Ordovician animals

Though less famous than the Cambrian explosion, the Ordovician radiation was no less remarkable; marine faunal genera increased fourfold, resulting in 12% of all known Phanerozoic marine fauna. Another change in the fauna was the strong increase in filter-feeding organisms. The trilobite, brachiopod, archaeocyathid, and eocrinoid faunas of the Cambrian were succeeded by those that dominated the rest of the Paleozoic, such as articulate brachiopods, cephalopods, and crinoids. Articulate brachiopods, in particular, largely replaced trilobites in shelf communities. list of ordovician animals


 * Orthida
 * Orthoceras
 * Crinoid
 * Lituites
 * Belemnitida
 * Agnatha
 * Ostracoderm
 * Cameroceras