Placodermi, usa na extinct na class han mga prehistoric na isda na nabuhi sadton Silurian tubtob sa katapusan san Devonian Period.
An una na masusugad na placoderm ginuwa sa fossil record sadton kaurhian san Llandovery epoch sa Silurian.[1] An magkadurudilain na mga grupo san placoderm nagdaramo sadton Devonian, pero nagin extinct sa katapusan san Devonian Hangenberg event 360 milyones katuig an nakalabay[2]
Mga biolohikal na order han Placodermi
Antiarchi †
Arthrodira †
Brindabellaspida †
Petalichthyida †
Phyllolepida †
Ptyctodontida †
Rhenanida †
Acanthothoraci †
?Pseudopetalichthyida †
?Stensioellida †
Mga kasarigan
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