Alvania interrupta

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);

Alvania interrupta is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.^[1]

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

References

^ WoRMS. "Alvania interrupta (H. J. Finlay, 1924) †". World Register of Marine Species. Retrieved 2024-02-14.
^ Finlay, H.J. (1924). "New Zealand Tertiary Rissoids". Transactions and Proceedings of the Royal Society of New Zealand. 55: 480–494. This article incorporates text from this source, which is in the public domain. This article incorporates text from this source, which is in the public domain.

External links

Hutton, F. W. (1885). Descriptions of new Tertiary shells. Part 1. Transactions of the New Zealand Institute 17: 313-324.

[WoRMS-1] WoRMS. "Alvania interrupta (H. J. Finlay, 1924) †". World Register of Marine Species. Retrieved 2024-02-14.

[2] Finlay, H.J. (1924). "New Zealand Tertiary Rissoids". Transactions and Proceedings of the Royal Society of New Zealand. 55: 480–494. This article incorporates text from this source, which is in the public domain. This article incorporates text from this source, which is in the public domain.

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