''Gymnobela lineola'' 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

Raphitomidae Raphitomidae is a family of small to medium-sized sea snails, marine gastropod mollusks in the superfamily Conoidea.Bouchet P. & Rocroi J.-P. (Ed.) (2005). "Classification and nomenclator of gastropod families". ''Malacologia'' 47(1-2). . 39 ...

.MolluscaBase (2019). MolluscaBase. Gymnobela lineola (Dall, 1927). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=532894 on 2019-05-09

Description

The length of the shell attains 5.5 mm, its diameter 2.25 mm. (Original description) The small, thin, white shell has a sinusigera

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 ...

of 2½ brown

whorls 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 d ...

, followed by 3½ subsequent well rounded whorls. The suture is closely appressed, somewhat constricted;. The

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 ...

is deep and wide. The fasciole is close to the suture, crossed by retractively arcuate wrinkles. The axial sculpture consists of about 16 very narrow sharp ribs, with much wider interspaces, completely crossing the whorls except the anal fasciole. The spiral sculpture consists of (on 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 ...

6) slender threads with much wider interspaces, so that the interstices of the reticulation are nearly square. 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 finely spirally threaded. The columella is short, straight, attenuate in front, gyrate, with pervious axis. The aperture is narrow. The outer lip is thin and arcuately produced in front.Dall, William Healey. "Small shells from dredgings off the southeast coast of the United States by the United States Fisheries Steamer Albatross in 1885 and 1886." Proceedings of the United States National Museum (1927)

Distribution

This species occurs in the Atlantic Ocean off Cumberland Island, Georgia at a depth of 538 m.

References

External links

* {{DEFAULTSORT:Gymnobela Lineola lineola Taxa named by William Healey Dall Gastropods described in 1927