Ostracods (Crustacea) of the Early-Middle Permian (Cisarulian-Guadalupian) from Central Thailand (Indochina Block): Part II, Orders Podocopida, Platycopida and Myodocopida Author Chitnarin, Anisong Author Crasquin, Sylvie Author Forel, Marie-Béatrice Author Tepnarong, Prachya text Geodiversitas 2017 2017-12-29 39 4 651 690 http://dx.doi.org/10.5252/g2017n4a1 journal article 10.5252/g2017n4a1 1638-9395 4536112 urn:lsid:zoobank.org:pub:DB464417-3EA1-4C4E-9C03-624C1627969C Bairdia cf. calida Chen, 1958 ( Fig. 10A, B ) Bairdia calida Chen, 1958: 243 , pl. IV, figs 9-15. MATERIAL EXAMINED. — One complete and two incomplete carapaces. OCCURRENCES. — Sample 07 PB03-7 , Khao Kana section, Pha Nok Khao Formation, Phetchabun province , Central Thailand , Early Permian ; sample 07 PB05-3 , Ban Naen Sawan I section, Pha Nok Khao Formation, Phetchabun province , Central Thailand , Middle Permian . DIMENSIONS. — H = 0.715 -0.747 mm , L = 1.22-1.33 mm , H/L = 0.56-0.58. REMARKS The specimens are close to Bairdia calida Chen, 1958 from the Early Permian of Jiangsu Province , Eastern China ( Chen 1958 ) which is characterized by a narrow ventral ridge on RV and the dorsal ridge on LV. In our specimens, the ventral ridge on RV is observed; though, the dorsal ridge on LV is not recognized. Bairdia cf. zhongyingensis Wang, 1978 ( Fig. 9D ) Bairdia zhongyingensis Wang, 1978: 16 , pl. III, fig. 2a-c. MATERIAL EXAMINED. — One complete carapace. OCCURRENCES. — Sample 07LB05-A2, Ta Kli section, Tak Fa Formation, Nakhon Sawan Province , central Thailand , Middle Permian. DIMENSIONS. — H = 0.712 mm , L = 1.31 mm , H/L = 0.54. REMARKS The specimen resembles Bairdia zhongyingensis Wang, 1978 from the Late Permian of South China ( Wang 1978 ) in lateral outline, especially for the small radius of curvature of AB, small radius of curvature of PB and concave VB; however, radius of curvature of AB of our specimen is largerand higher and the overlap of LV on RV is not clear. Bairdia beedei Ulrich & Bassler, 1906 ( Fig. 10C, D ) Bairdia beedei Ulrich & Bassler, 1906: 161 , pl. XI, figs 19, 20. — Chen 1958: 249 , pl. 5, figs 1-4. MATERIAL EXAMINED. — Five complete carapaces. OCCURRENCES. — Kwanshan and Lungtan sections, Jiangsu Province, Early Permian ( Chen 1958 ); samples 07 PB 03-1, 07 PB 03-7, Khao Kana section, Pha Nok Khao Formation, Phetchabun Province , Early Permian; sample 07 PB 04-2, Nong Phai section, Pha Nok Khao Formation, Phetchabun Province , Central Thailand , Early Permian. DIMENSIONS. — H = 0.49-0.86 mm , L = 0.82-1.13 mm , H/L = 0.54-0.57. REMARKS Our specimens have elongate, subfusiform carapace in lateral view with strong overlap of LV on RV at DB. DB of RV is steeply arched, DB of LV is straight and the VB is broadly convex. The carapaces of the studied specimens are longer than Bairdia beedei Ulrich & Bassler from Late Carboniferous of North America ( Ulrich & Bassler 1906 ).