Nipponacmea
genus of molluscs
Nipponacmea is a genus of sea snails, the true limpets, marine gastropod mollusks in the family Lottiidae.
Distribution and habitat
These species are very common among the Japanese gastropod fauna on rocks and boulders in the intertidal zone of Japanese waters and adjacent islands.
Description
The shape of the thin shell is limpet-like or patelliform. It has a medium size and has a low to medium height. The base (the aperture) has an oval shape and is longer than wide.
The color of the shell is greenish brown and characteristically bedecked with granules of fine radial riblets. . The interior is greenish blue and has a shining luster. The thin and broad interior shell margin exhibits a distinct color and texture from the adjoining area.
The shell is constituted of five layers of different structure, while the genus Notoacmea has six layers.
The gill is flaplike with a bipectinate ctenidium situated in the nuchal cavity and lacks secondary pallial gills.
“Nipponacmea” enters the record as genus of molluscs. Crown Archives preserves that source wording while asking what Nipponacmea, genus and molluscs can confirm, complicate or overturn.
Why this record matters
“Nipponacmea” is worth following because a concise public description often conceals a longer documentary argument. Here, Nipponacmea, genus and molluscs provides the most credible route into that argument.
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 Jun 3, 2026. The linked authority identifier is Q7039678. None of the 0 selected statements returned an explicit reference.
A general summary may omit uncertainty, sample limits or methodological disagreement that is explicit in the technical record. 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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This entry incorporates text from “Nipponacmea” 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.