Bairdia altiarcus 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 : 664-665

Bairdia altiarcus Chen, 1958

( Fig. 10E, F )

Bairdia altiarcus Chen, 1958: 223 , pl. 3, figs 21-23, pl. 4, figs 11, 12. — Crasquin et al. 2008a: pl. 2, figs 5-6. — Yuan et al. 2009: pl. 1, fig. 17.

Non Cryptobairdia altiarca – Kozur 1985a: 231, table II, pl. 3, fig. 1.

Cryptobairdia altiarcus – Shi & Chen 2002: 69, pl. 7, figs 1-12.

MATERIAL EXAMINED. — One incomplete and eleven complete carapaces.

OCCURRENCES. — Kwanshan and Lungtan sections, Chihsia Limestone, Nanking Province, Early Permian ( Chen 1958); Matan and Pingding sections, Guangxi, South China, Late Permian ( Shi & Chen 2002) ; Lercara Formation, Sicily, Italy, Middle Triassic ( Crasquin et al. 2008a) ; samples 07LB05-B1, 07LB05-C3, 07LB05-D2 and 07LB05-D3, Ta Kli section, Tak Fa Formation, Nakhon Sawan Province, Central Thailand, Middle Permian .

DIMENSIONS. — H = 0.47-0.896 mm, L = 0.74-1.30mm, H/L = 0.61-0.68.

REMARKS

The specimens recovered in this study can be easily assigned to Bairdia altiarcus from the Early Permian of Eastern China ( Chen 1958) by their lateral characters such as highly arched dorsal outline, AB with large radius of curvature, acuminate and slightly upturned PB. However, some carapaces are compressed and distorted. Generally, our specimens are smaller than the Chinese specimens.

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.