Euglesa casertana
species of mollusc
Euglesa casertanum, the pea cockle or pea clam, is a minute freshwater bivalve mollusc of the family Sphaeriidae.
Description
The shell is broad, sub-triangular or oval and is ornamented with sculpture of faint concentric striations. The umbos are slightly behind the middle. The Periostracum is silky, scarcely glossy. In colour it is whitish to grey-brown and often the shell is coated with reddish-brown deposits.
The shell is of similar shape to Sphaerium novaezelandiae but is smaller as an adult, more inflated, with a deeper hinge-plate, stronger teeth, and the ligament is not visible externally.
Length is up to 4.5 mm, height 3.7 mm, and thickness 2.3 mm.
Distribution
It has a cosmopolitan distribution and is perhaps the world's widely distributed non-marine mollusc.
British Isles - common
Ireland
Czech Republic - in Bohemia, in Moravia, least concern (LC)
Slovakia
Germany - distributed in whole Germany. High endangered (Stark gefährdet) in Hesse, critically endangered (vom Aussterben bedroht) in Saxony.
The public source identifies “Euglesa casertana” as species of mollusc. This brief keeps that definition visible, then builds a research path around Euglesa, casertana and species.
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A short description can identify a subject without explaining its stakes. For “Euglesa casertana”, the useful work is to connect “species of mollusc” to the records capable of establishing context and consequence.
Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated May 21, 2026. The linked authority identifier is Q101438537. None of the 0 selected statements returned an explicit reference.
Scientific names, classifications and consensus can change while older terminology persists in catalogues and historical literature. 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 “Euglesa casertana” 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.