Embryos and larvae of Aeolidiella stephanieae. Light micrographs. Anterior faces upwards and scale bars represent 100 μm in all aspects. B, C and F are in dorsal view whereas D and E are in lateral view. (A) 2 h after oviposition (0% of development); zygotes (zy) and four-celled embryos (asterisk) within the same egg mass; cap marks the capsule that surrounds each embryo. (B) Early veliger stage larva (5% of development) with a shell (s) and a ciliated velum (v). (C) Veliger stage larva (12% of development) with eyes (e) and elaborated larval foot (propodium) (pp). (D) Hatched larva (20% of development) with the operculum (o) that is attached to the metapodium (mp). (E) Retracted and settled larva in metamorphosis (25% of development). (F) Early juvenile stage Aeolidiella (j; 30% of development) is crawling out of the shell and marking the end of the metamorphosis.