Bairdia lungtanensis 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 : 668

Bairdia lungtanensis Chen, 1958

( Fig. 11 M-O)

Bairdia lungtanensis Chen, 1958: 224 , 246, pl.4, Figs 1-8.

MATERIAL EXAMINED. — Five complete carapaces.

OCCURRENCES. — Lungtan section, Chihsia Limestone, Nanking Province , Early Permian ( Chen 1958) ; samples 08LO02-9 and 08LO02-11, Tham Nam Maholan section, Nam Maholan Formation , Loei province, northeastern Thailand, Early Permian ; sample 07 PB03-7 , Khao Kana section, Pha Nok Khao Formation, Phetchabun province, central Thailand, Early Permian ; sample 07LB05-1, Ta Kli section, Tak Fa Formation, Middle Permian , Nakhon Sawan province, Central Thailand .

DIMENSIONS. — H = 0.39-0.75 mm, L = 0.71-1.40 mm, H/L = 0.51-0.54.

REMARKS

The specimens recovered from central Thailand are of different sizes; the specimen shown in Fig. 11M is comparable with illustration of Chen (1958: fig. 1, pl. 4) but others are somewhat different that may suggest ontogenic morphological changes.

Figures

FIG. 11. — Ostracods from Indochina Block, Central Thailand. All specimens are stored at the Suranaree University of Technology Collections (Nakhon Ratchasima,Thailand) numbers SUT-09-xxxx. A, B, Bairdia cf. deweveri Crasquin,2010;A, right lateral view of a complete carapace, SUT-09-2129, sample 07PB03-3; B, right lateral view of a complete carapace, SUT-09-2130, sample 07PB03-3; C, Bairdia sp. B, external view of a right valve, SUT-09-2295, sample 07PB08-2; D, E, Bairdia broutini Crasquin, 2010; D, right lateral view of a complete carapace, SUT-09-2112, sample 07LB05-2; E, right lateral view of a complete carapace, SUT-09-2116, sample 07LB04-13; F, Bairdia sp. C, left lateral view of a complete carapace, SUT-09-2296, sample 07PB06-5; G, H, Bairdia pierrevalentini Crasquin, 2010; G, right lateral view of a complete carapace, SUT-09-2256, sample 07PB04-5; H, right lateral view of a complete carapace, SUT-09-2257, sample 07PB04-5; I, Petasobairdia sp., left lateral view of a complete carapace, SUT-09-2577, sample 07PB08-3; J-L, Bairdia deducta deducta Zalanyi, 1974 sensu Kozur 1985; J, right lateral view of a complete carapace, SUT-09-2172, sample 07PB05-2; K, right lateral view of a complete carapace, SUT-09-2177, sample 08LB01-6; L, right lateral view of a complete carapace, SUT-09-2176, sample 08LO02-9; M-O, Bairdia lungtanensis Chen, 1958; M, right lateral view of a complete carapace, SUT-09-2244, sample 07PB03-7; N, right lateral view of a complete carapace, SUT-09-2246, sample 08LO02-9; O, right lateral view of a complete carapace, SUT-09-2245, sample 08LO02-11. Scale bars: 100 µm.

FIG. 1. — Geotectonic map of mainland Thailand, with distribution of Permian rocks of the Indochina block relevant to this study and the studied areas: A, Loei area; B, Phetchabun area; C, Nakhon Sawn-Lopburi area; I, Indochina block; II, Sukhothai zone; III, Intanon zone; IV, Sibumasu block; MPF, Mae Ping Fault; TPF, Three Pagodas Fault (Chitnarin et al. 2012).

FIG. 2. — Lithostratigraphiccolumns of the studied formations (see Chitnarin et al.2012 for details) and correlations of the Permianstrata relevant tothis study (modified from Chitnarin et al.2012).A, B and C correspond toareas illustrated in Figure 1.

FIG. 3. — 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-D, Bairdia khaokanaensis Chitnarin,n. sp.; A, holotype, right lateral view, SUT-09-2223, sample 07PB03-3; B, paratype, right lateral view, SUT-09-2226, sample 07PB03-3; C, paratype, right lateral view, SUT-09- 2231, sample 07PB03-3; D, left lateral view, SUT-09-2232, sample 07PB03-5; E, F, I, J, Bairdia incisedorsa Chitnarin, n. sp.; E, holotype, right lateral view, SUT-09-2216, sample 07PB05-3; F, paratype, right lateral view, SUT-09-2215, sample 07PB05-3; I, paratype, dorsal view, SUT-09-2221, sample 07PB05-3; J, ventral view, paratype, SUT-09-2220, sample 07PB05-3. G, H, K, L Bairdia fontainei Chitnarin, n. sp.; G, holotype, right lateral view, SUT-09-2187, sample 07LB05-3; H, paratype, right lateral view, SUT-09-2182, sample 07PB04-5; K, paratype, right lateral view, SUT-09-2183, sample 07PB05-3; L, right lateral view, SUT-09-2178, sample 07LB05-5; M-P, Bairdia songthami Chitnarin, n. sp.; M, holotype, right lateral view, SUT-09-2283, sample 07LB05-5; N, paratype, right lateral view, SUT-09-2278, sample 07PB05-4; O, paratype, left lateral view, SUT-09-2281, sample 07PB03-1; P, right lateral view, SUT-09-2284, sample 07LB05-A2. Scale bars: 100 μm.