Rissoa membranacea
species of mollusc
Rissoa membranacea is a species of small sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae.
Description
The length of the shell varies between 4 mm and 11 mm.
Distribution
This species occurs in the Atlantic Ocean from Western nOrway to the British Isles; in the Mediterranean Sea in the Alboran Sea.
References
Risso, A., 1826 - Histoire naturelle des principales productions de l'Europe Méridionale et particulièrement de celles des environs de Nice et des Alpes-Maritimes. Mollusques, vol. 4, p. 1-439, 12 pls
Arnaud, P. M., 1978. - Révision des taxa malacologiques méditerrannéens introduits par Antoine Risso. Annales du Muséum d'Histoire Naturelle de Nice "1977"5: 101-
External links
Adams, J. (1800). Descriptions of some minute British shells.
Begin with the source’s own compact description: “Rissoa membranacea” is species of mollusc. The dossier treats that line as a proposition to test through Rissoa, membranacea and species, not as a finished interpretation.
Why this record matters
The phrase “species of mollusc” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated May 19, 2026. The linked authority identifier is Q3175091. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1826, 1978, 1977 and 1800.
Current terminology should not be projected backward without checking the classification used when the underlying evidence was created. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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Primary datasets, specimen catalogues, standards bodies and the most recent peer-reviewed literature.
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Questions for further research
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This entry incorporates text from “Rissoa membranacea” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.