Alvania interrupta

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
Domain: Eukaryota
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
  • † Alvania (Linemera) interrupta (H. J. Finlay, 1924) alternate representation
  • † Linemera interrupta Finlay, 1924
  • † Rissoa gradata F. W. Hutton, 1885 (invalid: not d'Orbigny, 1842)

Description

This species is characterized by its irregularly-placed spiral ribs, these being crowded anteriorly, but almost absent posteriorly, so that spire-whorls have only two distinct ribs close to suture below. There are, however, traces of faint flattish ribs with linear interstices between these and suture above, and a distinct groove crosses ribs just below suture. [2]

Distribution

Fossils of this marine species were found in Tertiary strata in New Zealand

References
  1. MolluscaBase eds. (2024). MolluscaBase. Alvania interrupta (H. J. Finlay, 1924) †. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=832775 on 2024-02-14
  2. Finlay H.J. (1924). New Zealand Tertiary rissoids. Transactions of the New Zealand Institute. 55: 480-494. This article incorporates text from this source, which is in the public domain.
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