Cephalaspidea
Cephalaspidea are the headshield slugs and bubble snails. Their head is covered by a broad, shovel-like shield used to plough through sand. Many have a thin external or internal shell. The group includes herbivorous bubble snails (Haminoeidae) and fast predators such as Aglajidae (Chelidonura, Philinopsis), which track prey by chemical trails, and the swimming Gastropteridae.
A smooth, shield-like head with no rhinophores or tentacles, often a rear shield and tail lobes; side flaps (parapodia) fold up over the body. Shells, when present, are thin bubble shells.
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