different between devonian vs placoderm

Romanian

From French dévonien

devonian m or n (feminine singular devonian?, masculine plural devonieni, feminine and neuter plural devoniene)

devonian f

From placo- +? -derm, after German Placoderm.

placoderm (plural placoderms)

(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. [from 19th c.]

placoderm (comparative more placoderm, superlative most placoderm)

(paleontology) Pertaining to the class Placodermi. [from 19th c.]
- 2018, Elsa Panciroli, The Guardian, 24 January:
  Research published recently on placoderm fish fossils from Scottish Devonian lakes (around 365 myo) found evidence for how this extinct group of animals copulated.

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