Eurytrochus concinnus

Eurytrochus concinnus is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.[1]

Eurytrochus concinnus
Original drawing with two views of a shell of Eurytrochus concinnus
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Clade: Vetigastropoda
Order: Trochida
Superfamily: Trochoidea
Family: Trochidae
Genus: Eurytrochus
Species:
E. concinnus
Binomial name
Eurytrochus concinnus
(Pilsbry, 1890)
Synonyms

Gibbula concinna Pilsbry, 1890

This species was attributed to Wilhelm Dunker 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.[1]

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 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.[2]

Distribution

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

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References
  1. 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
  2. Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia (described as Gibbula concinna Dunker)
  • Museum, Godeffroy Catalog V, p. 147
  • Cat. der Conchyl.-Samml. von Fr. Paetel, 8te lieferung, p. 569
  • Proc. Cal. Acad. Sci. iv, p. 201
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