Paragnaths A P-bar paragnaths Pseudonereis anomala B conical paragnaths Pseudonereis trimaculata C rod-like paragnaths Platynereis polyscalma D smooth bar paragnaths Perinereis vancaurica E pyramidal paragnaths Perinereis akuna F crown paragnaths Micronereis piccola G shield-shaped paragnaths Pseudonereis trimaculata. Sources: A–E, G emended from Bakken et al. (2009: figs 2–5) F emended from Paxton (1983: fig. 4). Scale bars: 0.1 mm (A–E, G); 200 μm (F).