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Plakodermo

Plakodermo
430 Ma-360 MaSiluriar goiztiar – Devoniar berantiar
Sailkapen zientifikoa
ErreinuaAnimalia
AzpierreinuaBilateria
FilumaChordata
SubfilumVertebrata
Klasea Placodermi
McCoy, 1848

Plakodermoak (Placodermi, antzinako grezieraz: πλάξ, xafla eta δέρμα, azala) iraungitako klase bateko arrainak dira. Lehenbiziko gnatostomatuak, hots, lehenbiziko ornodun barailadunak izan ziren. Devoniarrean bizi izan ziren, orain 395-345 miloi urte. Klase honetako bi arrain-espeziek bakarrik iraun zuten Karboniferora arte. Burua hezurrezko xafla sendoz babestua zuten. Gorputzaren gainerako aldeetan ezkatarik ere ez zuten. 3,5 m luze baziren arren, neurri txikikoak, 6-40 cm bitartekoak ziren gehienak.

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