Aorotrema cistronium

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Aorotrema cistronium
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked):clade Caenogastropoda
clade Hypsogastropoda
clade Littorinimorpha
Superfamily: Truncatelloidea
Family: Tornidae
Genus: Aorotrema
Species:A. cistronium
Binomial name
Aorotrema cistronium
(Dall, 1889)
Synonyms

Cyclostrema cistroniumDall, 1889

Aorotrema cistronium is a minute sea snail, a marine gastropod mollusc in the family Tornidae. [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".

Tornidae family of molluscs

Tornidae is a family of very small and minute sea snails with an operculum, marine gastropod mollusks in the clade Littorinimorpha. This family used to be known as the Vitrinellidae. Iredale has shown that the family Adeorbidae Monterosato, 1884 should be called Tornidae

Contents

Description

(Original description by W. H. Dall) The height of the shell attains 2.5 mm. The maximum diameter is 2 mm. The small, white shell has a polished nucleus, one and a half rounded and as many more carinated whorls. The spire is depressed. The radiating sculpture consists of fine close flexuous threads, which appear chiefly in the interspaces of the spirals, giving the surface a minutely punctate appearance. These extend over the whole surface except of the nuclear whorls. The spiral sculpture consists of on the summit seven or eight, between the carinae six or eight, and on the base ten or fifteen extremely fine threads. These are even and uniform, with about equal interspaces, some a little granular from the radiating sculpture. Beside these there are three very strong carinae;. One forms the margin of the nearly flat spire, the second extends horizontally just below the periphery. The space between them is deeply excavated. The third forms the edge of the funicular, narrow, deep umbilicus. The base is conical, excavated just within the peripheral carina. It rises to the edge of the umbilicus, which is marked by a strong thread, and within is vertically striated. The body whorl descends from the general plane, and finally becomes separated from the body whorl. The simple margin is sharply angulated by the carinations, otherwise the aperture would be ovate, with the columellar side somewhat excavated. [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.

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.

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.

Distribution

This species occurs in the Atlantic Ocean off North Carolina and in the Gulf of Mexico off Texas at depths between 14 m and 115 m. [3]

North Carolina State of the United States of America

North Carolina is a state in the southeastern region of the United States. It borders South Carolina and Georgia to the south, Tennessee to the west, Virginia to the north, and the Atlantic Ocean to the east. North Carolina is the 28th-most extensive and the 9th-most populous of the U.S. states. The state is divided into 100 counties. The capital is Raleigh, which along with Durham and Chapel Hill is home to the largest research park in the United States. The most populous municipality is Charlotte, which is the second-largest banking center in the United States after New York City.

Texas State of the United States of America

Texas is the second largest state in the United States by both area and population. Geographically located in the South Central region of the country, Texas shares borders with the U.S. states of Louisiana to the east, Arkansas to the northeast, Oklahoma to the north, New Mexico to the west, and the Mexican states of Chihuahua, Coahuila, Nuevo León, and Tamaulipas to the southwest, while the Gulf of Mexico is to the southeast.

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References

  1. ↑ Bouchet, P. (2013). Aorotrema cistronium (Dall, 1889). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=419650 on 2013-08-27
  2. ↑ Dall W. H. 1889. Reports on the results of dredging, under the supervision of Alexander Agassiz, in the Gulf of Mexico (1877-78) and in the Caribbean Sea (1879-80), by the U.S. Coast Survey Steamer "Blake", Lieut.-Commander C.D. Sigsbee, U.S.N., and Commander J.R. Bartlett, U.S.N., commanding. XXIX. Report on the Mollusca. Part 2, Gastropoda and Scaphopoda. Bulletin of the Museum of Comparative Zoölogy at Harvard College 18: 1-492, pls. 10-40 (described as Cyclostrema cistronium)
  3. ↑ Welch J. J. (2010). "The “Island Rule” and Deep-Sea Gastropods: Re-Examining the Evidence". PLoS ONE 5(1): e8776. doi:10.1371/journal.pone.0008776.
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