''Eurytrochus concinnus'' 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: Ocean * Maritime (disambiguation) * Marine art * Marine biology * Marine debris * Marine habitats * Marine life * Marine pollution Military * ...

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 Trochidae, the top snails.Marshall, B. (2014). Eurytrochus concinnus (Pilsbry, 1890). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=719224 on 2014-03-05 This species was attributed to

Wilhelm Dunker Wilhelm Dunker, full name Wilhelm Bernhard Rudolph Hadrian Dunker (21 February 1809, Eschwege – 13 March 1885, Marburg) was a German geologist, paleontologist and zoologist (specifically a malacologist). Wilhelm Dunker studied mining and ...

by H.A. Pilsbry, 1890 as ''Gibbula concinna'' Dunker (Manual of Conchology vol. 11, p. 230) but apparently it was a manuscript name that was mentioned in several publications (see references) but was not described by Dunker. The accepted name therefore dates from Pilsbry who provided the first description and illustrations.

Description

The size of the shell attains 4 mm, its diameter 4–6 mm. The small, solid shell has a globose-depressed-conical shape. It is narrowly umbilicate. It is lusterless, soiled whitish or yellowish, with either a series of dark flammules below the sutures. The base of the shell is faintly articulated with dark, or else. The entire surface is mottled andnearly covered with blackish. 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 ...

is obtusely subangular, and descends a trifle anteriorly. The sutures are narrowly but decidedly impressed. The penultimate whorl has 7 or 8 equal strong spiral lirae, as wide as the interstices, which are densely obliquely striate and have usually a few indistinct spiral striae. The base has about 10 concentric liruase. The rounded aperture is very oblique, thickened with opaque white within. Its edge is crenulated. The narrow umbilicus is bounded by an indistinctly crenulated rib, strongly grooved within. The upper one or two lirae are more or less beaded, and sometimes all of them are. The interstices are sometimes wider than the lirae, and have numerous quite distinct spiral striae.Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia
(described as ''Gibbula concinna'' Dunker)

Distribution

This marine species occurs in the Pacific Ocean off Samoa and off Queensland, Australia.

References

* Museum, Godeffroy Catalog V, p. 147 * Cat. der Conchyl.-Samml. von Fr. Paetel, 8te lieferung, p. 569 * Proc. Cal. Acad. Sci. iv, p. 201

External links

World Register of Marine Species

Atlas of Living Australia: ''Gibbula concinna''
{{Taxonbar, from=Q13629609 concinnus Gastropods described in 1890