Adacna fragilis
species of mollusc
Adacna fragilis is a brackish-water bivalve mollusc of the family Cardiidae, the cockles. It has an oval, thin, white, pale yellow or brownish shell, up to 37 mm (1.5 in) in length, covered with narrow ribs. It lives in estuaries, lagoons and lakes around the northwestern coast of the Black Sea and in the Taganrog Bay of the Sea of Azov. The species is a filter feeder that burrows into soft silty sediments and feeds on suspended detritus. It can occur in large numbers and acts as a food source for bottom-feeding fish. Studies in the 21st century indicate a strong decline and local extinctions of some populations due to human activity such as changes in salinity caused by damming and diversion of rivers.
Taxonomy
Adacna fragilis was first described from the Dniester Liman and Lake Katlabukh by Russian geologist and paleontologist Konstantin Osipovich Milaschewitsch in 1908. It was subsequently illustrated in his posthumously published 1916 monograph on the molluscs of the Black Sea and the Sea of Azov. The specific epithet fragilis refers to the fragile shell of the species. The whereabouts of the type specimens (specimens used for the original description) are unknown.
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This entry incorporates text from “Adacna fragilis” 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.