Baschkirina ruchae Chitnarin, 2017

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 : 678-679

Baschkirina ruchae Chitnarin , n. sp.

( Figs 24 A-D; 25)

TYPE MATERIAL. — Holotype, one complete carapace (SUT-09- 2375, Fig.24A ); paratypes, two complete carapaces (SUT-09-2374, Fig. 24C and SUT-09-2380, Fig. 24D ).

MATERIAL EXAMINED. — 17 complete carapaces.

DIMENSIONS. — H = 0.35-0.51 mm, L = 0.55-0.73 mm, H/L = 0.64- 0.69, Holotype: H = 0.51 mm, L = 0.74 mm; Paratype ( Fig. 24C ): H = 0.39 mm, L = 0.59 mm; Paratype ( Fig. 24D ): H = 0.53 mm, L = 0.82 mm ( Fig. 25 ).

TYPE HORIZON. — Sample 08LO02-2, Nam Maholan section, Nam Maholan Formation, Loei Province, Early Permian.

TYPE LOCALITY. — Sample 08LO02-2, Nam Maholan section (17°06’23’’N, 101°52’48’’E), Nam Maholan Formation, Loei Province, Early Permian.

DIAGNOSIS. — Species of Baschkirina with subtriangular carapace, highly arched dorsal outline, and AB laterally compressed with maximum convexity located below mid H, flanks subparallel in dorsal view.

DESCRIPTION

Carapace subtriangular; dorsal outline highly arched; DB straight and inclined at 30° rearward; ADB long, straight to slightly convex, with an angle of 120° with DB; PDB inclined sharply, making angle of 150° with DB; AB rounded with medium radius of curvature, maximum convexity located below mid H, and flattened laterally; AVB short; VB straight; PVB short; PB small, sub-spinose and located at or just above ventral level; LV slightly overlaps RV all around the carapace; greatest H located at mid L; in dorsal view, carapace thick, flanks subparallel and AB laterally compressed.

REMARKS

Baschkirina ruchae Chitnarin , n. sp. can be compared with B. buekkensis Kozur, 1985 from the Pennsylvanian of French Pyrénées and Bükk Mts, Hungary ( Kozur 1985b: 90-91, pl. 22, fig. 1); however, B. buekkensis is characterized by a smaller H, a longer DB and the position of maximum H in front of mid L. It can be differentiated from B. shii Kozur, 1985 from the Wuchiapingian of Bükk Mts, Hungary ( Kozur 1985a: 92, pl. 22, fig. 4) by an AB with smaller radius of curvature and strongly compressed laterally.

Figures

FIG. 24. — Ostracods from the limestones of the 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, Baschkirina ruchaeChitnarin, n. sp.; A, holotype, right lateral view, SUT-09-2375, sample 08LO02-2; B, dorsal view, SUT-09-2376, sample 08LO02-2; C, paratype, right lateral view, SUT-09-2374, sample 08LO02-2; D, paratype, right lateral view, SUT-09-2380, sample 08LO02-5; E-H, Basslerella tota Chen and Bao, 1986; E, right lateral view, SUT-09-2389, sample 07PB04-5; F, left lateral view, SUT-09-2387, sample 07LB04-8;G, left lateral view, SUT-09-2383, sample 07LB04-8;H, dorsal view,SUT-09-2385, sample 07LB04-8; I-L, Baschkirina cf. ballei Crasquin, 2010; I, right lateral view, SUT-09-2410, sample 08LO02-2; J, left lateral view, SUT-09-2414, sample 08LO02-2; K, dorsal view, SUT-09-2412,sample 08LO02-2; L, right lateral view, SUT-09-2405, sample 07PB04-5; M, N, Sulcella suprapermiana Kozur, 1985; M, right lateral view, SUT-09-2662, sample 07PB03-1; N, right lateral view, SUT-09-2664, sample 07PB03-3; O-R, Sulcella mesopermiana Kozur, 1985; O, right lateral view, SUT-09-2665,sample 08LB01-1; P, right lateral view,SUT-09-2666,sample 08LB01-1; Q, right lateral view, SUT-09-2676,sample 07PB03-1; R, right lateral view, SUT-09-2682, sample 07PB03-1. Scale bars: 100 μm.

FIG. 25. — Height (H)-length (L) diagram of Baschkirina ruchae Chitnarin,n. sp. Scale bar: 100 µm.