More than 35 years later, Bdellovibrio biology is undergoing a revival owing to the original, pioneering genetics work of Thomashow and colleagues (13), which has been followed up by genome sequencing and the development of new gene inactivation methods to study the function of these bacteria (32, 42, 60).
They also have five pairs of eyes. The Freshwater Leech is a parasite that feeds on the blood of fish, frogs, turtles, and mammals. It should not be confused with other leeches, most of which prey only on insects, snails, and small creatures.
All leeches have 2 sucking discs (one at each end). The larger disc is located at the tail which is used most of the time to hold on to things. The smaller disc is the mouth area. Most anglers hook a leech around the large disc area. The large disc and small disc on a leech are also used in the reproduction process because they contain both male and female reproductive organs. There may be slight color variations from either a light brown to olive green but most are blackish.