Meaning of CEPHALASPIDA

WordNet Dictionary
	Definition:		[n]  extinct group of armored fishlike vertebrates; taxonomy is not clear
	Websites:
	Synonyms:		Osteostraci, suborder Cephalaspida, suborder Osteostraci
	See Also:		animal order, cephalaspid, order Ostracodermi, osteostracan, Ostracodermi