Alvania interrupta
Species of gastropod
From Wikipedia, the free encyclopedia
Alvania interrupta is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.[1]
| Alvania interrupta | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Superfamily: | Rissooidea |
| Family: | Rissoidae |
| Genus: | Alvania |
| Species: | †A. interrupta |
| Binomial name | |
| †Alvania interrupta (H. J. Finlay, 1924) | |
| Synonyms | |
| |
Description
This species is characterized by its irregularly placed spiral ribs—these are crowded anteriorly but almost absent posteriorly, so that the spire whorls have only two distinct ribs close to the suture below. There are, however, traces of faint, flattish ribs with linear interstices between these and the suture above, and a distinct groove crosses the ribs just below the suture.[2]
Distribution
Fossils of this marine species were found in Tertiary strata in New Zealand
