CrepicephalusCrepicephalus is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived from 501 to 490 million years ago during the Dresbachian faunal stage of the late Cambrian Period.Reassigned speciesSome species, previously described as Crepicephalus have since been moved to other genera.C. angusta = Kochaspis angustaC. convexus = Crepicephalina convexaC. liliana = Kochaspis lilianaC. nitidus = Dunderbergia nitidaC. quadrans = Ehmaniella quadransC. unca = ''Uncaspis unca''