Striatoconulus sp.
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. |
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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.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Genus |
Striatoconulus sp.
Ferrari, S. Mariel 2009 |
Striatoconulus latus Gründel, 2000
Grundel 2000 |
S. latus
Grundel 2000 |