Bairdia guangxiensis Guan, 1978

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 : 662

publication ID	https://doi.org/10.5252/g2017n4a1
publication LSID	urn:lsid:zoobank.org:pub:DB464417-3EA1-4C4E-9C03-624C1627969C
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treatment provided by	Felipe (2021-02-11 18:30:34, last updated by Plazi 2023-11-01 20:39:00)
scientific name	Bairdia guangxiensis Guan, 1978
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( Fig. 9 View FIG A-C)

Bairdia guangxiensis Guan in Guan et al., 1978: 154, pl. 38, figs 3-4. — Chen & Shi 1982: 122, pl. 5, fig. 17. — Chen & Bao 1986: 114, pl.3, figs 7-8. — Shi & Chen 1987: 31, pl. 3, figs 1-9; 2002: 67, pl. 5, figs 1-9, pl. 28, figs 1-2.

MATERIAL EXAMINED. — Two complete and 14 incomplete carapaces.

OCCURRENCES. — Wugang, Hunan Province, Early Permian ( Guan et al. 1978); Nantong section, ( Chen & Shi 1982); Well- Bao-1, Chihsia Limestone, Jiangsu Province, Early Permian ( Chen & Bao 1986); Meishan section, Changxing, Zhejiang, South China, latest Permian ( Shi & Chen 1987) ; Matan and Pingding sections, Guangxi, South China, Late Permian ( Shi & Chen 2002) ; samples 07 PB06-3 , 07 PB07-4 and 07 PB08-2 , Ban Naen Sawan II section, Tak Fa Formation, Phetchabun Province, Middle Permian, Central Thailand .

DIMENSIONS. — H = 0.55-0.84 mm, L = 0.82-1.18 mm, H/L = 0.66-0.71.

REMARKS

Bairdia guangxiensis can be easily recognized by presence of ventral beak-like lateral inflations on both valves and flat ventral area. Small differences can be recognized among our specimens; for example, DB of LV is convex unlike the flat DB of those described from Late Permian of Guangxi ( Shi & Chen 2002: pl. 5, figs 1 and 9), and are of medium size.

References

CHEN D. & SHI C. 1982. - Latest Permian ostracoda from Nantong, Jiangsu and from Miannyang, Hubei. Bulletin of Nanjing Institute of Geology and Palaeontology Academia Sinica 4: 105 - 152.

CHEN D. & BAO H. 1986. - Lower Permian ostracodes from the Chihsia Formation of Jurong and Longtan, Jiangsu province. Acta Micropalaeontologica Sinica 3 (2): 107 - 132.

GUAN S., SUN Q., JIANG Y., LI L., ZHAO B., ZHANG X., YANG R. & FENG B. 1978. - Subclass Ostracoda, in Paleontological Atlas of Central and South China. Geological Publishing House, Beijing: 115 - 325 (in Chinese).

SHI C. G. & CHEN D. Q. 1987. - The Changhsingian ostracodes from Meishan, Chanxing, Zhejiang. Stratigraphy and palaeontology of Systemic boundary in China, Permian and Triassic Boundary 5: 23 - 80.

SHI C. G. & CHEN D. Q. 2002. - Late Permian ostracodes from Heshan and Yishan of Guangxi. Bulletin of Nanjing Institute Geology and Paleontology, Academia Sinica 15: 47 - 129 (in Chinese with English abstract).

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.