Ondina obliqua

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Ondina obliqua
Ondina obliqua 001.png
Drawing of a shell of Ondina obliqua
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Heterobranchia
clade Euthyneura
clade Panpulmonata
Superfamily:
Pyramidelloidea
Family:
Pyramidellidae
Genus:
Ondina
Species:
O. obliqua
Binomial name
Ondina obliqua
(Alder, 1844) [1]
Synonyms [2]
  • Evalea obliqua Monterosato, T.A. de M. di, 1878
  • Odostomia obliquaAlder, 1844 (basionym)

Ondina obliqua is a rare species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies. [2] [3]

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

The shell reaches a length of 2.5 mm to 5 mm. The very thin, whitish shell has a transparent, glossy appearance. It has a typical intorted protoconch. The teleoconch contains five whorls, marked with fine, close spiral striae, becoming coarser on the base. The suture is deep and oblique. The outer lip is flexuous, retreating, sinuated above. It is smooth within. The columellar tooth shows only a slight obscure fold. There is no umbilicus or a very small umbilical chink. [4]

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.

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.

In anatomy, a suture is a fairly rigid joint between two or more hard elements of an organism, with or without significant overlap of the elements.

Distribution

This species occurs in the following locations: [2]

Bay of Biscay Gulf of the northeast Atlantic Ocean located south of the Celtic Sea off the west coast of France and the north coast of Spain

The Bay of Biscay is a gulf of the northeast Atlantic Ocean located south of the Celtic Sea. It lies along the western coast of France from Point Penmarc'h to the Spanish border, and the northern coast of Spain west to Cape Ortegal.

Madeira Autonomous Region of Portugal in the archipelago of Madeira

Madeira, officially the Autonomous Region of Madeira, is one of the two autonomous regions of Portugal. It is an archipelago situated in the north Atlantic Ocean, southwest of Portugal. Its total population was estimated in 2011 at 267,785. The capital of Madeira is Funchal, which is located on the main island's south coast.

Canary Islands Archipelago in the Atlantic and autonomous community of Spain

The Canary Islands is a Spanish archipelago and the southernmost autonomous community of Spain located in the Atlantic Ocean, 100 kilometres west of Morocco at the closest point. The Canary Islands, which are also known informally as the Canaries, are among the outermost regions (OMR) of the European Union proper. It is also one of the eight regions with special consideration of historical nationality recognized as such by the Spanish Government. The Canary Islands belong to the African Plate like the Spanish cities of Ceuta and Melilla, the two on the African mainland.

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References

  1. ↑ Alder J., 1844 : Descriptions of some new British species of Rissoa and Odostomia, Annals and Magazine of Natural History 13: 323-328, pl. 8
  2. 1 2 3 Gofas, S. (2011). Ondina obliqua (Alder, 1844). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=141036 on 2012-01-12
  3. ↑ Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp. 180-213
  4. ↑ G.W. Tryon, Manual of Conchology vol. VIII, p. 350; 1886


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