Definition of "eleutherozoic"

These Pelmatozoa in a way are to be regarded as intermediate between the statozoic and eleutherozoic forms, as regards their mode of life, and may be dealt with to advantage in the present paper.

1912, Proceedings of the United States National Museum

They considered articulates to be pre-adapted for an eleutherozoic existence because they possess muscular arms which are potentially of value in crawling and swimming, as in comatulids.

1977, Bulletin of the British Museum (Natural History)