Entolium (Entolium) corneolum (Young & Bird, 1828)

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

Entolium (Entolium) corneolum (Young & Bird, 1828)

Plate 3, fig. 11

Pecten corneolus *1828 Pecten corneolus - Young and Bird: 234, pl. 9, fig. 5.

Pecten 1924 Pecten (Entolium) demissum Phillips - Hennig: 14, pl. 2, figs 1-2.

1933 Pecten (Entolium) solidus Roemer - Dietrich: 65, pl. 8, figs 118, 119.

1938 Entolium demissum (Phillips) - Weir: 46, pl. 3, fig. 8.

1939 Entolium demissum (Phillips) - Stefanini: 179, pl. 22, figs 2-3.

1965 Entolium corneolum (Young & Bird) - Cox: 1965: 51.

1981 Entolium (Entolium) corneolum (Young & Bird) - Kanjilal: 265, pl. 1, fig. 1.

1995 Entolium (Entolium) corneolum (Young & Bird, 1828) - Jaitly et al.: 193: pl. 18, figs 8-9.

Material.

Internal mould of a left valve from the lower member at Langza (SNSB-BSPG 2020 XCIX 15).

Description.

Disc subovate, smooth, poorly inflated. Length 21.7 mm, height>25 mm. Auricles well demarcated from disc, only partly preserved, anterior auricle apparently larger than posterior one. Anterior, posterior, and ventral margin forming a semi-circle.

Remarks.

The specimen can be referred to Entolium (E.) corneolum without doubt, based on its outline, even though no shell is preserved. Left valves of E. corneolum , E. lunare (Roemer, 1839), and E. orbiculare (J. Sowerby, 1817) are very similar, but differ with respect to stratigraphic and/or geographic distribution ( Johnson 1984).

Figures

Plate 3. (1, 2) Bositra buchii (Roemer, 1836). Composite moulds from the lower member at Langza. 1. a, articulated specimen in butterfly position, dorsal view (SNSB-BSPG 2020 XCIX 18 a); b, c, single valves, lateral view (SNSB-BSPG 2020 XCIX 18 b). 2. External mould of right valve (SNSB-BSPG 2020 XCIX 19). (3) Australobuchia spitiensis (Holdhaus, 1913). Composite mould of articulated specimen from the middle member, roadside close to Komic; right valve view (SNSB-BSPG 2020 XCIX 43). (4 - 5) Australobuchia blanfordiana (Stoliczka, 1866). upper member close to Demul Pass. 4. Right valve (SNSB-BSPG 2020 XCIX 46). 5. Right valve (SNSB-BSPG 2020 XCIX 45). (6 - 10)? Malayomaorica sp. upper member close to Demul Pass. 6. Left valve (SNSB-BSPG 2020 XCIX 51 a). 7. Right valve interior (SNSB-BSPG 2020 XCIX 52). 8. Fragment of right valve (SNSB-BSPG 2020 XCIX 51 b). 9. Left valve (SNSB-BSPG 2020 XCIX 51 c). 10. Fragment of right valve (SNSB-BSPG 2020 XCIX 51 d). (11) Entolium (Entolium) corneolum (Young & Bird, 1822). Internal mould of a left valve from the lower member at Langza (SNSB-BSPG 2020 XCIX 15). (12) Propeamussium (Propeamussium) sp. Internal mould of a small fragment from the lower member at Langza (SNSB-BSPG 2020 XCIX 12). a, natural size; b, enlarged. (13) Camptonectes (Camptochlamys) obscurus (J. Sowerby, 1818). Left valve interior from the lower member near the pass to Tashigeng (SNSB-BSPG 2020 XCIX 13).