suborder Heterostraci su·bor·der·heterostraci uncommon noun 1. extinct group of armored jawless fishes or fishlike vertebrate; taxonomy is not clear SynonymsHeterostracisuborder Heterostraci Related words Broader terms animal order Parts Ostracodermi Part of heterostracan WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
