Figure 4 from: Richardson DJ, Moser WE, Hammond CI, Lazo-Wasem EA, McAllister CT, Pulis EE (2017) A new species of leech of the genus Placobdella (Hirudinida, Glossiphoniidae) from the American alligator (Alligator mississippiensis) in Mississippi, USA. ZooKeys 667: 39-49. https://doi.org/10.3897/zookeys.667.10680

Figure 4 - Dorsal surface, anal region. Medial row of small but distinct papillae (indicated by arrows) lying between the anus and commencement of prominent paramedial papillae, on A Placobdella rugosa (YPM 083787) B Placobdella ornata, syntype (YPM 000256) C Placobdella ali (YPM 058254) D Placobdella multilineata (YPM 083782). Scale bars: 3 mm (A), 1 mm (B), 4 mm (C), 2 mm (D).