Ceratodus latissimus (Greek for "horned tooth") was a wide-ranging genus of extinct sarcopterygiian lungfish from the middle Triassic era to the late Cretaceous era.. Colour printed illustration by Heinrich Harder from "Tiere der Urwelt" Animals of the Prehistoric World, 1916, Hamburg. Heinrich Harder (1858-1935) was a German landscape artist and book illustrator. From a series of prehistoric creature cards published by the Reichardt Cocoa company. Natural historian Wilhelm Bolsche wrote the descriptive text.