Dikoleps, Hoisaeter, 1968

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 : 452-453

publication ID

https://doi.org/10.4202/app.01179.2024

persistent identifier

https://treatment.plazi.org/id/4019EF34-4E65-FF9F-CC7F-F98477C93003

treatment provided by

Felipe

scientific name

Dikoleps
status

sp. nov.

Dikoleps View in CoL ? magnarota Hoffman & Little sp. nov.

Fig. 9 View Fig .

Zoobank LCID: urn:lsid:zoobank.org:act:2B99F77B-E09E-4802-8D26-DDE333A81C5F .

Etymology: From the resemblance of the species to a big wheel, magna rota in Latin.

Type material: Holotype, SMF376542 About SMF , well preserved shell with protoconch . Paratypes, two shells, SMF 376541 About SMF ; one shell, SMF376543 About SMF ; one shell, SMF376544 About SMF , from the type locality and horizon.

Type locality: Northern Indian Ocean, Krishna-Godavari Basin , Bay of Bengal, offshore eastern India, 15°51.6335’ N, 81°50.2274’ E, 1046 m water depth GoogleMaps .

Type horizon: 16.18–16.48 mbsf level, core NGHP-01-12A; Upper Pleistocene .

Material.— Type material and several specimens from core NGHP-01-12A (for details see Table 1).

Diagnosis.—Very small shell with flattened spire, fragile, sculpture with broadly undulating ribs on shoulder, suture narrow and deep.

Dimensions.— Holotype height 0.8 mm, length 1.3 mm. Maximum dimensions of shells in type set as in holotype.

Description.—Protoconch single stage only, three quarters flattened smooth whorl, curved broken lip. Transition to protoconch clear by change in sculpture. Length 220 μm Teleoconch slightly raised, two and a half rounded whorls. Sculpture smooth with fine growth lines and flexuous undulations on shoulder, undulations disappearing near periphery; base smooth with fine flexuous growth lines. Umbilicus open, deep. Aperture well rounded convex, flexuous, sharp external and columellar lip; parietal side concave; callus very thin.

Remarks.—We are somewhat uncertain about the generic assignment of the species, but place it in the genus Dikoleps ( Skeneidae ) on the basis of the morphology of the protoconch, teleoconch and the flexuous base of the lip and the growth lines. Currently, nine Dikoleps species are known; eight species in the NE Atlantic and Mediterranean Sea, mostly living subtidally down to an upper bathyal depth range, and one species is known from South Africa (MolluscaBase 2024). This is the first species from the northern Indian Ocean.

Stratigraphic and geographic range.— Type locality and horizon only.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Trochida

Family

Skeneidae

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