Depressizona
Genus of gastropods
From Wikipedia, the free encyclopedia
Depressizona is a genus of small to minute sea snails, marine gastropod molluscs or micromolluscs in the superfamily Scissurelloidea.
| Depressizona | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Vetigastropoda |
| Order: | Lepetellida |
| Superfamily: | Scissurelloidea |
| Family: | Depressizonidae Geiger, 2003[1] |
| Genus: | Depressizona Geiger, 2003[1] |
| Type species | |
| Depressizona exorum Geiger, 2003 (type by original designation) | |
| Diversity[2] | |
| 2 species | |
Depressizona is the only genus within the family Depressizonidae.[2]
Depressizonidae was described as the subfamily Depressizoninae Geiger, 2003, in 2003. Then in 2005 it was considered to be a synonym of Scissurellinae in the family Scissurellidae according to the taxonomy of Bouchet & Roctoi (2005)[3] and it has also been placed in Scissurellidae.[4] In 2009 it was updated to the family level, Depressizonidae, when the second known species Depressizona axiosculpta was described.[2]
Species
Genus Depressizona contains two species only:
- Depressizona axiosculpta Geiger, 2009[2][5] It was described from only one specimen in poor condition known from Tonga. Geiger (2012) illustrated a second specimen in much better condition.
- Depressizona exorum Geiger, 2003[6] - from Easter Island. Type species of the genus Depressizona.
Description
The shape of the shell is calyptraeiform.