Bairdia? huberti, 1844

Forel, Marie-Béatrice, 2012, Ostracods (Crustacea) associated with microbialites across the Permian-Triassic boundary in Dajiang (Guizhou Province, South China), European Journal of Taxonomy 19, pp. 1-34 : 11

Bairdia? huberti sp. nov.

Fig. 4 A-F

Diagnosis

Species attributed with doubt to the genus Bairdia , with relatively elongated carapace, ADB and DB not distinct, very large AB.

Etymology

Personal dedication to Hubert Colas.

Material examined

Holotype

One carapace ( Fig. 4D ), sample 05PAJ28, collection number P6M2942.

Paratype

One carapace ( Fig. 4C ), sample 05PAJ28, collection number P6M2941.

Other material

10 carapaces, several fragments. The species is known from its type locality only.

Type locality

Wujiaping Formation (samples 05PAJ20, 21, 23, 26-28), Dajiang section (25°33’56’’N- 106°39’41’’E), Guizhou Province, South China, Changhsingian, Late Permian.

Measurements ( Fig. 5 )

L = 581 – 837 μm; H = 332 – 512 μm; H/L = 0.53 – 0.64.

Description

Carapace relatively elongated, ovoid in lateral view; PDB long, straight to slightly convex; PDB-DB angle around 110°; DB and ADB not clearly distinct and along relative constant H, close to Hmax; VB concave; AVB rounded and long (~ 75% of Hmax); PVB very short and rounded; AB with large radius of curvature, maximum located on the upper 1/4 of H; PB with narrow radius of curvature, maximum located in the lower 1/4 of H; Lmax located around mid-H.

Remarks

High intraspecific variations that mainly affect the ADB and AB are observed in Bairdia ? huberti sp. nov. They create continuum between Cryptobairdia -like (ABD not distinct: Fig. 4 C-E) and Bairdia - like specimens (ABD differentiated: Fig. 4A, B, F ). The new species is therefore attributed with doubt to the genus Bairdia . Bairdia ? huberti sp. nov. is similar to Bairdia broutini Crasquin, 2010 from the Late Permian of the Meishan section, Zhejiang Province, South China ( Crasquin et al. 2010) because of the relative constant and high H. However, the new species is more elongated, with longer DB.

Figures

Fig. 4. Ostracods from the Dajiang section, South China. — A–F. Bairdia? huberti sp. nov. A. Carapace, right lateral view, P6M2939. B. Carapace, right lateral view, P6M2940. C. Paratype, carapace, right lateral view, P6M2941. D. Holotype, carapace, right lateral view, P6M2942. E. Carapace, right lateral view, P6M2943. F. Carapace, right lateral view, P6M2944. — G–P. Bairdia jeromei sp. nov. G. Holotype, carapace, right lateral view, P6M2945. H. Carapace, dorsal view, P6M2946. I. Carapace, right lateral view, P6M2947. J. Paratype, carapace, right lateral view, P6M2948. K. Carapace, right lateral view, P6M2949. L. Carapace, right lateral view, P6M2950. M. Carapace, right lateral view, P6M2951. N. Carapace, right lateral view, P6M2952. O. Carapace, right lateral view, P6M2953. P. Carapace, right lateral view, P6M2954. — Q–T. Bairdia limatusformis Forel, 2010. Q. Carapace, right lateral view, P6M2955. R. Carapace, left lateral view, P6M2956. S. Carapace, sub-dorsal view, P6M2957. T. Carapace, right lateral view, P6M2958. — U–V. Bairdia sp. 1. U. Carapace, right lateral view, P6M2959. V. Carapace, right lateral view, P6M2960. — W–X. Bairdia sp. 2. W. Carapace, dorsal view, P6M2961. X. Carapace, right lateral view, P6M2962. – Scale = 100 µm.

Fig. 5. Height/length diagram of Bairdia?huberti sp. nov.