Bairdia anisongae 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 : 201-203

Bairdia anisongae Forel sp. nov.

Figs. 6N–P , 7 .

Etymology: Dedicated to Dr. Anisong Chitnarin (Suranaree University of Technology, Nakhon Ratchasima, Thailand).

Type material: Holotype: one complete carapace, Fig. 6N , UPMC P6M2774 , sample 08BAN55 . Paratype: one complete carapace, Fig. 6O , UPMC P6M2775 , sample 08BAN62 .

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

Type horizon: Level 4, Nagyvisnyó Limestone Formation , Changhsingian, Upper Permian .

Material.—Three complete and four broken carapaces, samples 08BAN47, 55 and 62 (see Fig. 2B), levels 1, 4, 8, Nagyvisnyó and Gerennavár Limestone Formations, Bálvány North section, Hungary, Changhsingian to Griesbachian, Upper Permian–Lower Triassic.

Diagnosis.—A species of Bairdia with straight PDB, DB, and ADB, with narrow AB and almost parallel AVB and PDB.

Dimensions.—L 210–325 µm; H 120–200 µm (see Fig. 7 ).

Description.—Carapace quite high (H/L 0.57–0.63), with straight DB, PDB, and ADB at both valves; DB steeply inclined backwards; AB with small radius of curvature and maximum of convexity located high (above mid−H); AVB

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

straight and long, almost parallel to PDB; VB long and quite straight at both valves; PB with small radius of curvature with maximum of convexity located low (lower than 1/5 th of H); PDB straight and long at both valves; Hmax located a little in front of mid−L; LV overlaps RV very faintly all around the carapace with a maximum at DB, carapace biconvex and thin in dorsal view. Internal features unknown.

Discussion.— Bairdia anisongae sp. nov. shows the same angularity between dorsal parts (PDB/DB/ADB) as Bairdia wushunbaoi Crasquin, 2010 and Bairdia paussi Crasquin, 2010 both from Changhsingian of Meishan section (Crasquin et al. 2010a). In B. wushunbaoi the AB is narrower and its maximum of curvature is located higher. B. paussi has a more elongated carapace with a less strongly inclined DB. Bairdia anisongae sp. nov. differs from B. wailiensis Crasquin−Soleau, 2006 from the Lower Triassic of Guangxi (Crasquin−Soleau et al. 2006) (see Fig. 5J–M ) in its more distinct dorsal parts, its more tapering PB and the smaller radius of curvature of AB.

Stratigraphic and geographic range.—Bálvány North section, levels 1 to 8, samples 08BAN47, 55 and 62 (see Fig. 2B), Nagyvisnyó and Gerennavár Limestone Formations, Changhsingian to Griesbachian, Upper Permian to Lower Triassic.

Figures

Fig. 6. Ostracods from Bálvány North section, Hungary (except A–D from Bulla section, Northern Italy). Right (A, E, G–W) and left (B, C, D, F) lateral views of complete carapaces. A–G. Langdaia bullabalvanyensis Crasquin sp. nov., Griesbachian, Lower Triassic. A. Holotype, UPMC P6M2762, sample 05BU19. B. Paratype, UPMC P6M2763, sample 05BU19. C. UPMC P6M2232, sample 05BU19. D. UPMC P6M2764, sample 05BU19. E. UPMC P6M2765, sample 08BAN67. F. UPMC P6M2766, sample 08BAN67. G. UPMC P6M2767, sample 08BAN67. H, I. Bairdia baudini nom. nov. H. UPMC P6M2785, sample 08BAN48, Changhsingian, Upper Permian. I. UPMC P6M2786, sample 08BAN61, Griesbachian, Lower Triassic. J–M. Bairdia wailiensis Crasquin−Soleau, 2006, Griesbachian, Lower Triassic. J. UPMC P6M2770, sample 08BAN62. K. UPMC P6M2771, sample 08BAN47. L. UPMC P6M2772, sample 08BAN62. M. UPMC P6M2773, sample 08BAN62. N–P. Bairdia anisongae Forel sp. nov. N. Holotype, UPMC P6M2774, sample 08BAN55, Changhsingian, Upper Permian. O. Paratype, UPMC P6M2775, sample 08BAN62, Grisbachian, Lower Triassic. P. UPMC P6M2776, sample 08BAN47, Changhsingian, Upper Permian. Q–U. Bairdia davehornei Forel sp. nov., Griesbachian, Lower Triassic. Q. Holotype, UPMC P6M2777, sample 08BAN61. R. Paratype, UPMC P6M2778, sample 08BAN62. S. UPMC P6M2779, sample 08BAN62. T. UPMC P6M2780, sample 08BAN62. U. UPMC P6M2781, sample 08BAN62. V, W. Bairdia cf. Bairdia davehornei Forel sp. nov., Griesbachian, Lower Triassic. V. UPMC P6M2782, sample 08BAN62. W. UPMC P6M2783, sample 08BAN61. Scale bars 100 µm.

Fig. 7. Height/length diagram of Bairdia anisongae Forel sp. nov.

Fig. 5. Height/length diagram of Langdaia bullabalvanyensis Crasquin sp. nov.