(N) :
(from , 'trench' and 'scale') a widespread, abundant and diverse genus of antiarch placoderms that lived during the Middle to Late Devonian period of the Paleozoic Era.
(N) :
(from , 'trench' and 'scale') a widespread, abundant and diverse genus of antiarch placoderms that lived during the Middle to Late Devonian period of the Paleozoic Era.