''Calliotropis spinulosa'' is a species of small

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

Eucyclidae Eucyclidae is a family of gastropods in the superfamily Seguenzioidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). This family has no subfamilies. Genera Genera within the family Eucyclidae include: * '' Amberley ...

Description

(Original description by Schepman) The shell grows to a height of 5 mm. The yellowish-white shell is depressed, with a low conical, convex spire. It is strongly keeled and has a convex base. The umbilicus is large. The shell (not adult) consists of about 5 slightly 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, with a conspicuous suture. The sculpture consists of 2 spiral rows of short, thick tubercles, 15 or 16 in number 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 ...

, resembling small spines. One row borders a depression at the upper part of the whorls, the other near the base The tubercles are connected by traces of spiral lirae. On the upper whorls the tubercles are connected by concentric ribs. The keel, visible on the penultimate whorl, is very conspicuous. It is crenulated by slightly erect tubercles. The base of the shell is convex, with four beaded, spiral lirae, and two intermediate ones near the aperture; that bordering the umbilicus is the strongest. The funnel-shaped umbilicus is pervious. Its largest diameter occupies about 2/5 of that of the shell. Its walls are finely striate, like the whole surface of the shell. The aperture is rhombic, its upper margin convex, the basal one nearly straight. The columellar margin is slightly convex. The interior is smooth.Schepman 1908–1913, The Prosobranchia of the Siboga Expedition; Leyden, E. J. Brill, 1908–13
(described as ''Solariellopsis spinulosa'')

Description

Distribution

References

External links