Triadocypris tonkinensis ( Patte 1926 )

Kornicker, Louis S., Van, Barry W. M., Bakel, Fraaije, René H. B. & Jagt, John W. M., 2006, Revision of Mesozoic Myodocopina (Ostracoda) and a new genus and species, Mesoleberis hollandica, from the Upper Cretaceous of Belgium and The Netherlands, Zootaxa 1246, pp. 15-54 : 36-37

Triadocypris tonkinensis ( Patte 1926) (new combination)

Fig. 4 A, B

Cypridina tonkinensis Patte 1926:128 , pl. VIII: figs. 28–30; pl. IX, fig. 1.

Holotype

None selected.

Type locality

Khau Phai Shales, North Vietnam.

Material

No material examined herein.

Distribution

Khau Phai Shales, North Vietnam, Triassic.

Diagnosis

Oval in lateral view. Rostrum well developed, forming right angle with edge of valve ventral to rostrum, or slightly overhang incisure. Central adductor muscle scars with four oblique scars and additional scars.

Comparisons

Differs from M. hollandica in central adductor muscle scar pattern.

Remarks

Bless (1973:248) stated that this Triassic species may belong in his new genus Radiicypridina collected in the Upper Carboniferous, but the description by Patte (1926) did not permit a definite conclusion. The species is referred to Triadocypris herein, because its shape more closely resembles other species referred to that genus, and valves are without an indented incisure and caudal process generally present on species of Cypridina . The central adductor muscle scars are visible on illustrated specimens but are difficult to decipher.

Figures

FIGURE 4. Triadocypris tonkinensis (Patte 1926): A, B, left lateral views of carapace of two specimens, length ca. 10 mm).? Triadocypris sp. (Van Veen 1936): C, lateral view of anterior part left valve. Polycope antiqua (Herrig 1981): D, lateral view juvenile carapace, length 0.322 mm; E, lateral view carapace, length 0.294 mm). Polycope tenuireticulata (Herrig 1981): F, lateral view carapace, length 0.420 mm. Cypridina ocevjana Kittl 1918 (nomen dubium): G, left valve, lateral, posterior, and ventral views, length 8.3 mm. Cypridina infraoolithica Terquem 1885 (nomen dubium): H, left lateral and dorsal views of carapace, length 0.64 mm. Size of specimens given if stated in original description.