''Hemilienardia thyridota'' 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

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

Raphitomidae Raphitomidae is a family of small to medium-sized sea snails, marine gastropod mollusks in the superfamily Conoidea.Bouchet P. & Rocroi J.-P. (Ed.) (2005). "Classification and nomenclator of gastropod families". ''Malacologia'' 47(1-2). . 39 ...

Description

The length of the shell attains 4.5 mm, its diameter 2 mm. (Original description) This is a pure white, curtly pyramidal species, the surface not shining. It contains six turreted

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, angled at the suture, ventricose, longitudinally thickly ribbed, transversely ornamented with few lirations. In the middle of the upper whorl and doubly-ranked in 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 ...

, are transverse regular deep pittings, squarrose, profound, between the ribs, which suggest the trivial name (from Ancient Greek : thyridotos : furnished with windows or doors). The aperture is narrowly oblique. The outer lip is thickened and furnished with four strong denticles. The columellar teeth are more obscure and feeble. The sinus goes deep into the outer lip. Melvill J.C. & Standen R. (1896) Notes on a collection of shells from Lifu and Uvea, Loyalty Islands, formed by the Rev. James and Mrs. Hadfield, with list of species. Part II. Journal of Conchology 8: 273-315

Distribution

This marine species occurs off the Loyalty Islands, Mactan Island, the Philippines and off

Gulf of Carpentaria The Gulf of Carpentaria (, ) is a large, shallow sea enclosed on three sides by northern Australia and bounded on the north by the eastern Arafura Sea (the body of water that lies between Australia and New Guinea). The northern boundary is ...

to Queensland, Australia

References

* Bouge, L.J. & Dautzenberg, P.L. 1914. ''Les Pleurotomides de la Nouvelle-Caledonie et de ses dependances.'' Journal de Conchyliologie 61: 123–214 * Powell, A.W.B. 1966. The molluscan families Speightiidae and Turridae, an evaluation of the valid taxa, both Recent and fossil, with list of characteristic species. Bulletin of the Auckland Institute and Museum. Auckland, New Zealand 5: 1–184, pls 1–23

External links

Hedley, C. 1922. A revision of the Australian Turridae. Records of the Australian Museum 13(6): 213-359, pls 42-56
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Gastropods.com: ''Hemilienardia thyridota ''
{{Taxonbar, from=Q61696722 thyridota Gastropods described in 1896