Bythocytheridae Sars, 1926

Forel, Marie-Béatrice, Crasquin, Sylvie, Hips, Kinga, Kershaw, Steve, Collin, Pierre-Yves & Haas, János, 2013, Biodiversity evolution through the Permian-Triassic boundary event: Ostracods from the Bükk Mountains, Hungary, Acta Palaeontologica Polonica 58 (1), pp. 195-219 : 210-211

Family Bythocytheridae Sars, 1926 Genus Callicythere Wei, 1981

Type species: Callicythere emeiensis Wei, 1981 ; Lower Triassic , Sichuan Province, China

Callicythere ? balvanyseptentrioensis Forel sp. nov. Figs. 17 , 18A–H .

Etymology: Latinization of Bálvány North section.

Type material: Holotype: one complete carapace, Fig. 18A , UPMC P6M2900 , sample 08BAN62 . Paratype: one complete carapace, Fig. 18B , UPMC P6M2901 , sample 08BAN61 .

Type locality: Bálvány North section, Bükk Mountains, Hungary .

Type horizon: Level 8, Gerennavár Limestone Formation , Griesbachian, Lower Triassic .

Material.—44 complete and 11 broken carapaces, samples 08BAN47, 50, 59, 61, 62, 63, 64, 67, and 69 (see Fig. 2B), levels 1, 5, 7, 8, Nagyvisnyó and Gerennavár Limestone Formations, Bálvány North section, Hungary, Changhsingian to Griesbachian, Upper Permian–Lower Triassic.

Diagnosis.—A species attributed with doubt to Callicythere with a small radius of curvature at the PB, without S 2 and dorsolateral furrow.

Dimensions.—L 180–345 µm; H 110–210 µm (see Fig. 17 ). Description.—Carapace quite equivalve with surface smooth without S 2 nor narrow furrow; sexual dimorphism is well−expressed. Heteromorphs: DB convex; AB laterally compressed with large radius of curvature and maximum of convexity located at or below mid−H; VB straight and overreached by posteroventral wing−like inflation; PB laterally flattened with quite large radius of curvature and maximum of convexity located at or below mid−H; Hmax located at anterior part of DB. Tecnomorphs: DB straight to gently convex; AB laterally compressed with large radius of curvature and maximum of convexity located at or below mid−H; VB as in females; PB as in females but with smaller radius of curvature; Hmax located at anterior part of DB; carapace in dorsal view thinner than females. Internal features unknown.

Discussion.— Wei (1981) included the genus Callicythere in

160 180 200 220 240 260 280 300 320 340 360 L (μm)

the Family Cytherissinellidae Kashevarova, 1958 . It seems that this attribution is due to the similarity between Callicythere and Lutkevichinella Schneider, 1956 (for discussion see Wei 1981: 506). The description of the Family Cytherissinellidae is: “elongate suboblong, dorsal margin straight, anterior and posterior ends rounded, with faint to distinct narrow sulcus extending straight downward from mid−dorsal region; surface reticulated and may bear inconspicuous longitudinal ribs.” ( Moore 1961: Q290–Q292). In the description of Callicythere, Wei (1981) pointed out “… shallow V−shaped depression, on mid−dorsal region”. Because of this “V−shaped depression”, close to a true S 2, and the presence of latero−ventral structures we attribute this genus to the Bythocytheridae Sars, 1926 . The doubt about the generic attribution of our new species is due to the absence (or non−preservation?) of a dorso−median depression or sulcus.

Callicythere ? balvanyseptentrioensis sp. nov. is close to Callicythere postiangusta Wei, 1981 from the Lower Triassic of Emei (Sichuan, South China; Wei 1981). The latter species has a PB with a larger radius of curvature and less distinct ACA.

Stratigraphic and geographic range.—Bálvány North section, levels 1, 5, 7, 8, samples 08BAN47, 50, 59, 61, 62, 63, 64, 67, and 69 (see Fig. 2B), Nagyvisnyó and Gerennavár Limestone Formations, Changhsingian to Griesbachian, Upper Permian to Lower Triassic.

Figures

Fig. 17. Height/length diagram of Callicythere? balvanyseptentrioensis Forel sp. nov.

Fig. 18. Ostracods from Bálvány North section, Bükk Mountains, Hungary. Right (A, B, D, E, G–P) and left (C, F) lateral views of complete carapaces. A–H. Callicythere? balvanyseptentrioensis Forel sp. nov., Griesbachian, Lower Triassic. A. Holotype, UPMC P6M2900, sample 08BAN62. B. Paratype, UPMC P6M2901, sample 08BAN61. C. UPMC P6M2902, sample 08BAN62. D. UPMC P6M2903, sample 08BAN62. E. UPMC P6M2904, sample 08BAN62. F. UPMC P6M2905, sample 08BAN63. G. UPMC P6M2906, sample 08BAN64. H. UPMC P6M2907, sample 08BAN62. I–L. Eumiraculum desmaresae Forel sp. nov., Changhsingian, Upper Permian. I. UPMC P6M2908, sample 08BAN47. J. Holotype, UPMC P6M2909, sample 08BAN47. K. Paratype, UPMC P6M2910, sample 08BAN47. L. UPMC P6M2911, sample 08BAN47. M. Sulcella? sp., UPMC P6M2916, sample 08BAN67, Griesbachian, Lower Triassic. N. Eumiraculum cf. Eumiraculum desmaresae Forel sp. nov., UPMC P6M2912, sample 08BAN67, Griesbachian, Lower Triassic. O, P. Cetollina? sp. A. O. UPMC P6M2913, sample 08BAN59, Changhsingian, Upper Permian. P. UPMC P6M2914, sample 08BAN66, Griesbachian, Lower Triassic. Scale bars 100 µm.