chiracanthus

from The Century Dictionary.

• noun A genus of fossil ganoid fishes of the Devonian or Old Red Sandstone formation, covered with small brightly enameled scales, and having all its fins armed with defensive spines. It abounds at Gamrie, in Banffshire, Scotland, and other localities in Great Britain.
• noun A genus of nematoid worms or threadworms, entirely covered with spines. C. hispidum is an example. Also Cheiracanthus.