Figure 9 in Recent evolution of ancient Arctic leech relatives: systematics of Acanthobdellida

Figure 9. Scanning electron micrographs of gonopores and posterior body regions. A, B, gonopores in a small Acanthobdella peledina (4 mm; Alaska; A) and a large Paracanthobella livanowi (11 mm; Kamchatka; B). C, D, the posterior body region for a medium-sized A. peledina (7 mm; Sweden; C) and a medium-sized P. livanowi (6 mm; Kamchatka; D). Double arrows indicate the posterior sucker; f, female gonopore; m, male gonopore; s, opening of the spermatheca. Dotted lines and Roman numerals denote segments.