Home Acknowledgments Conventions Glossary Maps References Links Articles Thumbnails Species list Next order	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. At least nine families are found in Hawaii. Cylichnidae Retusidae Diaphanidae Philinidae Gastropteridae Aglajidae Haminoeidae Runcinidae Bullidae
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