between the different extreme morphotypes. So we make the choice to gather all of them in S. viscusforma .

Order PLATYCOPIDA Sars, 1866 Suborder PLATYCOPINA Sars, 1866 Superfamily CAVELLINOIDEA Egorov, 1950 Family CAVELLINIDAE Egorov, 1950

Figures

FIG. 16. — Ostracods from Guadalupian-Lopingian boundary interval in South China: A, Kirkbya sp. 1, right lateral view of complete carapace, P6M3757, sample 11CHAO172; B, Kirkbya sp. 2, left lateral view of left valve, P6M3758, sample 11CHAO164; C, Kirkbya sp. 3, left lateral view of left valve, P6M3759, sample 11CHAO166; D, Kirkbya sp. 4, left lateral view of left valve, P6M3760, sample 11CHAO158; E, Kirkbya sp. 5, left lateral view of left valve, P6M3776, sample 11CHAO88; F, G, Reviya cf. subsompongensis Chitnarin, 2008; F, right lateral view of right valve, P6M3762, sample 11CHAO167; G, right lateral view of right valve, P6M3763, sample 11CHAO166; H, Neoamphissites sp. 1, left lateral view of left valve, P6M3764, sample 11CHAO169; I, J, Kegelites sp. 1; I, left lateral view of complete carapace,P6M3765, sample 11CHAO81; J, left lateral view of complete carapace,P6M3766, sample 11CHAO99; K, L, Kindlella sp. 1; K, right lateral view of complete carapace, P6M3767, sample 11CHAO150; L, left lateral view of complete carapace, P6M3768, sample 11CHAO150; M, N, Samarella viscusforma Chitnarin, 2012; M, right lateral view of complete carapace, P6M3769, sample 11CHAO88; N, left lateral view of complete carapace, P6M3770, sample 11CHAO171; O, Kirkbya sp. 6, sublateral view of broken left valve, P6M3761, sample 11CHAO97. Scale bar: 100 μm.