Katamysis warpachowskyi G.O. Sars, 1893
Common names: Russ: Myzida varpakhovskogo; Ukr: Myzida varpakhovs'kogo
Taxonomic descriptions: Single species of the genus. Tick body with exceptionally broad shell. The upper lip has a long spine. Tongue-shaped telson.
World level: EN (Endemic of the Azov-Black Sea basin)
Black Sea Regional level: EN
Subregion level: EN (Ukrainian sector)
Distribution: Endemic of the Azov-Black Sea and Caspian basins. Encountered in the lower reaches of the Dnieper, Dniester and Danube. Can swim up to 150 km in these rivers against the current. The range includes the Caspean Sea and Volga Delta (Russia). Acclimatized in the Dubossarsky water reservoir (Moldova), where it is rarely encountered today.
Habitats type, Critical habitats, Limiting factors: Bathypelagic organism. Encountered at 0.34-1.00 ppt salinity in aquatories with sandy or shell sediments, sometimes in overgrowths of higher aquatic plants.
Biology: Euryphagous. Reproduces from the beginning of March to October. After fertilization the female broods 10-22 embryos in the brood pouch. The number of generations is unknown. Length of 4.2-6.8 mm. Dark brown colour.
Population trends: Low abundance (single specimens).
Threats: Silty lower river reaches, reduction in bottom sites with hard sediments.
Conservation measures taken: Included in the Red Data Books of Ukraine and the Black Sea. Acclimatized in the Dubossarsky water reserve (Moldova).
Conservation measures proposed: Study the biology of the species. Conduct biotechnical water treatment, increase water flow in rivers etc.
Compiled by: B.Alexandrov