Eudontomyzon mariae (Ukranian Brook Lamprey) is a species of lampreys in the family northern lampreys. It is associated with freshwater habitat. Individuals can grow to 22.2 cm. Reproduction is dioecious.
Definition: length from the tip of the snout to the tip of the longer lobe of the caudal fin, usually measured with the lobes compressed along the midline. It is a straight-line measure, not measured over the curve of the body