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Taxonomy
Acastella was named by Reed (1925) [Sepkoski's age data: S Ludl-l D Sieg-l].
It was reranked as Phacops (Acastella) by Reed (1925); it was reranked as Acaste (Acastella) by Richter and Richter (1954).
It was assigned to Phacops by Reed (1925); to Acaste by Richter and Richter (1954); to Acastidae by Jell and Adrain (2002); and to Phacopida by Sepkoski (2002).
It was reranked as Phacops (Acastella) by Reed (1925); it was reranked as Acaste (Acastella) by Richter and Richter (1954).
It was assigned to Phacops by Reed (1925); to Acaste by Richter and Richter (1954); to Acastidae by Jell and Adrain (2002); and to Phacopida by Sepkoski (2002).
Species
Species lacking formal opinion data