''Homalopoma paucicostatum'', common name the few-ribbed dwarf turban, 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 ...
with
calcareous opercula, a
marine
Marine is an adjective meaning of or pertaining to the sea or ocean.
Marine or marines may refer to:
Ocean
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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 Colloniidae
Colloniidae is a family of small sea snails with calcareous opercula, marine gastropod mollusks in the clade Vetigastropoda.MolluscaBase eds. (2020). MolluscaBase. Colloniidae Cossmann, 1917. Accessed through: World Register of Marine Species at ...
.
[Rosenberg, G. (2012). ''Homalopoma paucicostatum'' (Dall, 1871). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=528073 on 2013-02-10]
Described
As attested by the epithet, the small, depressed-globose shell of this species has few, prominent spiral ribs. The shell grows to a height of 4 mm. The shell is solid and imperforate. The four
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 rapidly increase and are very strongly spirally lirate. There are seven to eight lirae 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 ...
, separated by deep grooves, in which incremental strife are evident. The
sutures are canaliculate. The
aperture is contracted and pearly white within. The
columella ends in a callous tubercle. The color of the shell is rusty brown or rose-red, frequently with alternating white spots on the ribs. The interstices are generally lighter, sometimes pure white.
G.W. Tryon (1888), Manual of Conchology X; Academy of Natural Sciences, Philadelphia
/ref>
Distribution
This is a fairly common species living at low tide in sand, under rocks and on broken shells in the Pacific Ocean off California.
References
External links
Biodiversity Heritage Library (3 publications)
Encyclopedia of Life
USNM Invertebrate Zoology Mollusca Collection
USNM Invertebrate Zoology Mollusca Collection
ITIS
World Register of Marine Species
{{Taxonbar, from=Q3710005
Colloniidae
Gastropods described in 1871