heterostraci

English Thesaurus

1. extinct group of armored jawless fishes or fish-like vertebrate; taxonomy is not clear (noun.animal)

hypernym	:	animal order,
definition	:	the order of animals (noun.animal)

member holonym	:	heterostracan,
definition	:	extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian (noun.animal)

member meronym	:	order ostracodermi, ostracodermi,
definition	:	extinct group of armored jawless vertebrates; taxonomy is not clear (noun.animal)