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Cephalaspidea
The order Cephalaspidea is distinguished by the presence of a flattened cephalic shield, presumably evolved for burrowing. The shell may be well developed, reduced, internal, or absent. Most are burrowers and nocturnal. Some can swim by flapping their enlarged parapodia. Many, such as Bulla spp., are herbivores but some are carnivores specializing in a variety of taxa including other cephalaspideans. About 13 families are found in Hawaii. The order of the families in the following list doesn't necessarily reflect their relationships.

Acteocinidae

Cylichnidae

Scaphandridae

Retusidae





Mnestiidae

Colinatydidae

Diaphanidae

Philinidae





Colpodaspididae

Gastropteridae

Aglajidae

Haminoeidae





Bullidae



 
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