Bairdia trianguliformis Chen, 1958

Chitnarin, Anisong, Crasquin, Sylvie, Forel, Marie-Béatrice & Tepnarong, Prachya, 2017, Ostracods (Crustacea) of the Early-Middle Permian (Cisarulian-Guadalupian) from Central Thailand (Indochina Block): Part II, Orders Podocopida, Platycopida and Myodocopida, Geodiversitas 39 (4), pp. 651-690 : 666

Bairdia trianguliformis Chen, 1958

( Fig. 10 G-H)

Bairdia trianguliformis Chen, 1958: 244 , pl. 6, figs 9-12. — Chen & Shi 1982: 121, pl. 4, figs 6-8. — Shi & Chen 2002: 66, pl. 4, figs 3-9.

MATERIAL EXAMINED. — Two complete and three incomplete carapaces.

OCCURRENCES. — Kwanshan and Lungtan sections, Jiangsu Province, Early Permian ( Chen 1958) ; Nantong section, Jiangsu Province, latest Permian ( Chen & Shi 1982) ; Matan and Pingding sections, Guangxi province , Late Permian ( Shi & Chen 2002) ; sample 08LO02-9, Tham Nam Maholan section, Nam Maholan Formation, Loei province, Northeastern Thailand, Early Permian ; samples 08LO07-1 and 08LO07-10, Sak Chai Quarry section, Pha Nok Khao Formation , Loei Province, Northeastern Thailand, Early Permian ; samples 07LB05-B1 and 07LB05-C3, Ta Kli section, Tak Fa Formation , Nakhon Sawan province, Central Thailand, Early Permian .

DIMENSIONS. — H = 0.61-0.89 mm, L = 1.19-1.79 mm, H/L = 0.48-0.50.

REMARKS

Bairdia trianguliformis from the Early Permian of Eastern China ( Chen 1958) can be recognized by the strong overlap of LV on RV in dorsal region that makes a triangular area in the central of DB. The carapace is long and thin. Posterior end is tapering.

Figures

FIG. 10. — Ostracods from Indochina Block, Central Thailand. All specimens are stored at the Suranaree University of Technology Collections (Nakhon Ratchasima, Thailand) numbers SUT-09-xxxx. All the specimens are complete carapaces in right lateral view. A, B, Bairdia cf. calida Chen, 1958; A, SUT- 09-2127, sample 07PB03-7; B, SUT-09-2128, sample 07PB25-3; C, D, Bairdia beedei Ulrich & Bassler, 1906; C, SUT-09-2685, sample 07PB03-3; D, SUT- 09-2687, sample 07PB04-2; E, F, Bairdia altiarcus Chen, 1958; E, SUT-09-2105, sample 07LB05-D2; F, SUT-09-2101, sample 07LB05-D3; G, H, Bairdia trianguliformis Chen, 1958; G, SUT-09-2318, sample 08LO07-10; H, SUT-09-2319, sample 08LO07-1; I, Kempfina cf. qinglaii (Crasquin, 2008), SUT-09-2533, sample 07PB03-7; J, Bairdia sp. D SUT-09-2300, sample 07LB09-2; K, Bairdia sp. E, SUT-09-2301, sample 08LO02-10; L, Bairdia sp. F, SUT-09-2311, sample 07LB05-5; M, N, Bairdia sp. G; M, SUT-09-2307, sample 07PB04-2; N, SUT-09-2306, sample 07PB04-2; O, Bairdia sp. H, SUT-09-2310, sample 07PB05-6. Scale bars: 100 µm.