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Taxon profile

species

Thetis Peanut-shell
Cylichna thetidis Hedley, 1903

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Opistobranchia - opisthobranchs »  family Cylichnidae »  genus Cylichna

Images

Cylichna thetidis - Thetis Peanut-shell

Author: Hedley

Taxon in country check-lists*

* List of countries might not be complete

Description

Shell narrow, elongated, cylindrical, thin and glossy. Colour white. Sculpture: growth lines hardly perceptible, encircled by fine, close, incised lines; almost effaced medially, and wider spaced posteriorly. The crown concave, with a narrow axial perforation, partly roofed by a callus arch. Aperture as long as the shell, narrow above, expanded and effuse below; lined on the inner side by a sheet of callus ragged at the edge. Columella thickened, with a prominent fold, behind which a furrow runs up under the lip callus. Length, 11,5 mm.; breadth, 4,5 mm.
The " Thetis" procured this off the Manning River in 22 fathoms; and in 63-75 fathoms off Port Kembla. I have taken it on the beach in Middle Harbour.
Hedley, 1903, Scientific results of the trawling expedition of H.M.C.S. "Thetis" off the coast of New South Wales, in February and March, 1898, Part 2: Mollusca. Part II. Scaphopoda and Gastropoda.

Interchangeable taxa

The narrowly perforate summit easily distinguishes this from C. arachis, Q. and G., the only Australian shell likely to be taken for it.
The Chinese C. involuta, A. Ad., appears to resemble it more.
Hedley, 1903, Scientific results of the trawling expedition of H.M.C.S. "Thetis" off the coast of New South Wales, in February and March, 1898, Part 2: Mollusca. Part II. Scaphopoda and Gastropoda.
Author: Jan Delsing

Links and literature

EN Australian Faunal Directory [9ff440d7-11c4-4312-83b4-f1d84dd41145]

ABRS (2009-2019): Australian Faunal Directory [https://biodiversity.org.au/afd/home], Australian Biological Resources Study, Canberra [as Cylichna thetidis Hedley, 1903]
Data retrieved on: 12 July 2015
EN Galli C.: WMSDB - Wolrdwide Mollusc Species Data Base July 10, 2013 [http://www.bagniliggia.it/WMSD/WMSDhome....] [as Cylichna thetidis Hedley, 1903]
Data retrieved on: 23 November 2013

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