Jurassic bivalves from the Spiti area of the Himalayas, northern India Author Fuersich, Franz T. https://orcid.org/0000-0002-0844-9297 Universitaet Erlangen-Nuernberg, GeoZentrum Nordbayern, FG Palaeoumwelt, Lowenichstrasse 28, 91054 Erlangen, Germany franz.fuersich@fau.de Author Alberti, Matthias State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Centre for Research and Education on Biological Evolution and Environment and Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing 210023, China Author Pandey, Dhirendra K. https://orcid.org/0000-0002-7721-9604 Department of Earth and Environmental Science, KSKV Kachchh University, Bhuj, India Author Ayoub-Hannaa, Wagih S. Geology Department, Faculty of Science, Minufiya University, El-Minufiya, Shibin El Kom, Egypt text Zitteliana 2022 2022-08-11 96 153 178 http://dx.doi.org/10.3897/zitteliana.96.87253 journal article http://dx.doi.org/10.3897/zitteliana.96.87253 2747-8106-96-153 191199E07F3E4E09A3774ADFBF93A248 AFA9059B36235BFF9BA3E9B7BE816DC1 Camptonectes (Camptochlamys) obscurus (J. Sowerby, 1818) Plate 3, fig. 13 Pecten obscura *1818 Pecten obscura - J. Sowerby: 3, pl. 205, fig. 1. Camptonectes indicus 1852 Camptonectes indicus sp. nov. - Cox: 25, pl. 3, figs 1-4. Camptonectes Germaniae ?1939 Camptonectes Germaniae ( d'Orb .) - Stefanini: 171, pl. 19, fig. 11. 1956 Camptonectes indicus Cox - Agrawal: 77, pl. 9, fig. 5. 1968 Camptonectes indicus Cox - Maithani: 505, pl. 33, fig. 6. 1979 Camptonectes (Indonectes) obscurus (J. Sowerby) subgen. nov. - Kanjilal: 120, fig. 6. 1983 Camptonectes (Indonectes) obscurus (J. Sowerby) - Singh and Jaitly: 47, pl. 1, fig. 5. 1995 Camptonectes (Camptochlamys) obscurus (J. Sowerby, 1818) - Jaitly et al.: 196, pl. 19, figs 7-8. Material. A single left valve partly in shell preservation, seen from the interior, from the lower member near the pass to Tashigeng (SNSB-BSPG 2020 XCIX 13). Description. Shell suboval, higher than long (H: 22.2 mm, L: ~20 mm), moderately inflated, anteroventral, posteroventral and ventral margins rounded and regularly curved; antero- and posterodorsal margins of disc sub-straight. Anterior auricle large, distinctly set off from anterodorsal flank, which is more steeply sloping than posterodorsal flank. Tip of umbo and posterior auricle missing, anterior and posterior margin of disc also not fully preserved. Disc ornamented with thin, sharp, regularly spaced commarginal ribs and numerous thin divaricate radial grooves, separated by smooth, flat intervals about twice the width of the grooves. Umbonal area with thin radial riblets. Anterior auricle covered with spaced commarginal riblets intersected by thin radial riblets, creating a reticulate pattern. Remarks. The specimen closely corresponds to the diagnosis of Camptonectes (Camptochlamys) obscurus as given by Johnson (1984) . So far, the species has not been recorded from the Himalayan shelf of the southern Tethys, but it occurs in the Callovian of the Kachchh Basin further south ( Cox 1952 ; Jaitly et al. 1995 ) and possibly also in other parts of the Ethiopian faunal province (e.g., as Camptonectes germaniae ( d'Orbigny , 1850) in Somalia; Stefanini 1939 p. 171, pl. 19, fig. 11).