Acratia nagyvisnyoensis Forel, 2013

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 : 204-205

Acratia nagyvisnyoensis Forel sp. nov.

Fig. 10K–O .

Etymology: In reference to the occurrence of the species in the Nagyvisnyó Limestone Formation.

Type material: Holotype: one complete carapace, Fig. 10K , UPMC P6M2813 , sample 08BAN47 . Paratype: one complete carapace, Fig. 10L , UPMC P6M2814 , sample 08BAN47 .

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

Type horizon: Level 1, Nagyvisnyó Limestone Formation , Changhsingian (Upper Permian) .

Material.—7 complete and 5 broken carapaces, samples 08BAN47, 48, 50, 53, and 54 (see Fig. 2B), levels 1, 3, 4, Nagyvisnyó Limestone Formation, Bálvány North section, Hungary, Changhsingian (Upper Permian).

Diagnosis.—A species of Acratia with laterally flattened extremities, a Bairdia − type PB, and a fairly symmetrical carapace in lateral view with Hmax located at midL.

Dimensions.—L 550–610 µm; H 300–310 µm.

Description.—Lateral carapace outline subsymmetrical, Hmax located at midL; DB regularly arched at both valves; ADB and PDB quite straight to gently convex; AB with small radius of curvature, quite vertical; anterior acratian beak poorly expressed; VB convex at LV, straight to gently convex at RV; Bairdia − type PB, with maximum of curvature located at lower 1/3rd of H; LV overlaps RV all around the carapace with maximum at VB; both extremities laterally flattened. Internal features unknown.

Discussion.— Acratia nagyvisnyoensis sp. nov. is similar to Acratia subfusiformis Wang, 1978 from Wuchiapingian and Changhsingian of Southern China: Guizhou and Yunnan ( Wang 1978), Guangxi ( Shi and Chen 2002), and Meishan GSSP section, Zhejiang (Crasquin et al. 2010a). The PB are very similar in the two species. In A. nagyvisnyoensis sp. nov., the maximum of curvature is located lower, the Hmax is located more posteriorly and the VB is more convex. A. nagyvisnyoensis sp. nov. is also close to Acratia zhongyingensis Wang, 1978 from Wuchiapingian and Changhsingian of Southern China: Guizhou and Yunnan ( Wang 1978), Guangxi ( Shi and Chen 2002), and Meishan GSSP section, Zhejiang (Crasquin et al. 2010a), and from the Changhsingian of Bulla section, Italy (Crasquin et al. 2008). Both species have laterally flattened extremities. In A. nagyvisnyoensis sp. nov. the DB is more convex, more symmetrical in lateral view and shows a greater overlap.

Stratigraphic and geographic range.—Bálvány North section, levels 1, 3, 4, samples 08BAN47, 50, 53, and 54 (see Fig. 2B), Nagyvisnyó Limestone Formation, Changhsingian, Upper Permian.

Figures

Fig. 10. Ostracods from Bálvány North section, Bükk Mountains, Hungary. Right lateral views of complete carapaces. A–J. Acratia? jeanvannieri Forel sp. nov., Griesbachian, Lower Triassic. A. Holotype, UPMC P6M2803, sample 08BAN61. B. Paratype, UPMC P6M2804, sample 08BAN63. C. UPMC P6M2805, sample 08BAN63. D. UPMC P6M2806, sample 08BAN63. E. UPMC P6M2807, sample 08BAN61. F. UPMC P6M2808, sample 08BAN61. G. UPMC P6M2809, sample 08BAN63. H. UPMC P6M2810, sample 08BAN63. I. UPMC P6M2811, sample 08BAN62. J. UPMC P6M2812, sample 08BAN62. K–O. Acratia nagyvisnyoensis Forel sp. nov., Changhsingian, Upper Permian. K. Holotype, UPMC P6M2813, sample 08BAN47. L. Paratype, UPMC P6M2814, sample 08BAN47. M. UPMC P6M2815, sample 08BAN47. N. UPMC P6M2816, sample 08BAN47. O. UPMC P6M2817, sample 08BAN54. P, T. Acratia sp. A, Changhsingian, Upper Permian. P. UPMC P6M2818, sample 08BAN47. T. UPMC P6M2819, sample 08BAN47. Q. Acratia sp. B, Changhsingian, Upper Permian. UPMC P6M2820, sample 08BAN47. R, S. Acratia sp. C, Changhsingian, Upper Permian. R. UPMC P6M2821, sample 08BAN50. S. UPMC P6M2822, sample 08BAN52. Scale bars 100 µm.