Bairdia fontainei Chitnarin 2017, n. sp.
Creators: name: Chitnarin, Anisong
name: Crasquin, Sylvie
name: Forel, Marie-Béatrice
name: Tepnarong, Prachya
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Ostracoda
Podocopida
Bairdiidae
Bairdia
Bairdia fontainei

description: Bairdia fontainei Chitnarin, n. sp.   
(Figs 3 G-H, K-L; 5)  
 Bairdia cf. piscariformis Chen in Chitnarin, Crasquin, Chonglakmani, Broutin, Grote & Thanee et al. 2008: 347, 349, fig. 6 (1-2). n. syn.   
TYPE MATERIAL. — Holotype, one complete carapace (SUT-09- 2187; Fig. 3G); paratypes, two complete carapaces (SUT-09-2182; Fig. 3H and SUT-09-2178; Fig. 3L).  
ETYMOLOGY. — In honour of Dr Henry Fontaine, France.  
MATERIAL EXAMINED. — Ten complete carapaces.  
DIMENSIONS. — H = 0.44-0.48 mm, L = 0.87-0.92 mm, H/L = 0.48- 0.53, Holotype: H = 0.55 mm, L = 1.02 mm; Paratype (Fig. 3H): H = 0.43, L = 0.87; Paratype (Fig. 3L): H = 0.44, L = 0.91 (Fig. 5).  
TYPE HORIZON. — Sample number 07LB05-5, Ta Kli section, Tak Fa Formation, Artinskian, Early Permian.  
TYPE LOCALITY. — Ta Kli section (15°19’05’’N, 100°22’46’’E), Nakhon Sawan Province, Central Thailand.  
 OCCURRENCES. — Sample 02TH46-07, Bung Sam Phan section, Tak Fa Formation, (Chitnarin et al. 2008), Phetchabun Province, Middle Permian, Central Thailand; sample 07LB05-05, Ta Kli section, Tak Fa Formation, Nakhon Sawan Province, Middle Permian, Central Thailand; sample 07 PB05-3, Ban Nean Sawan I section, Phetchabun Province, Tak Fa Formation, Middle Permian, Central Thailand; samples 07 PB04-2 and 07 PB04-5, Nong Phai section, Pha Nok Khao Formation, Phetchabun Province, Early Permian, Central Thailand.   
 DIAGNOSIS. — Species of Bairdia with spindle-shape carapace and a ventral ridge along VB of RV, DB and VB nearly straight and of equal length, H maximum at mid-L, distinct overlap of LV on RV at ADB and PDB.   
DESCRIPTION  
Spindle shape carapace in lateral view; DB and VB nearly straight and of equal length; at RV, ADB straight and has an angle of 150° with DB, ADB of LV slightly convex; AB rounded with medium radius of curvature, maximum convexity located at mid H; AVB of both valves straight, angle between AVB and VB is 150°; VB of RV slightly concave, VB of LV slightly concave to nearly straight; PVB of both valves straight, angle between PVB and VB is 150°; PB tapering, maximum convexity located at mid H; PDB of both valves straight, angle between PDB and DB is about 135°; surface smooth; presence of a ventral ridge along VB of RV; greatest H in the median region; LV strongly overlaps RV at ADB, PDB and VB, slightly overlaps at both ends.  
REMARKS  
 Bairdia fontainei Chitnarin, n. sp. includes the species identified as B. cf. piscariformis Chen, 1958 from the Middle Permian limestone in Phetchabun area (Chitnarin et al. 2008). However, it can be differentiated from B. piscariformis Chen, 1958 from the Early Permian of South China (Chen 1958: 245, pl. 4, figs 9-10) by the nearly straight DB and VB, the equal length of both valves, the straight AVB and PVB and the presence of ventral ridge on RV. B. fontainei Chitnarin, n. sp. is close to B. guadalupiana Hamilton, 1942 from the Middle Permian of Texas (Hamilton 1942) in general outline but the anterior part of the latter species is more rounded and with larger radius of curvature.
description: Published as part of 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, pp. 651-690 in Geodiversitas 39 (4) on pages 659-660, DOI: 10.5252/g2017n4a1, http://zenodo.org/record/4536112