Structural Characteristics of the Caspian Invader Leech Archaeobdella esmonti Grimm in the Rybinsk Reservoir

摘要

The leech Archaeobdella esmonti Grimm, a representative of the Caspian fauna, was found for the first time in the Rybinsk Reservoir in June 2009. Its maximum abundance was recorded on the biotope of gray silts with sheU rock (depth of 14 m). The sizeand mass characteristics of A esmonti in the Rybinsk Reservoir varied in a wide range depending on the season of observations. The maximum sizes of individuals exceeded those recorded in mesohalinic waterbodies.