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Taxon profile

species

Obtusella tumidula (G.O. Sars, 1878)

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Littorinimorpha »  family Rissoidae »  genus Obtusella

Scientific synonyms

Onoba tumidula G. O. Sars, 1878

Images

Obtusella tumidula

Author: Kantor & Sysoev

Obtusella tumidula

Author: Sars, G.O.

Obtusella tumidula

Author: Warén, A.

Taxon in country check-lists*

Arctic, Europe: Iceland, Norway, Russia, North America: Bering Sea

* List of countries might not be complete

Taxonomy

As Putila tumidula
The local occurrence of an animal under this name is shown in Seaward's Atlas (1982) in waters between Scotland and the Faeroes. Precisely what animal this refers to must be regarded as highly doubtful- A description of an animal under this name was given by Nordsieck (1972): it was said to have a small shell of about four whorls marked with faint spiral lines. His illustration (source not given) suggests a shell not unlike that of Obtusella intersecta but broader, with more tumid whorls and a longer aperture and more conspicuous umbilical groove. The shell is described as thin, yellowish, and up to 2.5 mm in height and 1.75 mm in breadth, the last whorl occupying about 70% of the total height and the aperture about half.
Two comments must be made. The description agrees with that of Cingula tumidula Sars, 1878, and may well have derived from that, but according to Warén (1974) the holotype of the species, which has now been destroyed by preservation in an acidic glass tube, was 'the only known specimen'. If this is so then the local record may rest on a misidentification. The second comment to be made is that Ponder (1985) regards Putilla as a skeneid rather than a rissoid, but it is not clear that both Ponder and Nordsieck are making use of the name Putilla in the same sense.
Graham, A.; 1988. Molluscs: Prosobranch and Pyramidellid Gastropods
Author: Jan Delsing

Links and literature

EN Galli C.: WMSDB - Wolrdwide Mollusc Species Data Base July 10, 2013 [http://www.bagniliggia.it/WMSD/WMSDhome....] [as Obtusella tumidula (Sars, 1878)]
Data retrieved on: 22 November 2013

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