Bairdia menardensis Harlton, 1929

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 : 668

Bairdia menardensis Harlton, 1929

( Fig. 12 D-F)

Bairdia menardensis Harlton, 1929b: 158 , pl. 8, figs 1a-d. — Chen 1958: 248, 249, pl. 3, figs 1-7, 13.

MATERIAL EXAMINED. — Ten complete carapaces.

OCCURRENCES. — Lungtan section, Nanking Province, Early Permian ( Chen 1958); samples 07LB05-A3, 07LB05-B1, 07LB05-D3, Ta Kli section, Tak Fa Formation, Nakhon Sawan Province, central Thailand, Early Permian ; sample 08LB01-6, Khao Som Phot section, Tak Fa Formation, Lopburi Province, central Thailand, Middle Permian .

DIMENSIONS. — H = 0.60-0.78 mm, L = 0.95-1.17 mm, H/L = 0.63.

REMARKS

Sohn (1960) considered Bairdia menardensis as a junior synonym of B. grahamensis Harlton, 1928 . The figured specimens of B. grahamensis ( Sohn 1960: 45, pl. 1, figs 9-10, 15, 16) are different from our specimens. However, the characters such as subrhombohedral carapace, highly arched DB, narrowly rounded AB and PB, and upturned PB agree well with characters of Bairdia menardensis described by Chen (1958) from the Early Permian of China. In the studied specimens, AVB is slightly convex and maximum of curvature of AB is located at or just above mid H.

Figures

FIG. 12. — 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 deweveri Crasquin, 2010; A, right lateral view, SUT-09- 2165, sample 07PB04-2; B, right lateral view, SUT-09-2161, sample 07PB04-2; C, right lateral view, SUT-09-2169, sample 08LO02-10; D-F, Bairdia menardensis Harlton sensu Chen (1958); D, right lateral view, SUT-09-2140, sample 07LB05-B1; E, right lateral view, SUT-09-2147, sample 07LB05-D3; F, right lateral view, SUT-09-2148, sample 08LB01-6; G-I, Lobobairdia ventriconcava (Chen, 1958); G, right lateral view, SUT-09-2539, sample 07PB05-2; H, right lateral view, SUT- 09-2540, sample 07PB05-2; I, left lateral view, SUT-09-2541, sample 07PB07-3; J-P, Petasobairdia campbelli Chitnarin, n. sp.; J, holotype, right lateral view, SUT-09-2568, sample 07LB05-5; K, paratype,left lateral view, SUT-09-2571,sample 07LB05-5; L, dorsal view, SUT-09-2572, sample 07LB05-5; M, ventral view, SUT-09-2573, sample 07LB05-5; N, paratype, right lateral view, SUT-09-2570, sample 07LB05-5; O, left lateral view, SUT-09-2574, sample 07PB05-5; P, left lateral view, SUT-09-2575, sample 07PB05-5. Scale bars: 100 µm.