wat kind of fertilisation takes place in annelids molluscsechinodermata

In Annelids external fertilisation takes place in dioecious organism and internal fertilisation in monoecious or hermaphroditic organism.
 
In molluscs, fertilization is either internal or external (dioecious animals).
 
In echinoderms, fertilization in echinoderms is external with only few species having internal fertilization.