Volvarina eurychilus

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Volvarina eurychilus
Volvarina eurychilus 001.jpg
Drawing of a shell of Volvarina eurychilus (holotype)
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Neogastropoda
Family: Marginellidae
Subfamily: Marginellinae
Genus: Volvarina
Species:
†V. eurychilus
Binomial name
†Volvarina eurychilus
(Cossmann, 1892)
Synonyms

† Marginella eurychilusCossmann, 1892 superseded combination

Contents

Volvarina eurychilus is an extinct species of sea snail, a marine gastropod mollusk in the family Marginellidae, the margin snails. [1]

Description

The length of the shell attains 7.5 mm, its diameter 3.5 mm.

(Original description in French) The narrow and elongated shell is slightly compressed. It is oliviform, with a very short whorl, terminating in an obtuse apex. The shell consists of four subulate whorls, barely convex, separated by an inconspicuous suture. The body whorl is very large, depressed and subangular posteriorly, where a narrow ramp surmounts the suture and attenuated anteriorly, where it terminates in a fairly wide truncation of the siphonal canal, which is not indented. The aperture is elongated, with almost parallel lips, occupying more than two-thirds and almost three-quarters of the total height. The outer lip is bordered by a very wide and flat bead, which goes up to the suture of the penultimate whorl and which circumvents the anterior truncation of the siphonal canal. The outer lip is vertical, sinuous, slightly indented on the posterior side. The columellar margin is thin and widely spreading, provided with five slightly thick and decreasing plaits: the first in front is flattened and forms the continuation of the rim of the lip, the fifth behind is thin and more sunken than the others. [2]

Distribution

Fossils of this marine species were found in Eocene strata in Paris Basin, France.

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References

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