| Besla | |
|---|---|
 | |
| Apertural view of the shell of Besla convexa | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subcohort: | Panpulmonata |
| Superfamily: | Pyramidelloidea |
| Family: | Pyramidellidae |
| Genus: | Besla Dall & Bartsch, 1904 |
| Type species | |
| Odostomia convexa Carpenter, 1857 | |
Besla is a small genus of miniature sea snails, pyramidellid gastropod mollusks in the family Pyramidellidae within the tribe Chrysallidini (sensu taxonomy by Bouchet & Roctroi, 2005). [1]
The synonymy of Parthenina (Bucquoy, Dautzenberg & Dolfus, 1883) with Besla (Doll & Bartsch, 1904) proposed by Micali et al., (2012) is debatable. The type species of Besla has a protoconch axis at 90° with that of teleoconch (Type Aprotoconch), whereas that of Parthenina is tilted at nearly 180° (Type C); therefore, these divergent characteristics suggest that Besla and Parthenina are unrelated and that their teleoconch sculpture may be convergent . [2]
Very little is known about the biology of the members of this genus. As is true of most members of the Pyramidellidae sensu lato , they are most likely to be ectoparasites.
There are more than twenty known species within the genus Besla, these include:
Pyramidellidae, common name the pyram family, or pyramid shells, is a voluminous taxonomic family of mostly small and minute ectoparasitic sea snails, marine heterobranch gastropod molluscs. The great majority of species of pyrams are micromolluscs.
Odostomiinae, Odostomia snails and their allies, is a taxonomic subfamily of minute parasitic sea snails. These are marine heterobranch gastropod mollusks, or micromollusks, in the family Pyramidellidae.
Turbonillinae is a subfamily of mostly minute parasitic sea snails, marine gastropod molluscs in the family Pyramidellidae, the pyrams and their allies.
Chrysallidinae is a taxonomic group of very small sea snails, marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.
Tiberia is a genus of minute parasitic sea snails, marine gastropod molluscs in the family Pyramidellidae, the pyrams and their allies. Tiberia is the only genus in the tribe Tiberiini.
Oscilla is a genus of very small sea snails, minute marine gastropod mollusks or micromollusks. This genus is currently placed in the subfamily Chrysallidinae of the family Pyramidellidae.
Trabecula is a genus of very small sea snails, marine gastropod molluscs or micromolluscs in the family Pyramidellidae, the pyrams and their allies, and the subfamily Chrysallidinae, a large taxon of minute marine gastropods with an intorted protoconch.
Chrysallida is a speciose genus of minute sea snails, pyramidellid gastropod mollusks or micromollusks in the family Pyramidellidae within the tribe Chrysallidini.
Babella is a genus of very small sea snails, pyramidellid gastropod mollusks or micromollusks in the family Pyramidellidae within the tribe Chrysallidini.
Egila is a genus of small sea snails, marine gastropod mollusks in the family Pyramidellidae, the pyrams and their allies.
Folinella is a genus of minute sea snails, pyramidellid gastropod mollusks or micromollusks in the family Pyramidellidae within the tribe Chrysallidini.
Parthenina is a genus of very small sea snails, pyramidellid gastropod mollusks or micromollusks.
Parthenina juliae is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.
Syrnola is a genus of sea snails, marine gastropod mollusks in the family Pyramidellidae, the pyrams and their allies.
Turbonilla is a large genus of ectoparasitic sea snails, marine gastropod molluscs in the family Pyramidellidae, the pyrams and their allies.
Pyrgulina is a small genus of very small sea snails, pyramidellid gastropod mollusks or micromollusks. This genus is currently placed in the subfamily Chrysallidinae of the family Odostomiidae.
Parthenina clathrata is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.
Besla cossmanni is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies. The species is one of twelve known species within the Besla genus of gastropods.
Nisiturris is a genus of sea snails, marine gastropod mollusks in the family Pyramidellidae, the pyrams and their allies.