''Clelandella perforata'' 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 Trochidae, the top snails.
Description
The height of the shell varies between 6 mm and 9 mm, with a tiny
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 less than one
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 ...
and a
teleoconch up to 5-6 whorls. The
sculpture consists of beaded spiral cords as wide as the interspaces, one of which is concealed by the
suture and continued on peripheral angle of 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 ...
. The profile of first teleoconch whorl is convex, of the later whorls less so but swollen subsuturally, with a suture somewhat canaliculated. The abapical surface is slightly convex, bearing 6-10 spiral cords, as wide as the interspaces, crossed by growth lines but not beaded. The axis has a distinct
umbilicus, bordered by the columellar edge. The shell colour is whitish with nacre generally showing through, some specimens without pattern, others with broad brown or reddish flames starting from the suture and with a peripheral rim white articulated by brown streaks. The others show adapical cords and a peripheral rim articulated. The abapical cords are generally colourless, sometimes articulated.
Distribution
This species occurs in the Northeast Atlantic at the Great Meteor Bank.
References
External links
*
{{DEFAULTSORT:Clelandella Perforata
perforata
Gastropods described in 2005