THE ADVENTIVE SPECIES OF THE SPRITE (MOLLUSCA, GASTROPODA, PLANOR- BIDAE) IN THE SUPERFICIAL WATER FROM UKRAINE

Abstract

A little sprite (high – 2,5-3 mm) Micromenetus dilatatus (Gould, 1841) is widespread in the various freshwater basins of North America (U.S.A. and Canada). As passive immigrant in a last third of XIX century this mollusk was found in great Britain (in the neigbourhood of Manchester), where it was in the canals, were contained by the warm sewage of the cotton manufacture. In the course following almost 150 years this species rather broadly extended into superficial waters of European continents. At present it is known from Netherlands, Belgium, Germany, France, Poland, Czech Republic. In 1991 for the first time it was reveal in the waternet of Rightcoastal Ukrain – into Dobrotvir reservoir (on the West Bug, Visla basin). Within the next almost three decades this mollusk through the water have been coursed of the water system of Dnipro – Bug canal conquered great distance on the north-last and last directions (first from Dobrotvir to extreme point of Volynian Polissya (Orikhove Lake), then – to Rivnian Polissya (Nobel Lake). How this species found oneself into Burshtyn reservoir for the present no one known. As like in the other countries from the European continents the highest production of populations of this sprite as a rule is observed in waterbodies with warm waters.