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Ostrakodermo

Ostrakodermo
Kanbriar-Devoniar
Sailkapen zientifikoa
ErreinuaAnimalia
AzpierreinuaBilateria
FilumaChordata
SubfilumVertebrata
Klasea Ostracodermi
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Azpibanaketa

Ostrakodermo kordatuen filumeko Ostracodermi klaseko arrain fosilez esaten da. Ordoviziarrean eta Devoniarrean bizi izan ziren. Munduan izan diren arrainik antzinakoenak dira, gaur arte aurkitutako fosilen arabera. Burugainean hezurrezko oskol sendo bat zuten; gorputzaren gainerako aldeak ezkata lodiz estaliak zituzten. Gorputza horrela lotua edukitzeak igeri egiteko egokitasun handirik ematen ez zienez, itsas azpian ematen zuten bizitza. Ornodunak ziren, eta ez zuten barailarik.

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