Its species lived from 501 to 490 million years ago during the Dresbachian faunal stage of the late Cambrian Period .
Tricrepicephalus is an extinct genus of ptychopariid trilobites of the family Tricrepicephalidae with species of average size .
Tricrepicephalus ' species lived from 501 to 490 million years ago during the Dresbachian faunal stage of the late Cambrian Period .
Tricrepicephalus is an extinct genus of ptychopariid trilobites of the family Tricrepicephalidae with species of average size .