''Clypeostoma cancellatum'' is a
species
In biology, a species is the basic unit of Taxonomy (biology), classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of ...
of
sea snail, a
marine
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gastropod mollusk
Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is es ...
in the
family
Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...
Chilodontidae.
[MolluscaBase eds. (2021). MolluscaBase. Clypeostoma cancellatum (Schepman, 1908). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=986595 on 2021-12-28]
Description
(Original description by M.M. Schepman) The size of the shell varies between 7 mm and 12 mm.
The elevated-conical, imperforate shell has convex sides. It is yellowish-white, with a nacreous lustre and numerous yellowish-brown spots, which are darker near the upper part of each
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 flo ...
and on the third whorl, the first and second being without markings. The nucleus is wanting, remaining five, slightly convex whorls with a narrow canaliculate
suture. The first whorl has rather distant ribs. The next whorls have 3 spiral lirae (fine linear elevations) and radiating ribs. The last 3 whorls contain 5 spirals and thinner radiating ribs, which make the shell cancellated. These ribs become lamellose (with flared axial projections) on the lower whorls. The lirae are beaded where the ribs cross them, less obvious on the lower whorls, the uppermost of the lirae on each whorl with a series of small tubercles, giving a coronated appearance to the whorls. The
body whorl is rounded, the peripheral spiral being only very little prominent. The base of the shell is convex, with 6 beaded lirae, cancellated by numerous, irregular, radiating ribs. The
aperture
In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane.
An ...
is nearly rounded. The outer and basal margins are rounded, thin, thickened interiorly, with about 17 short lirae on the internal rib, of which that near the
columella
Lucius Junius Moderatus Columella (; Arabic: , 4 – ) was a prominent writer on agriculture in the Roman Empire.
His ' in twelve volumes has been completely preserved and forms an important source on Roman agriculture, together with the ...
slightly tooth-like. The columella is cylindrical, rather straight, with a tooth-like fold at the base, bordering a rounded notch. The parietal wall is callous. The interior of the aperture has a few grooves.
Schepman 1908-1913, The Prosobranchia of the Siboga Expedition; Leyden,E. J. Brill,1908-13
(described as ''Calliostoma (Perrinia) cancellatum'' )
Distribution
This marine species occurs off Timor
Timor is an island at the southern end of Maritime Southeast Asia, in the north of the Timor Sea. The island is divided between the sovereign states of East Timor on the eastern part and Indonesia on the western part. The Indonesian part, al ...
, Indonesia.
References
* Vilvens, C. (2017). New species and new records of Chilodontidae (Gastropoda: Vetigastropoda: Seguenzioidea) from the Pacific Ocean. Novapex, Hors Série. 11: 1-67
External links
To Encyclopedia of Life
To World Register of Marine Species
*
{{Taxonbar, from2=Q14656927, from1=Q61700520
cancellatum
Gastropods described in 1908