Anticlinura biconica

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Anticlinura biconica
Anticlinura biconica 001.jpg
Original image of a shell of Anticlinura biconica
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Clade: Caenogastropoda
Clade: Hypsogastropoda
Clade: Neogastropoda
Superfamily: Conoidea
Family: Mangeliidae
Genus: Anticlinura
Species:
A. biconica
Binomial name
Anticlinura biconica
(Schepman, 1913)
Synonyms [1]

Surcula biconicaSchepman, 1913 (original combination)

Contents

Anticlinura biconica is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae. [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 hierarcical 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".

Mangeliidae is a monophyletic family of small to medium-sized, predatory sea snails, marine gastropod mollusks in the superfamily Conoidea.

Description

The length of the shell attains 8¾ mm, its diameter 4½ mm.

(Original description) The rather thin, white shell has a biconical shape with a short siphonal canal. It contains 8 whorls, of which about 2 form a convexly whorled protoconch, which seems to be at first smooth, the second whorl being obliquely costulate. The whorls of the teleoconch are separated by a conspicuous, distinctly waved suture, angular, excavated above. Their sculpture shows rather narrow axial ribs, 14 in number on the body whorl, scarcely indicated in excavation. The whorls are divided by a strong keel, consisting of depressed tubercles, forming the upper part of ribs, at the base of the excavation. Moreover, there are 3 remote spirals on the scarcely contracted body whorl, which, in crossing the ribs, make them beaded, and 2 or 3 very faint, plain ones on the siphonal canal. In the upper whorls the uppermost of these lirae is nearly covered by the suture and causes the conspicuous waves. Otherwise the shell is nearly smooth, but for very fine growth lines, more conspicuous in the excavation. The aperture is oblong, angular above, with a short open siphonal canal below. The peristome is thin, broken, according to growth lines with a shallow sinus above, then slightly protracted. Thecolumellar margin is nearly straight, with a thin layer of enamel. [2]

Siphonal canal anatomical structure of certain sea snails

The siphonal canal is an anatomical feature of the shells of certain groups of sea snails within the clade Neogastropoda. Some sea marine gastropods have a soft tubular anterior extension of the mantle called a siphon through which water is drawn into the mantle cavity and over the gill and which serves as a chemoreceptor to locate food. In certain groups of carnivorous snails, where the siphon is particularly long, the structure of the shell has been modified in order to house and protect the soft structure of the siphon. Thus the siphonal canal is a semi-tubular extension of the aperture of the shell through which the siphon is extended when the animal is active.

Whorl (mollusc)

A whorl is a single, complete 360° revolution or turn in the spiral growth of a mollusc shell. A spiral configuration of the shell is found in of numerous gastropods, but it is also found in shelled cephalopods including Nautilus, Spirula and the large extinct subclass of cephalopods known as the ammonites.

Protoconch

A protoconch is an embryonic or larval shell which occurs in some classes of molluscs, e.g., the initial chamber of an ammonite or the larval shell of a gastropod. In older texts it is also called "nucleus". The protoconch may sometimes consist of several whorls, but when this is the case, the whorls show no growth lines.

Distribution

This species occurs in the Banda Sea, Indonesia

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References

  1. 1 2 WoRMS (2015). Anticlinura biconica (Schepman, 1913). In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=432974 on 2017-03-01
  2. ↑ Schepman, 1913. The prosobranchia of the Siboga expedition. Part IV -V - VI: Toxoglossa
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