Many larval stages occur in the life history of
The life history of Fasciola includes several stages like miracidium, sporocyst, redia, cercaria and metacercaria. Other animals mentioned have a single larval stage in their life history. The life history of Pleurobrachia (Ctenophora) includes cydippid larva. The life history of Obelia (Cnidaria) includes planula larva. The life history of Nereis (Annelida) includes trochophore larva.