Basslerella Kellett, 1935

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 : 680-681

Genus Basslerella Kellett, 1935

TYPE SPECIES. — Basslerella crassa Kellett, 1935 by original designation.

Basslerella wipanuae Chitnarin , n. sp. ( Figs 27 A-E; 28)

TYPE MATERIAL. — Holotype, complete carapace (SUT-09-2429, Fig.27A ); paratypes, two complete carapaces (SUT-09-2430; Fig.27B and SUT-09-2421; Fig. 27D ).

ETYMOLOGY. — In honour of Dr Wipanu Rukmai, Northeastern Research Institute of Petrified Wood and Mineral Resources, Nakhon Ratchasima Rajabhat University, Nakhon Ratchasima, Thailand.

MATERIAL EXAMINED. — 60 complete carapaces.

DIMENSIONS. — H = 0.28-0.36 mm, L = 0.36-0.48 mm, H/L = 0.70- 0.80, Holotype: H = 0.31 mm, L = 0.44mm; Paratype ( Fig. 27B ): H = 0.35, L = 0.48 mm; Paratype ( Fig. 27D ): H = 0.34 mm, L = 0.43 mm ( Fig. 28 ).

TYPE HORIZON. — Sample 07 PB 03-5, Khao Kana section, Pha Nok Khao Formation, Sakmarian, Early Permian.

TYPE LOCALITY. — Sample number 07 PB 03-5, Khao Kana section (16°04’12’’N, 100°54’20’’E), Pha Nok Khao Formation, Phetchabun province, central Thailand.

OCCURRENCES. — Sample 08LO07-10, Sak Chai Quarry section, Pha Nok Khao Formation , Chaiyaphum Province, northeastern Thailand, Early Permian ; samples 07 PB03-1 , 07 PB03-5 , Khao Kana section, Pha Nok Khao Formation, Phetchabun Province, central Thailand, Early Permian ; samples 07 PB04-2 , 07 PB04-5 , 07 PB04-7 , Nong Phai section, Pha Nok Khao Formation, Phetchabun Province, central Thailand, Early Permian ; sample 07 PB05-5 , Ban Naen Sawan I section, Tak Fa Formation , Phetchabun Province, central Thailand, Middle Permian ; sample 07LB04-8, Phu Lam Yai section, Tak Fa Formation , Nakhon Sawan province, central Thailand, Early Permian ; sample 07LB05-5, Ta Kli section, Tak Fa Formation, Nakhon Sawan province, central Thailand, Early Permian ; samples 07LB09-1, 07LB09-2, Khao Phu Chong Kho locality, Tak Fa Formation , Nakhon Sawan province, central Thailand, Early Permian .

DIAGNOSIS. — Species of Basslerella with triangular carapace, AB and PB round with nearly the same small radius of curvature, H max at mid L, faint striation with digital print aspect oriented from AD to PV on carapace surface.

DESCRIPTION

Carapace small, subtriagular; dorsal outline highly arched; DB short; ADB convex, forming in angle of 130° with DB; AB rounded with large radius of curvature, maximum convexity located at lower third of H; AVB short and convex; VB slightly convex; ventral laterally inflated; PVB short and convex; PB rounded with smaller radius of curvature, maximum convexity located ventrally, at lower fourth of H; PDB short; greatest H located at mid L; faint striation with digital print aspect developed on the surface oriented from AD to PV; in dorsal view, carapace biconvex with maximum thickness at mid lenght; LV larger and slightly overlaping RV all around the carapace.

REMARKS

Basslerella wipanuae Chitnarin , n. sp. is characterized by its diagnosis characters. The ornamentation is different from the reticulation of B. reticulata Shi, 1987 from the latest Permian of Meishan section, Zhejiang Province, East China ( Shi & Chen 1987: 55, pl. 17, figs 7-12). The more elliptical form of B. wipanuae is similar to B. annesophieae Crasquin, 2010 ( Crasquin et al. 2010a: 362-363, fig. 20N-V), but PDB of B. wipanuae is more rounded than in B. annesophieae .

Figures

FIG. 27. — 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, except K and L, are represented by complete carapaces. A-E, Basslerella wipanuae Chitnarin, n. sp.; A, holotype, right lateral view, SUT-09-2429, sample 07PB03-5; B, paratype, left lateral view, SUT-09-2430, sample 07PB03-5; C, ventral view, SUT-09-2426, sample 07PB04-2; D, paratype, right lateral view, SUT-09-2421, sample 07PB03-5; E, right lateral view, SUT-09-2425, sample 07PB04-2. F-J, Basslerella naresi Chitnarin,n. sp.; F, left lateral view,SUT-09-2486,sample 08LO02-1; G, holotype,left lateral view,SUT-09-2463,sample 08LO02-2;H, ventral view, SUT-09-2462, sample 08LO02-2; I, left lateral view, SUT-09-2461, sample 08LO02-2; J, left lateral view, SUT-09-2477, sample 07LB05-A2. K, L, Polycope sp.; K, SUT-09-2604, sample 07PB06-5; L, SUT-09-2606, sample 07PB06-5. M-P, Polycope sp.A; M, left lateral view, SUT-09-2610, sample 07PB04-2; N, left lateral view, SUT-09-2621, sample 08LO02-2;O, anterior view,SUT-09-2615,sample 07PB04-2;P, left lateral view, SUT-09-2627, sample 07LB05-B2.Q, R, Polycope sp. B; Q, left lateral view, SUT-09-2628, sample 08LO02-5; R, left lateral view, SUT-09-2630, sample 08LO02-5. S-U, Polycope sp.C; S, left lateral view, SUT-09-2644, sample 07LB09-1; T, left lateral view, SUT-09-2643, sample 07LB09-1; U, left lateral view, SUT-09-2642, sample 07LB09-1. Scale bars: 100 μm.

FIG. 28. — Height (H)-length (L) diagram of Basslerella wipanuae Chitnarin, n. sp. Scale bar: 100 µm.