Eumiraculum desmaresae 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 : 211-212

Eumiraculum desmaresae Forel sp. nov.

Figs. 18I–L , 19 .

Etymology: Dedicated to Dr.Delphine Desmares (UPMC,Paris, France).

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

Type material: Holotype: one complete carapace, Fig. 18J , UPMC P6M2909 , sample 08BAN47 . Paratype: one complete carapace, Fig. 18K , UPMC P6M2910 , sample 08BAN47 .

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

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

Material.—6 complete and 1 broken carapaces, sample 08BAN47 (see Fig. 2B), level 1, Nagyvisnyó Limestone Formation, Bálvány North section, Hungary, Changhsingian, Upper Permian.

Diagnosis.—A species of Eumiraculum with a small PB, strong overlap of the LV on the RV and a ornamentation very subtle. Dimensions.—L 210–360 µm; H 135–205 µm (see Fig. 19 ).

Description.—Carapace massive, strongly inequivalve, ornamentation very subtle on lateral surface of valves; maximum of overlap (LV on RV) at anterior part of DB and VB. LV: DB convex, ACA distinct (about 90°) identical to ACA of RV; PCA not marked; AB regularly rounded, in this part RV overlaps LV; VB convex; PB with small radius of curvature. Internal features unknown. RV: DB concave to straight; ACA(?) well expressed (about 90°) and underlain by a small “spine”; AB with large radius of curvature, maximum of convexity located at mid−H, contact with VB angular (a little more than 90°); VB slightly convex; PB with small radius of curvature and maximum of convexity located above mid−H; link with DB (PCA?) less pronounced than anterior one, small “spine” not clearly visible; RV overlapped by LV all around the carapace except at AB where the overlap is reversed.

Discussion.— Eumiraculum desmaresae sp. nov. looks like Eumiraculum changxingensis Chen, 1987 from the Upper Changhsingian of Meishan section ( Shi and Chen 1987; Crasquin et al. 2010a). At E. desmaresae sp. nov. the PB has a smaller radius of curvature, the overlap of the LV on the RV is less significant and the ornamentation is poorly expressed.

Stratigraphic and geographic range.—Bálvány North section, level 1, sample 08BAN47 (see Fig. 2B), Nagyvisnyó Limestone Formation, Changhsingian, Upper Permian.

Figures

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.

Fig. 19. Height/length diagram of Eumiraculum desmaresae Forel sp. nov.