Endoceras (Ancient Greek for "inner horn") is an extinct genus of large, straight shelled cephalopods that gives its name to the Nautiloid order Endocerida. The genus lived during the middle and upper Ordovician 485 to 419 million years ago.
Endoceras (Ancient Greek for "inner horn") is an extinct genus of large, straight-shelled cephalopods that gives its name to the Nautiloid order Endocerida. The genus existed during the middle and upper Ordovician period 485 to 419 million years ago.