Vaugonia (Orthotrigonia) sp.

Fuersich, Franz T., Alberti, Matthias, Pandey, Dhirendra K. & Ayoub-Hannaa, Wagih S., 2022, Jurassic bivalves from the Spiti area of the Himalayas, northern India, Zitteliana 96, pp. 153-178 : 153

Vaugonia (Orthotrigonia) sp.

Plate 4, fig. 9

Material.

A single poorly preserved right valve from the lower member at Langza (SNSB-BSPG 2020 XCIX 25).

Description and remarks.

The specimen (H: 22.7 mm, L: 24.5 mm) exhibits the typical ornamentation of Orthotrigonia such as steep subvertical tuberculated ribs on the flank, commarginal tuberculated to spinose ribs in the umbonal area, a tuberculated marginal carina, and a commarginally striated area. The specimen resembles V. (Orthotrigonia) kutchensis (Kitchin, 1903: 84, pl. 8, figs 7-9) from the Kachchh Basin, but due to its poor preservation an identification at the species level is not possible.

Clade Heterodonta Neumayr, 1884

Order Carditida Dall, 1889

Figures

Plate 4. (1) Camptonectes (Camptochlamys) sp. from the upper member close to Demul Pass (SNSB-BSPG 2020 XCIX 14). (2) Chlamys (Chlamys) cf. textoria (Schlotheim, 1820). Incomplete right valve from the lower member at Langza (SNSB-BSPG 2020 XCIX 11). (3) Spondylopecten (Plesiopecten) subspinosus (Schlotheim, 1820). Internal mould of right valve from the lower member at the Kaza-Hikkim road (SNSB-BSPG 2020 XCIX 23). (4) Radulopecten cf. fibrosus (J. Sowerby, 1816). a, b, Fragment of a right valve from the? lower member near Demul (SNSB-BSPG 2020 XCIX 39). (5) Pectinidae indet. Slightly distorted internal mould of a single valve from the lower member along the Kazan-Hikkim road (SNSB-BSPG 2020 XCIX 17). (6) Plagiostoma? sp. B. Strongly crushed single valve with remains of shell from the lower member at Langza (SNSB-BSPG 2020 XCIX 35). (7) Plagiostoma? sp. A. a, b, Fragmented left internal mould with remains of the inner shell layer from the Ferruginous Oolite Formation near Zangla (SNSB-BSPG 2020 XCIX 36). (8) Trigonia? sp. Right internal mould from the top of the Ferruginous Oolite Formation at Zangla (SNSB-BSPG 2020 XCIX 24). (9) Vaugonia (Orthotrigonia) sp. Poorly preserved right valve from the lower member at Langza (SNSB-BSPG 2020 XCIX 25). (10 - 13) Pruvostiella (Pruvostiella) hermanni (Oppel, 1863). 10. Hinge of left valve from the lower member close to the pass to Tashigeng; Aa, anterior adductor scar; Apr, anterior pedal retractor scar (SNSB-BSPG 2020 XCIX 54 b). 11. Hinge of left valve from the lower member at the Kaza-Hikkim road cut; Cpr, central pedal retractor scar (SNSB-BSPG 2020 XCIX 59). 12. Hinge of right valve from the lower member close to the pass to Tashigeng; Apr, anterior pedal retractor scar. a, lateral view; b, dorsal view (SNSB-BSPG 2020 XCIX 54 b). 13. Articulated specimen from the lower member at Langza (SNSB-BSPG 2020 XCIX 59 a). a, left valve view; b, dorsal view.