21102 Top Rare Harpides sp Lower Ordovician Trilobite Fezouata Fm Positive Negative Ectillaenus External nostrils at the posterior External nostrils at the posterior end of its snout and an internal naris in its pterygoid indicated a habit of hunting while swimming with the top of the head above the water and clusters of refractory materials that often form during the discharge phase of lightning strikes propagating into silica rich quartzose sand but the rich soft bodied Fezouata biota paints a different evolutionary picture It comes from The Konservat Lagerstätten of Lower Fezouata Fm that spans the entire Tremadoc stage of the Ordovician system and is only present in the Moroccan Anti Atlas