Borsonia saccoi

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Borsonia saccoi
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. saccoi
Binomial name
Borsonia saccoi
Dall, 1908
Synonyms [1]

Borsonia (Borsonella) saccoi Dall, 1908 (original combination)

Contents

Borsonia saccoi 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 slow moving marine gastropod molluscs usually with visible external shells, such as whelks or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the absence of a visible shell.

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".

Borsoniidae family of molluscs

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

Description

The size of the shell attains 14 mm.

(Original description) The solid shell is much eroded. It is short, chalky, with an olive-gray periostracum and over five whorls. The short spire is conic. The nuclear whorls are lost. The anal fasciole is depressed, forming a constricted concave band near the posterior edge of the whorl which is thickened and marginate. On the anterior side of the fasciole the shoulder of the whorl forms the periphery on which arc (thirteen on the body whorl) short, rounded, wavelike nodules or axial ribs which are slightly protective and do not extend over the base. The other axial sculpture is composed of rather marked elevated, more or less irregular lines of growth. On the fasciole and base these are more or less obscured by spiral impressed lines with much wider interspaces, which appear feeble and as if obsolete where not eroded. The siphonal canal is short and straight. The outer lip is simple with the sulcus near the suture, rather wide and deep when complete. The body has a white callus and near the insertion of the columella a single very strong sharp edged spiral plication extending into the spire. The plication on the columella extends fully to the columellar callus, and is quite conspicuous. [2]

Periostracum

The periostracum is a thin organic coating or "skin" which is the outermost layer of the shell of many shelled animals, including molluscs and brachiopods. Among molluscs it is primarily seen in snails and clams, i.e. in gastropods and bivalves, but it is also found in cephalopods such as Allonautilus scrobiculatus. Periostracum is an integral part of the shell, and it forms as the shell forms, along with the other shell layers.

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.

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.

Distribution

This marine species occurs in the Gulf of Panama.

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References

  1. 1 2 WoRMS (2015). Borsonia saccoi Dall, 1908. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=432619 on 2016-02-29
  2. ↑ W.H. Dall (1908) Reports on the Mollusca and Brachiopoda, Bulletin of the Museum of Comparative Zoology at Harvard College. vol. 43


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