Phacopidae
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Phacopidae is a family of phacopid trilobites that ranges from the Lower Ordovician to the Upper Devonian, with representatives in all paleocontinents.
Drotops armatus, Middle Devonian, Bou D Ob Formation, Jbel Issoumour & Jbel Mrakib, Ma Oder Region, Morocco Houston Museum of Natural Science DSC01634
Schizochroal eye of Elredgeops rana
Ductina vietnamica, a phacopid that lacks eyes
Pterygometopidae
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The Pterygometopidae are a family of trilobites, that is known from the Floian to the Katian, and reappears from the Telychian to the Sheinwoodian. As part of the Phacopina suborder, its members have
Phacopidae
…well developed, they were evidently nonfunctional in ecdysis, since no separate free cheeks can be found. The Phacopinae likely have evolved from the Pterygometopidae, and the presumed sister taxon is Podowrinella. The earliest species and the only one known from the Ordovician (upper Katian) is Sambremeusaspis…
Calliops armatus cephalon dorsal CRF