Ostracodermi

Từ điển WordNet v3.1 - WordNet Dictionary

noun

extinct group of armored jawless vertebrates;
taxonomy is not clear
• Syn:
order Ostracodermi
• Hypernyms:
animal order
• Member Holonyms:
Agnatha, superclass Agnatha
• Member Meronyms:
ostracoderm, Heterostraci, suborder Heterostraci, Osteostraci, suborder Osteostraci,
Cephalaspida, suborder Cephalaspida