''Perrinia squamicarinata'' 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 Marine is an adjective meaning of or pertaining to the sea or ocean. Marine or marines may refer to: Ocean * Maritime (disambiguation) * Marine art * Marine biology * Marine debris * Marine habitats * Marine life * Marine pollution Military * ...

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 Chilodontidae.Bouchet, P. (2012). ''Perrinia squamicarinata'' (Schepman, 1908). Retrieved through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=547176 on 2013-04-14Poppe G.T., Tagaro S.P. & Dekker H. (2006) The Seguenziidae, Chilodontidae, Trochidae, Calliostomatidae and Solariellidae of the Philippine Islands. Visaya Supplement 2: 1-228.

Description

(Original description by M.M. Schepman) The size of the shell varies between 4.5 mm and 7 mm. The shell has an elevated-conical shape with slightly convex sides. It is yellowish grey, with dark brown spots at the upper part of

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 and below the periphery. The 6½ narrowly perforate whorls are slightly convex, with a prominent keel. The blunt nucleus is rather smooth, followed by a whorl which is simply costate. The other whorls have 3 spiral lirae, crossed by ribs, which form blunt spines on the upper spiral, round beads on the median one and compressed, spinelike squamae (decumbent scales) on the third spiral or peripheral keel. 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 ...

these ribs become lamellose and double, each rib consisting of about 2 lamellae. The sutures are deeply channelled. The base of the shell is convex, with 5 beaded spirals and lamellose ribs. Moreover the whole shell is covered with microscopic growth-striae. The narrow umbilicus is partly covered by the columellar margin. The aperture is subquadrangularly rounded. The outer and basal margins are rounded in outline, thin, thickened interiorly, with 10 spiral lirae. The columellar margin is cylindrical, only slightly curved, with a rather strong transverse fold. Its base runs without angle in the basal margin, and is slightly expanded over the umbilicus. Its upper part is connected by a thin layer with the outer margin.

Distribution

This marine species occurs off the Philippines.

References

External links

To Encyclopedia of Life

To World Register of Marine Species

Gastropods.com: ''Perrinia squamicarinata''
{{Taxonbar, from=Q14656943 squamicarinata Gastropods described in 1908