FIGURE 17 in Biology, morphology and taxonomy of a snail-feeding leech from North Carolina, USA, provisionally identified as Helobdella lineata (Verrill, 1874) (Glossiphoniidae): First evidence for extra-oral digestion in the Hirudinea

FIGURE 17. Dorsal view of an adult H. lineata (HL-8A) showing a spermatophore (length, 0.75 mm) (arrow) implanted in the dorsal tegument. A–C, same spermatophore at increasing magnifications. Note the tip of this spermatophore is associated with a discrete discoloured area of apparent tissue dissolution, implying enzymatic activity. Scale bars: A, 1.0 mm; B, 0.2 mm; C, 0.1 mm.