Striatoconulus sp.

Ferrari, S. Mariel, 2009, Cosmopolitan Early Jurassic marine gastropods from west-central Patagonia, Argentina, Acta Palaeontologica Polonica 54 (3), pp. 449-461 : 451

publication ID

https://doi.org/ 10.4202/app.2008.0070

persistent identifier

https://treatment.plazi.org/id/03B7967C-5C57-AA24-650A-FA9B867710BF

treatment provided by

Felipe

scientific name

Striatoconulus sp.
status

 

Striatoconulus sp.

Fig. 2C View Fig .

Material.—MPEF−PI 1867a and b (part and counterpart); poorly preserved teleoconch.

Description.—Medium−sized, oval and low−spired shell. Protoconch unknown. Dextral teleoconch with four convex whorls; last whorl is incomplete. The spire represents about 1/3 of teleoconch height and is characterized by the presence of a high expansion rate. Sutures are incised.

On first whorls of the teleoconch ornament is poorly developed. In the later whorls of the teleoconch ornament consists of regularly spaced spiral furrows. No axial ornament is present. Apertural and umbilical features are not preserved.

Dimensions.—MPEF−PI 1867b: maximum height 25.6 mm; spire height 12.7 mm.

Remarks.—The convex teleoconch whorls, low spired shape, incised sutures, and the spiral ornament suggest an assignment to Striatoconulus (compare Gründel 2000; Kaim 2004).

Striatoconulus sp. is the first ataphrid recorded in the Early Jurassic of South America. The type species, Striatoconulus latus Gründel, 2000 is very similar to the Argentinean species. S. latus has a base weakly convex, with rounded edge to the flanks of the whorls, aperture broadly oval, inner lip with a broad callus and a halfmoon−shaped cavity on the columella ( Gründel 2000: 228, pl. 6: 11–15; Kaim 2004: 29, fig. 15). Basal, apertural and umbilical features are regrettably not preserved in Striatoconulus sp. and that is why the species is left in open nomenclature.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Trochida

Family

Ataphridae

Genus

Striatoconulus

Loc

Striatoconulus sp.

Ferrari, S. Mariel 2009
2009
Loc

Striatoconulus latus Gründel, 2000

Grundel 2000
2000
Loc

S. latus

Grundel 2000
2000
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