''Mangelia gouetensis'' is an extinct species of

sea snail Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the ...

, a marine

gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

mollusk Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is e ...

in the

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

Mangeliidae Mangeliidae is a monophyletic family of small to medium-sized, predatory sea snails, marine gastropod mollusks in the superfamily Conoidea. Bouchet, P. (2011). Mangeliidae P. Fischer, 1883. In: MolluscaBase (2016). Accessed through: World Regis ...

.Worldwide Mollusc Species Data Base : Mangelia gouetensis
/ref> The species was named after the Bois-Gouêt, where it was found.

Description

The length of the shell attains 6.5 mm, its diameter 2.75 mm. The small shell has a fusiform shape. The rather short shell contains 6 convex

whorl A whorl ( or ) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs). Whorls in nature File:Photograph and axial plane floral ...

s, separated by a deep and undulating suture. They show 12 thick and rounded axial ribs between the sutures, but not succeeding each other from one whorl to the next. They are crossed by spiral cords that do not protrude much. The

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. In gastropods In gastropods, the b ...

measures ⅔ of the total length of the shell. The

siphonal canal The siphonal canal is an anatomical feature of the shells of certain groups of sea snails within the clade Neogastropoda. Some sea marine gastropods have a soft tubular anterior extension of the mantle called a siphon through which water is ...

is short. The

aperture In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane. An opt ...

is oval. The outer lip is oblique, thickened by the last rib with a notch above the suture. The columellar margin is thin an narrow.

Distribution

This extinct marine species was found in

Eocene The Eocene ( ) Epoch is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene' ...

strata of

Brittany Brittany (; french: link=no, Bretagne ; br, Breizh, or ; Gallo language, Gallo: ''Bertaèyn'' ) is a peninsula, Historical region, historical country and cultural area in the west of modern France, covering the western part of what was known ...

, France.

References

* Cossmann (M.), 1896 ''Mollusques éocèniques de la Loire-Inférieure. Tome 1, fascicule 2.'' Bulletin de la Société des Sciences Naturelles de l'Ouest de la France, t. 6, vol. 4, p. 180-246 (

External links

Cossmann (1898), Mollusques éocéniques de la Loire-inférieure, Nantes :Pequignot,1895-1922
{{Taxonbar, from=Q39091202 gouetensis Gastropods described in 1896