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Pharostomatidae
Taxonomy
Pharostomatidae was named by Hupé (1953). It is not extant.
It was assigned to Phacopida by Jell and Adrain (2002); and to Calymenina by Adrain (2011).
It was assigned to Phacopida by Jell and Adrain (2002); and to Calymenina by Adrain (2011).