''Circumstella devexa'' 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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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 Liotiidae
Liotiidae is a family of small sea snails, marine gastropod mollusks in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).Gofas, S. (2013). Liotiidae Gray, 1850. Accessed through: World Register of ...
.
[Marshall, B. (2013). Circumstella devexa (Hedley, 1901). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=719263 on 2013-08-2]
Description
(Original description by Charles Hedley) The height of the shell attains 3.3 mm. The very solid, widely umbilicate shell has a turbinate shape with the whorls in transverse section nearly square. The colour of the dull shell is creamy white. It contains 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. The upper two whorls are unsculptured, the last descending steeply and suddenly. The whole surface is densely covered by fine, close, radiating threads. The periphery is flattened, with a keel at the upper and lower angles, the superior crenulated. Outside the deeply impressed
suture runs a row of denticules. The base of the shell is flattened. The abrupt margin of the
aperture is scalloped. The very oblique aperture is semilunate with two massive lips, one within the other.
Hedley, C. 1901. ''Studies on Australian Mollusca. Part IV.'' Proceedings of the Linnean Society of New South Wales 26: 16-25 (8, pl. 2, figs 4-6)
/ref>
Distribution
This marine species occurs off the Northern Territory and Queensland, Australia
References
* Sowerby, G.B. III,1908. ''Descriptions of eight new species of marine mollusca''. Proceedings of the Malacological Society of London 8: 16-19, pl. 11 6, pl. 1, fig. 2
* Jenkins, B.W. 1984. ''Northern Australian Liotiidae''. Australian Shell News 48: 8-9
* Wilson, B. 1993. ''Australian Marine Shells. Prosobranch Gastropods''. Kallaroo, Western Australia : Odyssey Publishing Vol. 1 408
External links
To World Register of Marine Species
Australian Faunal Directory: ''Circumstella devexa''
{{Taxonbar, from=Q13468336
devexa
Gastropods described in 1901