Borsonia smithi

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Borsonia smithi
Borsonia smithi 001.jpg
Original images of a shell of Borsonia smithi
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Clade: Caenogastropoda
Clade: Hypsogastropoda
Clade: Neogastropoda
Superfamily: Conoidea
Family: Borsoniidae
Genus: Borsonia
Species:B. smithi
Binomial name
Borsonia smithi
Schepman, 1913

Borsonia smithi is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae. [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".

Borsoniidae family of molluscs

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

Contents

Description

The height of the shell attains 18 mm.

(Original description) The rather thick shell has a fusiform shape and is yellowish-white. The upper whorls are lost by erosion. Of the remaining 6 whorls the upper ones are still eroded, of the 4 whorls which are in sufficient state of preservation, the upper 2 are slightly angular, their upper part a little excavated, the lower part more convex, with a single row of nodules on the limit. In the lower ones the shell is slightly excavated below the suture, but otherwise regularly rounded, without nodules. The sculpture consists of numerous arcuate striae, with stronger ones at intervals, indicating the margin of the sinus at former periods, and very faint traces of spiral striae in the excavation of the upper whorls, lower part of each whorl is sculptured with very fine growth-striae, likewise stronger at intervals and rather weak spiral lirae, of which there are 2 below the angle of the upper sculptured whorl, 2 or 3 on the next, 5 on penultimate and numerous ones on the body whorl. This latter is regularly attenuated towards the base and runs in the rather long, large canal, which in its basal part is free from lirae and only sculptured by fine and groovelike growth-lines. The aperture is angularly ovate, with a moderately sharp angle above, ending below in a rather wide, slightly contorted siphonal canal. The peristome is a little broken, probably rather thick, with a wide, rather shallow sinus above, then regularly arched. The columellar margin is concave at the upper part, along the body whorl, then thickened, with an obtuse, oblique fold at the upper part of this thicker one, directed to the left below, along the siphonal canal. The interior of the aperture is smooth, white, the whole columellar side with a strong layer of enamel. [2]

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.

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.

Body whorl

The body whorl is part of the morphology of the shell in those gastropod mollusks that possess a coiled shell. The term is also sometimes used in a similar way to describe the shell of a cephalopod mollusk.

Distribution

This marine species occurs off Indonesia.

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References

  1. ↑ WoRMS (2015). Borsonia smithi Schepman, 1913. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=433158 on 2016-03-02
  2. ↑ Schepman, 1913. The prosobranchia of the Siboga expedition. Part IV -V - VI: Toxoglossa; p. 420


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