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
Calliops armatus cephalon dorsal CRF
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.
Pterygometopidae
…the Eomonorachinae occur mostly in Laurentia from the Floian. One genus, Podowrinella, is known from the Silurian, and may be the sister taxon of the Phacopidae. 50 species in 8 genera have been assigned to the Chasmopinae. They are exclusive to Baltica from the Darriwilian to the Sandbian. The subfamily spread…
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