Hungarella tulongensis Crasquin, 2011

Forel, Marie-Béatrice & Crasquin, Sylvie, 2011, In the aftermath of Permian-Triassic boundary mass-extinction: new ostracod (Crustacea) genus and species from South Tibet, Geodiversitas 33 (2), pp. 247-263 : 256-258

Hungarella tulongensis Crasquin n. sp. ( Fig. 8 A-F)

TYPE MATERIAL. — Holotype (P6M2662): one complete carapace ( Fig. 8A ); paratype (P6M2666): one complete carapace ( Fig. 8D ).

ETYMOLOGY. — From the Tulong section, type locality.

MATERIAL EXAMINED. — 230 complete carapaces and 18 isolated valves.

DIMENSIONS. — L = 380-570 µm; H = 240-350 µm. Holotype: L = 506 µm; H = 316 µm. Paratype: L = 514 µm; H = 308 µm.

TYPE HORIZON. — Unit V,Tulong Formation, Spathian, lower Triassic.

TYPE LOCALITY. — Tulong section, Southern Tibet .

OCCURRENCE. — Tulong section, SouthernTibet. Samples 06Ti20, 06Ti25, 06Ti26, 06Ti28-32 and 06Ti34, units V and VI, Spathian-Anisian, Early-Middle Triassic.

DIAGNOSIS. — A species of Hungarella with dorsal parts straight and carapace laterally compressed at AB.

DESCRIPTION

PD and AD parts long and straight on RV, straight to gently convex on LV; the two parts are at a 140-150° angle; AB regularly arched with a clear lateral flattening, maximum of convexity located around mid-H; VB regularly convex on both valves; PB with quite large radius of curvature, maximum of curvature located a little below mid-H; carapace subtriangular with maximum of H at mid-L or a little in front of; H/L = 0.62;

lateral view of a complete carapace (P6M2627); E, right lateral view of a broken carapace (P6M2628); F -H, Bairdiacypris combeae Forel n. sp.; F, holotype (P6M2626), right lateral view of a right valve; G, left lateral view of a complete carapace (P6M2625); H, paratype (P6M2624), left lateral view of left valve; I, Microcheilinella sp. A, right lateral view of left valve (P6M2629); J -M, Triassicindivisia tibetinella Crasquin n. gen., n. sp.; J, holotype (P6M2631), left lateral view of a complete carapace; K, paratype (P6M2632), left lateral view of a complete carapace; L, left lateral view of a complete carapace (P6M2636); M, left lateral view of a complete carapace (P6M2637). Scale bars: 100 μm.

LV overlap of LV on RV very weak all around the margins; surface smooth.

REMARKS

Hungarella tulongensis Crasquin n. sp. differs from the Upper Anisian species “ Hungarella ” reniformis Méhes, 1911 from Lake Balaton ( Hungary; Méhes 1911; Monostori 1995) by H/L smaller and a maximum of convexity of BP located lower. Hungarella elongata (Blake, 1876) from the Late Triassic (Rhaetian) of Great Britain ( Anderson 1964) has the same anterior structure but the dorsal outline is less angular and H/L is smaller. Hungarella ovata Zheng, 1976 from the Rhaetian of South China ( Zheng 1976) is also relatively close to the new species but has a concave VB on RV and a PB with smaller radius of curvature ( Hungarella genus needs re-collection and re-description).

Order PALAEOCOPIDA Henningsmoen, 1953 Superfamily indet. Family indet.

Figures

FIG. 8. — Specimens from Tulong section (Tibet), stored at the Pierre et Marie Curie University Collections (Paris, France): A-F, Hungarella tulongensis Crasquin n. sp.; A, holotype (P6M2662), right lateral view of a complete carapace; B, right lateral view of a complete carapace (P6M2663); C, right lateral view of a complete carapace (P6M2665); D, paratype (P6M2666), right lateral view of a complete carapace; E, right lateral view of a complete carapace (P6M2667); F, right lateral view of a complete carapace (P6M2661); G, Hun-