Depressizona

Depressizona
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
(unranked):	clade Vetigastropoda
Superfamily:	Scissurelloidea
Family:	Depressizonidae Geiger, 2003[1]
Genus:	Depressizona Geiger, 2003[1]
Diversity
2 species[2]

Depressizona is a genus of small to minute sea snails, marine gastropod molluscs or micromolluscs in the superfamily Scissurelloidea.

Depressizona is the type genus of the family Depressizonidae. Depressizona is the only genus within the family Depressizonidae.^[2]

Taxon 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 have been also 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 exorum Geiger, 2003^[5] - from Easter Island. Type species of the genus Depressizona.
• Depressizona axiosculpta Geiger, 2009^[2][6] There is only one specimen in poor condition known from Tonga.

Description

The shape of the shell is calyptraeiform.

References

1. ^ ^{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.
2. ^ ^{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.
3. ^ Bouchet P., Rocroi J.-P., Frýda J., Hausdorf B., Ponder W., Valdés Á. & Warén A. (2005). "Classification and nomenclator of gastropod families". Malacologia: International Journal of Malacology (Hackenheim, Germany: ConchBooks) 47 (1-2): 1–397. ISBN 3925919724. ISSN 0076-2997. http://www.archive.org/details/malacologia47122005inst. 
4. ^ Depressizona .  Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=391108 on 11 April 2010.
5. ^ Depressizona exorum Geiger, 2003.  Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=395893 on 11 April 2010.
6. ^ Depressizona axiosculpta Geiger, 2009.  Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=457440 on 11 April 2010.

External links