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1.           Segment VII dorsal surface with a brown, horny, chitinous scute (nuchal plate);               6 pairs of testisacs. . . . . . . . . . . . . . . . . . . . . . . Helobdella cf. stagnalis

             Without a nuchal plate, dorsal surface smooth, unpigmented and translucent;               body rounded and subclindrical; lateral margins almost parallel' posterior sucker               small and terminal; one pair of crop caeca; langth 25 mm. . . . . . . . . . . . . . . .               . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Helobdella elongata

Key to Species of Helobdella

Modified from Moser, et al. (2016)

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