Heterostraci

Từ điển WordNet v3.1 - WordNet Dictionary

noun

extinct group of armored jawless fishes or fish-like vertebrate;
taxonomy is not clear
• Syn:
suborder Heterostraci
• Hypernyms:
animal order
• Member Holonyms:
Ostracodermi, order Ostracodermi
• Member Meronyms:
heterostracan