|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Trilobita - Phacopida - Acastidae
It was reranked as Phacops (Acaste) by Salter (1864).
It was assigned to Phacops by Salter (1864); to Phacopida by Sepkoski (2002); and to Acastidae by Jell and Adrain (2003) and Edgecombe (2007).
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.