| Alvania obeliscus | |
|---|---|
 | |
| Shell of Alvania obeliscus (holotype) | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Superfamily: | Rissooidea |
| Family: | Rissoidae |
| Genus: | Alvania |
| Species: | †A. obeliscus |
| Binomial name | |
| †Alvania obeliscus Harmer, 1920 | |
Alvania obeliscus is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae. [1]
The length of the shell is 4 mm (0.16 in), and its diameter is 0.3 mm (0.012 in).
(Original description) The small shell is conical. It contains about 7 whorls, nearly flat. The shell is ornamented by strong longitudinal ribs, 15 or 16 on the body whorl, and by well-marked spiral ridges, especially conspicuous near the base. The suture is distinct but not deep. The spire is somewhat elongate, regularly diminishing upwards. The aperture is ovate, compressed and angulated above and rounded below. The outer lip is thin. [2]
Fossils of this species were found in late Pliocene strata at St. Erth, Cornwall, Great Britain.
Curtitoma trevelliana is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.
Oenopota pyramidalis, common name the pyramid lora, is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.
Propebela harpularia is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.
Propebela scalaris is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.
Pyrgospira aenone is a species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae.
Colus gracilis is a species of sea snail, a marine gastropod mollusk in the family Buccinidae, the true whelks and the like.
Colus holboelli is a species of sea snail, a marine gastropod mollusk in the family Colidae, the true whelks and the like.
Alvania fischeri is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.
Alvania punctura is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.
Alvania beanii is a species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.
Otopleura auriscati, common name the cat's ear pyram, is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.
Bela odhneri is an extinct species of sea snail, a marine gastropod mollusk in the family Mangeliidae.
Alvania argentea is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.
Alvania belli is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.
Alvania cossmanni is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.
Alvania densecostata is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.
Alvania dubiosa is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.
Alvania erecta is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.
Alvania partimcancellata is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.
Alvania textiliformis is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.
This article incorporates text from this source, which is in the public domain . | This article needs additional or more specific categories .(February 2024) |