Nereis tricirrata sp. nov., holotype and paratype A chaetiger 5, notochaetae B, C chaetiger 5, neurochaetae D chaetiger 20, notochaetae E, F chaetiger 20, neurochaetae G chaetiger 40, notochaetae H, I chaetiger 40, neurochaetae J posterior end, notochaetae (from paratype, as blades of notochaetae missing in the posterior fragment of holotype) K, L posterior end, neurochaetae. Abbreviations: HoS, homogomph spiniger; HoF, homogomph falciger; HeS, heterogomph spiniger; HeF, heterogomph falciger; DoF, dorsal fascicle; VeF, ventral fascicle. Scale bars: 100 μm (A–L).