Gryphaeidae indet., 1814

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

Gryphaeidae indet.

Plate 2, figs 5, 6

Material.

Four single valves, partly preserved as internal moulds, from the upper member close to the Demul Pass (SNSB-BSPG 2020 XCIX 37-38).

Description and remarks.

The comparatively small (H: 11-19 mm), poorly preserved specimens are nearly flat and covered with irregular growth rugae. The available features preclude a precise identification. Possibly, they belong to the common Jurassic genus Liostrea Douvillé, 1904.

Figures

Plate 2. (1, 2) Retroceramus (Retroceramus) haasti (Hochstetter, 1863). 1. Fragment of internal mould of single valve with remains of shell from the upper member, road cut close to Demul Pass (SNSB-BSPG 2020 XCIX 62 a). 2. Fragment of external mould of single valve with remains of shell from the upper member, road cut close to Demul Pass (SNSB-BSPG 2020 XCIX 62 b). (3, 4) Retroceramus (Retroceramus) everesti (Oppel, 1863). Fragmented internal moulds from the upper member near Demul. 3. Right valve (SNSB-BSPG 2020 XCIX 65). 4. Right valve (SNSB-BSPG 2020 XCIX 64). (5, 6) Gryphaeidae indet. from the upper member close to the Demul Pass 5. Right valve (SNSB-BSPG 2020 XCIX 37). 6. Right valve (SNSB-BSPG 2020 XCIX 38).