Shemonaella, Sohn, 1971

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 : 200-201

Shemonaella ? olempskaella Forel sp. nov.

Fig. 4Q–T .

Etymology: Dedicated to Professor Ewa Olempska (Institute of Paleobiology PAS, Warsaw, Poland).

Type material: Holotype: one complete carapace, Fig. 4Q , UPMC P6M2758 , sample 08BAN48 . Paratype: one complete carapace, Fig. 4R , UPMC P6M2759 , sample 08BAN47 .

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

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

Material.—6 complete carapaces, samples 08BAN47, 48, 55, 60 (see Fig. 2B), levels 1, 4, 6, Nagyvisnyó Limestone Formation, Bálvány North section, Changhsingian, Upper Permian.

Diagnosis.—A species of Shemonaella with long carapace (H/L 0.57) and long straight VB.

Dimensions.—L 240–450 µm; H 140–250 µm.

Description.—Carapace long for the genus (H/L 0.57), DB straight; ACA 125–135°; AB with quite large radius of curvature, maximum at mid−H or little above; VB long and straight (looks curved); the posterior extensions of DB and VB make an angle of 10°; PB with medium radius of curvature and maximum curvature located at 2/3 of H; PCA between 135° and 145°; LV overlaps RV all along free margin; surface smooth. Internal features unknown.

Discussion.—The genus Shemonaella is a typically Carboniferous genus and is rare in the Upper Permian. At present, only one species is reported in the literature ( Shemonaella sp. 1 ; Crasquin et al. 2010a: fig. 4K, L). Shemonaella ? olempskaella sp. nov. differs from Shemonaella sp. 1 sensu Crasquin et al. 2010a from the Upper Permian of Meishan section in South China in its more elongated and preplete carapace. The closest species in shape is Shemonaella dutroi Sohn, 1971 from Lower Carboniferous of Alaska ( Sohn 1971). Here the VB is straighter and the carapace longer.

Stratigraphic and geographic range.—Bálvány North section, levels 1, 4, 6, samples 08BAN47, 48, 55, 60 (see Fig. 2B), Nagyvisnyó Limestone Formation, Changhsingian, Upper Permian.

Figures

Fig. 4. Ostracods from Bálvány North section, Bükk Mountains, Hungary. Left (A, D–G, N–O) and right (B, M, P–S) lateral views of complete carapaces, external views of a left (J, L, V) and right (I, K, U) valves. A–H. Reviya praecurukensis Forel sp. nov., Changhsingian, Upper Permian. A. Holotype, UPMC P6M2742, sample 08BAN47. B. Paratype, UPMC P6M2743, sample 08BAN47. C. UPMC P6M2744, sample 08BAN47. D. UPMC P6M2745, sample 08BAN47. E. UPMC P6M2746, sample 08BAN47. F. UPMC P6M2747, sample 08BAN47. G. UPMC P6M2748, sample 08BAN47. H. UPMC P6M2749, sample 08BAN52. I–L. Hollinella fengqinglaii Crasquin sp. nov., Changhsingian, Upper Permian. I. Holotype, UPMC P6M2750, sample 08BAN50. J. Paratype, UPMC P6M2751, sample 08BAN60. K. UPMC P6M2752, sample 08BAN56. L. UPMC P6M2753, sample 08BAN60. M–O. Samarella meishanella Forel, 2010, Changhsingian, Upper Permian. M. UPMC P6M2754, sample 08BAN56. N. UPMC P6M2755, sample 08BAN63. O. UPMC P6M2756, sample 08BAN63. P.?Samarella victori Crasquin, 2010a, UPMC P6M2757, sample 08BAN56, Changhsingian, Upper Permian. Q–T. Shemonaella? olempskaella Forel sp. nov., Changhsingian, Upper Permian. Q. Holotype, UPMC P6M2758, sample 08BAN48. R. Paratype, UPMC P6M2759, sample 08BAN47. S. UPMC P6M2760, sample 08BAN47. T. UPMC P6M2761, sample 08BAN47.U, V. Reviya curukensis Crasquin−Soleau, 2004, Griesbachian, Lower Triassic. U. UPMC P6M2862, sample 08BAN65. V. UPMC P6M2862, sample 08BAN65. Scale bars 100 µm.