Cerithioidea Fleming, 1822

Szabó, János & Jaitly, Anand Kumar, 2019, Additional Middle Jurassic gastropods from Kachchh (western India) in the collections of the Banaras Hindu University (Varanasi, India), Fragmenta Palaeontologica Hungarica 36, pp. 3-30 : 21-22

Superfamily? Cerithioidea Fleming, 1822

Cerithioidea ? sp.

( Figs 60 G, 66 )

Material – Single specimen, a poorly preserved natural cast of sediment on weathered rock surface.

Measurements – Inv. No.: BHU 2020I 304; H dam. = 11 mm, D = 2.4 mm.

Description – A turriculate shell is available without the apical shell parts. The earliest preserved whorls are apparently concave but the latest two whorls have convex surface. On the last whorl, an abaxially extended peristome is visible that has also a short, straight siphonal protrusion in axial position with a leftward oriented siphonal notch.

Remarks – The preservation of this specimen allows only to give an indication about a species that is probably a caenogastropod. Inflation of the last whorl and extension of the last peristome with true siphonal outlet occur since the Triassic in different caenogastropod families.

Occurrence – Khadir Island, Ghadada Formation, Lower Callovian.

Figures

Figs 60–66. Caenogastropods 2. – Fig. 60. A piece of naturally prepared bed plane with a fossil assemblage, containing also new species for the Kachchh Callovian fauna; letters indicate position of the gastropod specimens. – Figs 61–63. Exelissa aff. strangulata (d’Archiac, 1840). – 61. Apertural view, ×4.4. – 62. Abapertural view, ×5. – 63. Apertural view, ×3.5. – Figs 64–65. Exelissa? sp, ×8.8. – 64. The original view on another broken rock surface. – 65. A variety of Fig. 64, to make it more digestible through reflection, and inversion of colour. – Fig. 66. Cerithioidea? sp., a poorly preserved specimen, indicating a siphonostomatous species,also new for the Callovian fauna of Kachchh, ×3.4