Bairdia urodeloformis Chen, 1987

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 : 663-664

Bairdia urodeloformis Chen, 1987

( Fig. 9 G-J)

Bairdia urodeloformis Chen in Shi & Chen, 1987: 40, pl. 4, figs 17- 23. — Crasquin et al. 2010a: 348, figs 7G-N.

Rectobairdia firmata Chen in Chen & Shi, 1982: pl. 7, fig. 10 only.

Bairdia macdonelli Harlton, 1929b: 157 , pl. 3, figs 7a, b. — Shi & Chen 1987: 35, pl. 1, figs 1-7, pl. 18, figs 1-4;2002: 63, pl. 2, figs 1-4.

MATERIAL EXAMINED. — One incomplete and eight complete carapaces.

OCCURRENCES. — Meishan section, Zhejiang Province, latest Permian ( Shi & Chen 1987; Crasquin et al. 2010a); Matan and Pingding sections, Guangxi, South China, Late Permian ( Shi & Chen 2002); sample 07 PB 04-2, Nong Phai section, Pha Nok Khao Formation, Phetchabun Province, central Thailand, Early Permian; samples 07LB05, 07LB05-A2, Ta Kli section, Tak Fa Formation, Nakhon Sawan province, Middle Permian, central Thailand; sample 07 PB 05-3, Ban Naen Sawan I section, Tak Fa Formation, Phetchabun Province, central Thailand, Middle Permian;.

DIMENSIONS. — H= 0.25-0.51 mm,L= 0.54-1.25 mm,H/L = 0.41-0.46.

REMARKS

Such characters as long carapace, broadly arched dorsal outline of LV, angulated dorsal outline of RV with small AB located very high and small PB located very low induce the attribution to Bairdia urodeloformis Chen, 1987 described from the latest Permian of South China ( Shi & Chen 1987).

Bairdia cf. urodeloformis Chen, 1987 ( Fig. 9 K-M)

Bairdia urodeloformis Chen in Shi & Chen, 1987: 40, pl. 4, figs 17- 23.

MATERIAL EXAMINED. — 12 complete carapaces.

OCCURRENCES. — Sample 08LO02-2, Tham Nam Maholan section, Nam Maholan Formation, Loei Province, northeastern Thailand, Early Permian ; samples 07LB05-A1, 07LB05-B2 and 07LB05-B3, Ta Kli section, Tak Fa Formation, Nakhon Sawan Province, Central Thailand, Middle Permian ; sample 08LB01-1, Khao Som Phot section, Tak Fa Formation, Lopburi Province, central Thailand, Middle Permian .

DIMENSIONS. — H = 0.22-0.45 mm, L = 0.63-1.05 mm, H/L = 0.34-0.43.

REMARKS

The specimens are related to Bairdia urodeloformis from the latest Permian of South China (see references above) by their long carapace, small AB with maximum of convexity located very high and small PB with maximum of convexity located very low. The differences are the longer carapace, the more convex PVB, and the overlap along dorsal border.

Figures

FIG. 9. — 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 represented by complete carapaces. A-C, Bairdia guangxiensis Guan, 1978; A, right lateral view, SUT-09-2207, sample 07PB07-4; B, left lateral view, SUT-09-2208, sample 07PB06-3; C, ventral view, SUT-09-2213, sample 07PB07-3. D, Bairdia cf. zhongyingensis Wang, 1978 sensu Chen & Bao, 1986; right lateral view, SUT-09-2339, sample 07LB05-A2; E, F, Bairdia bassoni Crasquin, 2010; E, right lateral view, SUT-09-2117,sample 07PB03-3; F, right lateral view,SUT-09-2118,sample 07PB03-3;G-J, Bairdia urodeloformis Chen, 1987;G, right lateral view,SUT-09-2332, sample 08LB01-1; H, right lateral view, SUT-09-2325, sample 07LB05-5; I, right lateral view, SUT-09-2335, sample 08PB05-3; J, right lateral view, SUT-09-2338, sample 07LB05-5; K-M, Bairdia cf. urodeloformis Chen, 1987; K, right lateral view, SUT-09-2151, sample 07LB05-B2; L, right lateral view, SUT-09-2152, sample 07LB05-3; M, right lateral view, SUT-09-2156, sample 08LO02-2; N-P, Bairdia sp. A; N, right lateral view, SUT-09-2285, sample 07PB04-2; O, right lateral view, SUT-09-2291, sample 07PB04-2; P, right lateral view, SUT-09-2290, sample 07PB04-2. Scale bars: 100 µm.