Cirsonella densilirata

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Cirsonella densilirata
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Clade: Vetigastropoda
Superfamily: Trochoidea
Family: Skeneidae
Genus: Cirsonella
Species:C. densilirata
Binomial name
Cirsonella densilirata
Suter, 1908

Cirsonella densilirata is a minute sea snail, a marine gastropod mollusc in the family Skeneidae. [1]

Sea snail common name for snails that normally live in saltwater

Sea snail is a common name for snails that normally live in salt water, in other words marine gastropods. The taxonomic class Gastropoda also includes snails that live in other habitats, such as land snails and freshwater snails. Many species of sea snails are edible and exploited as food sources by humans.

Family is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy; it is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as being the "walnut family".

Skeneidae family of molluscs

The Skeneidae are a family of minute to small marine gastropod molluscs in the superfamily Trochoidea.

Contents

Description

(Original description by Henry Suter) The height of the shell attains 1.8 mm, its diameter 2.3 mm. The small, white shell has a turbinate shape. It is subdiaphanous, slightly shining, and perforated. Its sculpture consists of numerous fine microscopic spiral lirae. The spire is depressed conoidal. Its outlines are convex, lower than the aperture. The yellowish-white protoconch consists of 2 convex smooth whorls. The 3½ convex whorls are rapidly increasing. The periphery of the body whorl is rounded. The base of the shell is convex, with an impressed umbilical area. The suture is not much impressed. The circular aperture is oblique. Inside it is microscopically lirate. The peristome is continuous and thick. The arcuate columella is slightly expanded toward the narrow perforation, sometimes partly concealing it. The horny operculum is multispiral with a central nucleus. [2]

Sculpture (mollusc)

Sculpture is a feature of many of the shells of mollusks. It is three-dimensional ornamentation on the outer surface of the shell, as distinct from either the basic shape of the shell itself or the pattern of colouration, if any. Sculpture is a feature found in the shells of gastropods, bivalves, and scaphopods. The word "sculpture" is also applied to surface features of the aptychus of ammonites, and to the outer surface of some calcareous opercula of marine gastropods such as some species in the family Trochidae.

Spire (mollusc)

A spire is a part of the coiled shell of molluscs. The spire consists of all of the whorls except for the body whorl. Each spire whorl represents a rotation of 360°. A spire is part of the shell of a snail, a gastropod mollusc, a gastropod shell, and also the whorls of the shell in ammonites, which are fossil shelled cephalopods.

Aperture (mollusc) The main opening of the shell, where the head-foot part of the body of the animal emerges

The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc.

Distribution

This marine species is endemic to New Zealand and was found off South Island.

South Island Southernmost of the two main islands in New Zealand

The South Island, also officially named Te Waipounamu, is the larger of the two major islands of New Zealand in surface area; the other being the smaller but more populous North Island. It is bordered to the north by Cook Strait, to the west by the Tasman Sea, and to the south and east by the Pacific Ocean. The South Island covers 150,437 square kilometres (58,084 sq mi), making it the world's 12th-largest island. It has a temperate climate.

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References

  1. ↑ Rosenberg, G. (2013). Cirsonella densilirata Suter, 1908. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=598290 on 2013-10-03
  2. ↑ Suter H. (1913-1915), Manual of new Zealand Mollusca; Wellington, N. Z. :J. Mackay, govt. printer,1913-1915

Arthur William Baden Powell was a New Zealand malacologist, naturalist and palaeontologist, a major influence in the study and classification of New Zealand molluscs through much of the 20th century. He was known to his friends and family by his third name, "Baden".

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