Chlamys (Chlamys) cf. textoria (Schlotheim, 1820)

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

Chlamys (Chlamys) cf. textoria (Schlotheim, 1820)

Plate 4, fig. 2

cf. 1820 Pectinites textorius - Schlotheim, p. 229.

cf. 1952 Chlamys (Chlamys) ambigua ( Münster) - Cox: 4, pl. 1, figs 2-4.

cf. 1965 Chlamys subtextoria ( Münster) - Cox: 55, pl. 7, fig. 8.

cf. 1984 Chlamys (Chlamys) textoria ( Schlotheim 1820) - Johnson: 163, pl. 6, figs 10-12, pl. 7, figs 1-21, pl. 8, figs 1-3, 5-20,?4, text-figs 146-157.

cf. 1995 Chlamys (Chlamys) textoria ( Schlotheim 1820) - Jaitly et al.: 197, pl. 20, figs 3-7.

Material.

A single, incomplete right valve from the lower member at Langza (SNSB-BSPG 2020 XCIX 11).

Description.

Somewhat abraded right valve with ventral part missing. Early disc suborbicular, equilateral, poorly inflated. Auricles well-demarcated from disc. Posterior auricle relatively small, forming obtuse angle with disc. Disc with ~19 radial plicae plus some very faint ones near anterior and posterior end. Number of plicae increasing ventrally by bifurcating. No growth lines or commarginal lamellae seen due to poor preservation.

Remarks.

The poorly preserved specimen can be placed in Chlamys (C.) textoria with reservation only.

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.