Dendrodoris fumata 
Dendrodoris guttata 
Dendronotus regius 
Dermatobranchus albus 
Dermatobranchus funiculus 
Dermatobranchus ornatus 
Desirable Flabellina 
Diamond squid 
Diana's Chromodoris 
Diminovula culmen 
Diversidoris crocea 
Diversidoris flava 
Dog whelk 
Dondersia annulata 
Doriprismatica sibogae 
Doriprismatica stellata 
Doris immonda 
Doto greenamyeri 
Doto ussi 
Dotted nudibranch 
Draparnaud's Glass Snail 
Drymaeus vincentinus 
Dusky Arion 
Dwarf cuttlefish