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Considered the earliest vertebrate with jaws
Answer for the clue "Considered the earliest vertebrate with jaws ", 9 letters:
placoderm
Alternative clues for the word placoderm
Word definitions for placoderm in dictionaries
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Placoderm \Plac"o*derm\, n. [Gr. pla`x, plako`s, tablet + de`rma skin.] (Paleon.) One of the Placodermi.
WordNet
Word definitions in WordNet
n. fishlike vertebrate with bony plates on head and upper body; dominant in seas and rivers during the Devonian; considered the earliest vertebrate with jaws
Wiktionary
Word definitions in Wiktionary
n. A member of an extinct group of fish with armored heads; the group lived during the Silurian and Devonian periods.
Usage examples of placoderm.
Five hundred million years ago, swimming in the primeval seas, there were fishy creatures called ostracoderms and placoderms, whose brains had recognizably the same major divisions as ours.
This was my first word of the discovery, and it told of the identification of early shells, bones of ganoids and placoderms, remnants of labyrinthodonts and thecodonts, great mosasaur skull fragments, dinosaur vertebrae and armor plates, pterodactyl teeth and wing bones, Archaeopteryx debris, Miocene sharks’ teeth, primitive bird skulls, and other bones of archaic mammals such as palaeotheres, Xiphodons, Eohippi, Oreodons, and titanotheres.
This was my first word of the discovery, and it told of the identification of early shells, bones of ganoids and placoderms, remnants of labyrinthodonts and thecodonts, great mosasaur skull fragments, dinosaur vertebrae and armor plates, pterodactyl teeth and wing bones, Archaeopteryx debris, Miocene sharks' teeth, primitive bird skulls, and other bones of archaic mammals such as palaeotheres, Xiphodons, Eohippi, Oreodons, and titanotheres.