Dillwynella aulacophora
| Dillwynella aulacophora | |
|---|---|
 | |
| Original images of a shell of Dillwynella aulacophora | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Clade: | Vetigastropoda |
| Superfamily: | Trochoidea (superfamily) |
| Family: | Skeneidae |
| Genus: | Dillwynella |
| Species: | D. aulacophora |
| Binomial name | |
| Dillwynella aulacophora M. Cossmann, 1913 | |
Dillwynella aulacophora is an extinct species of sea snail, a marine gastropod mollusk in the family Skeneidae.[1]
Description
The height of the shell attains 4 mm, its diameter 5 mm. The rather small shell had a trochoid shape. The surface appears smooth and shiny. The depressed spire consists of four or five subangular whorls, equipped with a broad groove between the spiral obsolete angle and slightly protruding bead that comes in above the linear and deep suture. In the middle of this groove, there is a small furrow that marks its deepest point. Above the angle , the profile of the whorls is a slightly convex. The body whorl is equal to five-sixths of the total height simply striated. It is marked by oblique growth lines. The periphery is obtusely subangular, non keeled , but rather rounded. The base of the shell is slightly convex and smooth. The aperture is round. The peristome is discontinuous and thin, except in the columellar region that contains a callosity.[1]
Distribution
This marine species was found as a fossil in a coal mine near Mons in Belgium.