Callogonia Dall, 1889a

Little, Crispin T. S., Kumar, Rajendar, Johnson, Joel E. & Hoffman, Leon, 2025, Bathyal molluscs from Upper Pleistocene methane seeps in Krishna-Godavari Basin, offshore eastern India, Acta Palaeontologica Polonica 70 (3), pp. 443-477 : 464-465

publication ID	https://doi.org/10.4202/app.01179.2024
persistent identifier	https://treatment.plazi.org/id/4019EF34-4E79-FF83-CC7F-F93B757E3530
treatment provided by	Felipe
scientific name	Callogonia Dall, 1889a
status

Treatment

Genus Callogonia Dall, 1889a View in CoL

Type species: Callocardia (Callogonia) leeana Dall, 1889a ; Recent, North-West Atlantic.

Callogonia cf. leeana ( Dall, 1889a) View in CoL Fig. 18B View Fig .

Material.—One shell, SMF 373082. Northern Indian Ocean, Krishna-Godavari Basin , Bay of Bengal, offshore eastern

India, 15°51.8647’ N, 81°50.0709’ E, 1050 m water depth, 15.73 mbsf level, core NGHP-01-10D; Upper Pleistocene GoogleMaps .

Description.—Medium-sized, fragile vesicomyid shell, equivalve, subequilateral. Outline ovate, strongly protruding umbo directed anteriorly, all margins convex, anterior and posterior weakly truncated obliquely. Sculpture with numerous irregular coarse growth lines. Lunule not conspicuous, narrow elongated escutcheon. Internally, small elongated teeth, thin hinge plate, pallial sinus. Length 38 mm

Remarks.—Outline, sculpture, hinge and pallial sinus are similar to Callogonia leeana ( Dall, 1889a) from the NW Atlantic; even though there is a morphological similarity, it may be a different species in view of the large oceanic distance to the type locality. The left valve of the present species shows a clear sinus in the pallial line, which is characteristic for the genus.

Genus Archivesica Dall, 1908b View in CoL

Type species: Callocardia gigas Dall, 1896 , by original designation; Recent, E Pacific.