The Pterygometopinae may be exclusive to
Baltica and are known from the Floian to the Upper Katian with 49 species in 14 genera. The 71 species from 8 genera belonging to 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 to
Avalonia and Laurentia in the Katian, at the end of which they became extinct. 32 species of Monorachinae in 6 genera occurred on the
paleocontinent Siberia, now parts of northeastern Russia and of Alaska, from the Sandbian to the Upper Katian. == Genera ==