Depressizona is a genus of small to minute sea snails, marine gastropod molluscs or micromolluscs in the superfamily Scissurelloidea.
| Depressizona | |
|---|---|
| Scientific classification | |
| Kingdom: | |
| Phylum: | |
| Class: | |
| (unranked): | clade Vetigastropoda
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| Superfamily: | |
| Family: | Depressizonidae Geiger, 2003[1]
|
| Genus: | Depressizona Geiger, 2003[1]
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| 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
editGenus 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
editThe shape of the shell is calyptraeiform.
References
edit- ^ a b Geiger D. L. (2003). "Phylogenetic assessment of characters proposed for the generic classification of Recent Scissurellidae (Gastropoda: Vetigastropoda) with a description of one new genus and six new species from Easter Island and Australia". Molluscan Research 23(1): 21-83. doi:10.1071/MR02017, abstract. PDF.
- ^ a b c d Geiger D. L. (2009). "A new species of Depressizona and the family rank of Depressizonidae". Zootaxa 2059: 57-59. abstract, full article.
- ^ Bouchet, Philippe; Rocroi, Jean-Pierre; Frýda, Jiri; Hausdorf, Bernard; Ponder, Winston; Valdés, Ángel & Warén, Anders (2005). "Classification and nomenclator of gastropod families". Malacologia. 47 (1–2). Hackenheim, Germany: ConchBooks: 1–397. ISBN 3-925919-72-4. ISSN 0076-2997.
- ^ Depressizona. Retrieved through: World Register of Marine Species on 11 April 2010.
- ^ Depressizona axiosculpta Geiger, 2009. Retrieved through: World Register of Marine Species on 11 April 2010.
- ^ Depressizona exorum Geiger, 2003. Retrieved through: World Register of Marine Species on 11 April 2010.
- Geiger D.L. (2012) Monograph of the little slit shells. Volume 1. Introduction, Scissurellidae. pp. 1-728. Volume 2. Anatomidae, Larocheidae, Depressizonidae, Sutilizonidae, Temnocinclidae. pp. 729–1291. Santa Barbara Museum of Natural History Monographs Number 7.