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 Nicaniella (Nicaniella) cf. polymorpha (Contejean, 1860) Plate 5, fig. 7a-d cf. 1860 Astarte polymorpha Contej. - Contejean: 266, pl. 11, figs 13-16. Material. A single articulated specimen from the lower member, Kaza-Hikkim road (SNSB-BSPG 2020 XCIX 42). Plate 5. (1-6) Pruvostiella (Pruvostiella) hermanni (Oppel, 1863). 1. Crushed articulated specimen from the lower member at Langza (SNSB-BSPG 2020 XCIX 53). a, left valve view; b, dorsal view. 2. Crushed articulated specimen from the lower member close to the pass to Tashigeng (SNSB-BSPG 2020 XCIX 54a). a, left valve view; b, right valve view. 3. Crushed articulated specimen from the lower member at the Kaza-Hikkim road cut (SNSB-BSPG 2020 XCIX 55a). 4. Articulated specimen from the lower member at Langza (SNSB-BSPG 2020 XCIX 59b). a, right valve view; b, left valve view. 5. Articulated specimen from the lower member close to the pass to Tashigeng (SNSB-BSPG 2020 XCIX 54b). a, right valve view; b, dorsal view; c, left valve view. 6. Crushed articulated specimen from the lower member at the Kaza-Hikkim road cut (SNSB-BSPG 2020 XCIX 55b). (7) Nicaniella (Nicaniella) cf. polymorpha (Contejean, 1860). Articulated specimen from the lower member at the Kaza-Hikkim road cut (SNSB-BSPG 2020 XCIX 42). a, right valve view, natural size; b, enlarged; c, dorsal view; d, left valve view. (8) Cryptocardia sp. Right internal mould with remains of shell from the lower member close to the pass to Tashigeng (SNSB-BSPG 2020 XCIX 40). (9) Integricardium (Integricardium) bannesianum (Contejean, 1860). Right internal mould with remains of shell from the Ferruginous Oolite Formation near Zangla (SNSB-BSPG 2020 XCIX 41). a, lateral view; b, dorsal view. Description. Specimen small-sized (H: 9.1 mm; L: 9.7 mm), rounded-triangular, slightly longer than high, moderately inflated. Anterodorsal margin concave, anteroventral margin convex, ventral margin faintly curved, posterodorsal margin long, straight, sloping, forming a rounded angle with the slightly truncated posteroventral margin. Umbones mesial, conspicuous, prosogyrate. Lunule oval, deeply sunk, bordered by sharp carina. Escutcheon long, lanceolate, sharply demarcated, extending to posterior end. Ventral shell margin strongly crenulated. Shell surface covered with 22 closely set, sharp commarginal ribs which are more widely spaced in the umbonal area. Internal features not seen. Remarks. Among the numerous Jurassic species of Nicaniella , the specimen is closest to Nicaniella polymorpha (Contejean,1860: 266, pl. 11, figs 13-16) from the Kimmeridgian of eastern France in outline and ornamentation, but that species is known only from its drawings. Therefore, we place our specimen in this species with reservation. Order Cardiida Ferrusac, 1822