Light micrographs showing the morphologies of living spionid larvae of genera Boccardia, Boccardiella, and Dipolydora A, B Boccardia proboscidea, dorsal view of accidentally hatched 9‐chaetiger (A) and 15‐chaetiger larvae (B) C Boccardia pseudonatrix, dorsal (left) and ventral (right) view of accidentally hatched 10‐chaetiger larvae D–F Boccardia sp. 1, dorsal view of 9‐chaetiger (D) and dorsal (E) and ventral view (F) of 17‐chaetiger larvae G Boccardia sp. 2, dorsal view of 15‐chaetiger larva H, I Boccardiella hamata, dorsal view of 16‐chaetiger (H) and 18‐chaetiger larvae (I) J, K Dipolydora bidentata, dorsal view of 13‐chaetiger (J) and 18‐chaetiger larvae (K) L Dipolydora cf. commensalis, dorsal view of 21‐chaetiger larva M, N Dipolydora giardi, dorsal view of 19‐chaetiger (M) and lateral view of 21‐chaetiger larvae (N) O Dipolydora cf. socialis, dorsal view of 18‐chaetiger larva P Dipolydora sp., dorsal view of 7‐chaetiger larva. Scale bars: 300 μm.