Word
Osteostraci, n.
extinct group of armored fish-like vertebrates; taxonomy is not clear
<noun.animal>
Cephalaspida
Osteostraci
suborder Cephalaspida
suborder Osteostraci
semantic pointers
hypernym
animal order
member holonym
Ostracodermi, order Ostracodermi
member meronym
osteostracan, cephalaspid