placoderm

IPA: pɫˈeɪkʌdɝm

(paleontology) A member of an extinct class (Placodermi) of jawed fish with armored heads and thoraces; the group lived during the Silurian and Devonian periods.

Examples of "placoderm" in Sentences

Placoderms were a group of ancient armored fish that lived during the Devonian period
The placoderm fossils found in Australia provide important insights into early vertebrate evolution
Scientists believe that placoderms were the first jawed vertebrates to evolve
The size and shape of placoderm armor varied greatly among different species
Placoderms went extinct around 358 million years ago, leaving behind a rich fossil record for researchers to study