Lobiger souverbii 
Loch's Chromodoris 
Lomanotus vermiformis 
Lucilina lamellosa 
Luria lurida 
Lutraria rhynchaena 
Lyre Cranch Squid 
Mangrove Periwinkle 
Map cowry 
Margarita Egg Cowry 
Margined Ram's-Horn 
Marianina rosea 
Marionia arborescens 
Marionia elongoviridis 
Marionia pustulosa 
Marten's Sidegill Slug 
Mask Limpet 
Mediterranean Limpet 
Mediterranean mussel 
Mediterranean Violet Aeolid 
Megaustenia heliciformis 
Meghimatium pictum 
Melarhaphe neritoides 
Melibe coralophilia