Adult worms of Polydora websteri. a–b, Light photographs; c–f, SEM images: a, Anterior end, dorsal view, showing non-continuous bar-like pigmentation line along the groove edges of palps; b, Posterior end, ventral view, showing cup-shaped pygidium; c, Anterior chaetigers with the caruncle extending back to posterior end of chaetiger 3; d, Margin of palps on which rod-like papillae are scattered; e, Heavy spines of chaetiger 5; f, Posterior chaetigers with cup-shaped pygidium. Scale bar = 50 µm.