Liuzhinia larmae Forel, 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 : 254-256

Liuzhinia larmae Forel n. sp. ( Fig. 6 C-G)

TYPE MATERIAL. — Holotype: one complete carapace (P6M2638; Fig. 6C ); paratype: one complete carapace (P6M2639; Fig. 6D ).

F, Bairdia anisica Kozur, 1970 , right lateral view of a complete carapace (P6M2613); G, Bairdia ? sp. D, left lateral view of a complete carapace (P6M2614); H, Bairdia cf. finalyi ( Méhes, 1911) , right lateral view of a broken carapace (P6M2620); I -M, Petasobairdia collini Forel n. sp.; I, right lateral view of a complete carapace (P6M2617); J, paratype (P6M2619), right lateral view of a nearly complete carapace (dorsal part of left valve is missing); K, right lateral view of a nearly complete carapace (P6M2613); L, right lateral view of a complete carapace (P6M2618); M, holotype (P6M2615), right lateral view of a complete carapace. Scale bars: 100 μm.

ETYMOLOGY. — Dedicated to Kriemhilde Larm, personal dedication.

MATERIAL EXAMINED. — 32 complete carapaces and 1 isolated valve.

DIMENSIONS. — L = 350-570 µm; H = 175-290 µm. Holotype: L = 406 µm; H = 200 µm. Paratype: L = 388 µm; H = 206 µm.

TYPE HORIZON. — Sample 06Ti08, Unit IIIb, Tulong Formation, Smithian, Lower Triassic.

TYPE LOCALITY. — Tulong section, Southern Tibet .

OCCURRENCE. — Tulong section, Southern Tibet . Samples 06Ti06, 06Ti08, 06Ti13, 06Ti14 and 06Ti32, units III to VI, Smithian-Anisian, Early-Middle Triassic.

DIAGNOSIS. — A Liuzhinia species with long and straight dorsal border; AB and PB with small radius of curvature.

DESCRIPTION

DB long and straight; AB with relatively small radius of curvature; VB long and gently convex on both valves; PB with small radius of curvature; AB and PB gently compressed laterally at the extremities of the carapace; maximum of H located in front of L anterior third; H/L = 0.51

REMARKS

Liuzhinia larmae Forel n. sp. is very close from Liuzhinia antalyaensis Crasquin-Soleau, 2004 from the early Induan of the Western Taurus ( Turkey, Crasquin-Soleau et al. 2004), Guangxi, South China (Crasquin-Soleau et al. 2006) and Southern Alps, Italy ( Crasquin et al. 2008). Here, the radius of curvature of AB is smaller, the DB is shorter, the H/L ratio is smaller and the thickness is less important in posterior part of the carapace.

NB: in Crasquin-Soleau et al. (2004: 286), there is a printing mistake in the diagnosis of Liuzhinia antalyaensis . It should be as follows:

DIAGNOSIS. — Species of Liuzhinia with long straight dorsal border and maximum of height located in the anterior third.

Figures

FIG. 6. — Specimens from Tulong section (Tibet), stored at the Pierre et Marie Curie University Collections (Paris, France): A, Microcheilinella sp. C, right lateral view of a complete carapace (P6M2635); B, Liuzhinia sp. B, right lateral view of a complete carapace (P6M2634);C-G, Liuzhinia larmae Forel n. sp.;C, holotype (P6M2638),right lateral view of a complete carapace;D, paratype (P6M2639), right lateral view of a complete carapace; E, left lateral view of a complete carapace (P6M2640); F, right lateral view of a complete carapace (P6M2641); G, left lateral view of a complete carapace (P6M2642); H, Acratia cf. symmetrica Hao, 1992, right lateral view