Margarites laminarum

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Margarites laminarum
Margarites laminarum 001.jpg
Original drawing with two views of a shell of Margarites laminarum
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Clade: Vetigastropoda
Superfamily: Trochoidea
Family: Turbinidae
Genus: Margarites
Species:M. laminarum
Binomial name
Margarites laminarum
(Jeffreys, 1883)
Synonyms
  • Solariella laminarum(Jeffreys, 1883)
  • Trochus laminarumJeffreys, 1883 (original description)

Margarites laminarum is a species of sea snail, a marine gastropod mollusk in the family Margaritidae. [1] [2]

In biology, a species ( ) is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. While these definitions may seem adequate, when looked at more closely they represent problematic species concepts. For example, the boundaries between closely related species become unclear with hybridisation, in a species complex of hundreds of similar microspecies, and in a ring species. Also, among organisms that reproduce only asexually, the concept of a reproductive species breaks down, and each clone is potentially a microspecies.

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".

Contents

Description

(Original description by Gwyn Jeffreys) The rather thin shell has a conical shape. It is semitransparent, and lustreless. Its sculpture shows numerous thin and delicate, but jagged and irregular curved laminae in the line of growth, which do not extend to the umbilicus. There are about 40 on the body whorl, some of them double. The interstices are quite smooth. The colour of the shell is light yellowish-brown. The spire israised. The shell contains 6 whorls. These are convex and rounded. The body whorl is equal to about two fifths of the spire. The apex is twisted. The suture is distinct. The aperture is nearly circular. The outer lip is thin, but thicker and expanded at the base and partly folded over the umbilical perforation. The umbilicus is somewhat concave, with a small perforation. [3]

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.

Umbilicus (mollusc)

The umbilicus of a shell is the axially aligned, hollow cone-shaped space within the whorls of a coiled mollusc shell. The term umbilicus is often used in descriptions of gastropod shells, i.e. it is a feature present on the ventral side of many snail shells, including some species of sea snails, land snails, and freshwater snails.

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.

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References

  1. Gofas, S. (2012). Margarites laminarum (Jeffreys, 1883). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=585908 on 2012-09-01
  2. Hoffman L., van Heugten B. & Lavaleye M.S.S., 2011. Margarites toroides n.sp. (Turbinidae, Gastropoda) off the northwestern Moroccan Coast, northeastern Atlantic Ocean. Miscellanea Malacologica 5(3): 57-60
  3. Jeffreys, J Gwyn (1883), On the Mollusca procured during the ‘Lightning’ and Porcupine' Expeditions; Proceedings of the Zoological Society of London (1883)