Fabalicypris Cooper, 1946

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 : 672-675

Genus Fabalicypris Cooper, 1946

TYPE SPECIES. — Fabalicypris wileyensis Cooper, 1946 by original designation.

Fabalicypris hathaithipae Chitnarin , n. sp. ( Figs 16 C-F; 18)

TYPE MATERIAL. — Holotype, one complete carapace (SUT-09- 2341, Fig.16C ); paratypes, two complete carapaces (SUT-09-2348, Fig. 16D and SUT-09-2349, Fig. 16E ).

ETYMOLOGY. — In honour of Assistant Professor Dr Hathaithip Tassanapak, Department of Biology, Mahasarakham University, Thailand.

MATERIAL EXAMINED. — Twenty complete carapaces.

DIMENSIONS. — H = 0.31-0.46 mm, L = 0.66-1.02 mm, H/L = 0.41- 0.45, Holotype: H = 0.40 mm, L = 0.96 mm; Paratype ( Fig. 16D ): H = 0.42 mm, L = 0.92 mm; Paratype ( Fig. 16E ): H = 0.41 mm, L = 0.89 mm ( Fig. 18).

TYPE HORIZON. — Sample 07 PB 04-2, Nong Phai section, Pha Nok Khao Formation, Asselian-Sakmarian, Early Permian.

TYPE LOCALITY. — Nong Phai section (16°01’06’’N, 100°58’59’’E), Pha Nok Khao Formation, Phetchabun Province, central Thailand.

OCCURRENCES. — Sample 07 PB04-2 , Nong Phai section, Pha Nok Khao Formation , Phetchabun province, central Thailand, Early Permian ; sample 07LO07-8, Sak Chai Quarry section, Pha Nok Khao Formation , Chaiyaphum Province, northeastern Thailand, Early Permian ; sample 07LB05-5, Ta Kli section, Tak Fa Formation, Nakhon Sawan Province, central Thailand, Early Permian ; sample 07LB04-13, Phu Lam Yai section, Tak Fa Formation , Nakhon Sawan Province, central Thailand, Early Permian .

DIAGNOSIS. — Species of Bairdiacypris with maximum of convexity of AB and PB located just below mid H, angles of ADB and PDB with DB are of 140°, angles of ADB and PDB with DB are of 160°, maximum H located in front of mid L.

DESCRIPTION

Carapace long, subelliptical; dorsal outline broadly arched; DB straight, inclined rearward with an angle of 10°; ADB short, straight and angle with DB is 140°; AB rounded with medium radius of curvature, maximum convexity located below mid H (at 40-45%); AVB short and slightly convex; VB slightly concave, angle of AVB and VB is 160°; PVB slightly convex; PB round with medium radius of curvature, slightly smaller than AB, maximum convexity located at lower 30% of H; PDB short, straight, angle with DB is 140,° maximum H located in front of mid L, at antrior third of L; surface smooth.

REMARKS

Fabalicypris hathaithipae Chitnarin , n. sp. can be compared to Fabalicypris elliptica Chen, 1958 from the Early Permian of Jiangsu Province, Eastern China ( Chen 1958: 256, pl. VII,

figs 7-9) in lateral outline. Fabalicypris elliptica is distinct from the present new species by a more convex AVB and lower position of maximum of convexity of PB and maximum H located anteriorly at 30% of L. Futhermore, the long carapace, straight DB, developed PDB slope exhibited by F. elliptica are rather indicative of the genus Bairdiacypris , a revision of this species will be necessary.

Figures

FIG. 16. — 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 specimens are complete carapaces in right lateral view. A, Bairdiacypris sp. E, SUT-09-2357, sample 07PB03-1; B, Bairdiacypris deloi Bradfield, 1935, SUT-09-2360, sample 07PB05-6; C-F, Fabalicypris hathaithipae Chitnarin, n. sp.; C, holotype, SUT-09- 2341, sample 07PB04-2; D, paratype, SUT-09-2348, sample 07PB04-2; E, paratype, SUT-09-2349, sample 07PB04-2; F, SUT-09-2235, sample 08LO07-8; G-I, Cryptobairdia sp., G, SUT-09-2364, sample 08LO07-1; H, SUT-09-2362, sample 07P05-6; I, SUT-09-2363, sample 07P03-1; J, K, Bairdiacypris sp. F; J, SUT-09- 2366, sample 08LO07-2; K, SUT-09-2367, sample 08LO02-11; L, Bairdia sp. L, SUT-09-2369, sample 07PB08-2; M, Bairdiacypris sp. G, SUT-09-2370, sample 07PB03-7; N, Bairdiacypris sp. H, SUT-09-2372, sample 07LB04-13; O, Bairdia sp. M, SUT-09-2373, sample 07LB09-2. Scale bars: 100 μm.