''Perrinia nigromaculata'' 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:
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* Maritime (disambiguation)
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* ...
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 nigromaculata'' (Schepman, 1908). Retrieved through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=547178 on 2013-04-14]
Description
(Original description by M.M. Schepman) The size of the shell varies between 8 mm and 13 mm.
The imperforate shell has an elevated-conical shape with convex sides. It is yellowish-white, with black-brown square spots, running from the
suture to the keel, and more numerous narrow spots and streaks of the same colour on the base. The nucleus is wanting; the 7½ remaining whorls are slightly convex. They are separated by a narrow channelled
suture. The upper whorls are slightly worn, with 3 and 4 spiral lirae, which increase to 5 in number on the last 4 or 5 whorls. They are crossed by slightly undulating ribs, with beads where they cross each other, the lowest of the lirae forming the peripheral keel is the largest, and on this one the beads have a tendency to become squamate, (but not so much as in the preceding species). 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 ...
descends in front and here the ribs form irregular lamellae. The periphery of body whorl is angular. The base of the shell is convex, with 5 spiral, beaded lirae, the
interstices with strong, irregular lamellae. The
aperture nearly round, angular at the upper part and very faintly so at the base of the
columella. The outer and basal margins are thin, thickened interiorly, with 10 conspicuous lirae, that nearest the columella toothlike. The columella is cylindrical, with a groove round its upper part, running at its left side towards a square notch, formed by a square, toothlike fold at the basal part and the most proximal of the internal lirae of the base. Below the notch there are one large and two small denticles. The parietal wall is callous.
Schepman 1908-1913, The Prosobranchia of the Siboga Expedition; Leyden,E. J. Brill,1908-13
(described as ''Calliostoma (Perrinia) nigromaculatum'')
Distribution
This marine species occurs off the Philippines and off Sulawesi
Sulawesi (), also known as Celebes (), is an island in Indonesia. One of the four Greater Sunda Islands, and the world's eleventh-largest island, it is situated east of Borneo, west of the Maluku Islands, and south of Mindanao and the Sulu Ar ...
, Indonesia.
References
External links
To Encyclopedia of Life
To World Register of Marine Species
*
{{Taxonbar, from=Q14656940
nigromaculata
Gastropods described in 1908