Reviya praecurukensis 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 : 198-200

Reviya praecurukensis Forel sp. nov.

Fig. 4A–H .

?2010 Indivisia cf. pelikani Kozur, 1985 ; Crasquin et al. 2010b: pl. 1: 8.

Etymology: In reference to Reviya curukensis Crasquin−Soleau, 2004 , which is close in shape and occurs later, in the Lower Triassic.

Type material: Holotype: one complete carapace, Fig. 4A , UPMC P6M2742 , sample 08BAN47 . Paratype: one complete carapace, Fig. 4B , UPMC P6M2743 , sample 08BAN47 .

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

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

Material.—42 complete and 6 broken carapaces, samples 08BAN47, 48, 50, 51, 56 (see Fig. 2B), levels 1, 2, 4, Nagyvisnyó Limestone Formation, Bálvány North section, Hungary, Changhsingian, Upper Permian.

Diagnosis.—A species of Reviya with a subquadrangular carapace, a straight to gently convex VB, a small shoulder in the posterodorsal part and an elongated pit near mid−H.

Dimensions (of adults).—L 425–800 µm, H 220–440 µm (see Fig. 3 ).

Description.—Carapace subrectangular; DB straight and long; ACA and PCA clear and more or less equivalent; AB with large radius of curvature and maximum of curvature located at mid−H; VB straight and long; PB with large radius of curvature, in all the cases a little smaller than AB, with maximum of curvature located above mid−H; presence of small shoulders in postero−dorsal part of the carapace; kirkbyan pit elongated and located at mid−H and mid−L; presence of a subventral ridge parallel to free margin; surface reticulated, on best preserved specimens nodes could be observed along free margins and DB; RV overlaps LV along free margins. Sexual dimorphism expressed in the heteromorphs by enlargement of posterior part of the carapace. Internal features unknown.

200 250 300 350 400 450 500 550 600 650 700 750 800 850 L (μm)

Discussion.— Reviya praecurukensis sp. nov. differs from Reviya curukensis Crasquin−Soleau, 2004 from the Griesbachian (Lower Triassic) of Western Taurus ( Turkey) (Crasquin−Soleau et al. 2004a, b) and Meishan GSSP ( China) (Crasquin et al. 2010a) by a more quadrangular carapace, a smaller H/L ratio and a straight VB at the RV. R. praecurukensis sp. nov. differs from the type species R. obesa (Croneis and Gale, 1939) , Lower Carboniferous of USA, by the absence of ridges and from R. mimicus ( Geis, 1932) , Lower Carboniferous of USA, by the central position of the

http://dx.doi.org/10.4202/app.2011.0126

pit and the reticulation which is not parallel to free margins. One specimen discovered in the Upper Permian of the Jadar Block in NW Serbia (Crasquin et al. 2010b) was attributed to Indivisia cf. pelikani Kozur, 1985 . This badly preserved specimen could belong to R. praecurukensis sp. nov.

Stratigraphic and geographic range.—Bálvány North section, levels 1, 2, 4, samples 08BAN47, 48, 50, 51, 56 (see Fig. 2B), Nagyvisnyó Limestone Formation, Changhsingian,?Upper Permian of Serbia.

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.

Fig. 3. Height/length diagram of Reviya praecurukensis Forel sp. nov.