Ostracoderms (“Shell Skins”)
Jawless fish, generally less than a foot long, that were covered with small bony plates.
Had small mouths—probably used pharyngeal muscles to suck in slow-moving food.
Had fairly rigid fins and a cartilaginous skeleton.
Went extinct shortly after the end of the Devonian.
Images courtesy of Stanton Fink.
Artist’s reconstructions of ostracoderms. On the left, species of Cephalaspis.
On the right, species of Galeaspida.