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cephalaspidea
The clade Cephalaspidea, also known as the headshield slugs and bubble snails, is a taxon of sea slugs and bubble snails, marine gastropod mollusks within the larger clade Euopisthobranchia.〔Jörger K. M., Stöger I., Kano Y., Fukuda H., Knebelsberger T. & Schrödl M. (2010). "On the origin of Acochlidia and other enigmatic euthyneuran gastropods, with implications for the systematics of Heterobranchia". ''BMC Evolutionary Biology'' 10: 323. .〕 Bubble shells is another common name for these families of marine gastropods, some of which have thin bubble-like shells.〔Dance S. P. (1996). ''Shells. The visual guide to over 500 species of seashell from around the world''. Dorling Kindersley. London, New York, Stuttgart.256 pp. pages 200-203. ISBN 0-86318-811-7.〕
Members of this worldwide clade appear to be the most primitive of the opisthobranchs.
Headshield slugs are the most morphologically diverse group of all the opisthobranchs.
==Anatomy==
The vast majority possess a shell, although it may be reduced or internal. They have a well-developed headshield, a characteristic broadening at the head, which is used to plow beneath the surface of the sand. This headshield prevents the sand entering the mantle cavity. There is a muscular foot with or without parapodia (fleshy wing-like flaps).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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