''Oenopota amiata'' is a 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 in the family Mangeliidae.Dall (1919) Descriptions of new species of Mollusca from the North Pacific Ocean; Proceedings of the U.S. National Museum, vol. 56 (1920)

Description

The length of the shell attains 15 mm, its diameter 7 mm. (Original description) The shell is elevated and rugose. its color is white under a pale yellow

periostracum The periostracum ( ) is a thin, organic coating (or "skin") that 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 ...

. It contains six subtabulate

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. The

protoconch A protoconch (meaning first or earliest or original shell) 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 ...

is decorticated,. The suture is obscure and closely appressed. The spiral sculpture consists of an angle at the shoulder, between "v/hich" and the suture are four or five close-set small equal threads. In front of the shoulder is a constriction beyond which are about a dozen deep grooves with wider rounded interspaces which are finely spirally striated. On 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 ...

there are crowded small threads. The axial sculpture consists of about 15 short ribs extending from the shoulder, which they nodulate, to the periphery only. The aperture is narrow with a shallow

anal sulcus The anal sulcus, also called the anal sinus or anal canal, in Gastropods is a notch, a shelly tube at the top of the aperture In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and fo ...

. The outer lip thin, the inner lip is erased. The siphonal canal is straight and short

Distribution

This marine species occurs off Belkoffski, Alaska.

References

External links

* * {{DEFAULTSORT:Oenopota Amiata

amiata Mount Amiata is the largest of the lava domes in the Amiata lava dome complex located about 20 km northwest of Lake Bolsena in the southern Tuscany region of Italy. It is located within the provinces of Grosseto and Siena. Geology Mount A ...

Gastropods described in 1919