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Acmarhachis
Taxonomy
Acmarhachis was named by Resser (1938) [Sepkoski's age data: ].
It was assigned to Pseudagnostidae by Westrop et al. (1996); to Agnostidae by Whittington et al. (1997), Jell and Adrain (2002); and to Agnostida by Sepkoski (2002).
It was assigned to Pseudagnostidae by Westrop et al. (1996); to Agnostidae by Whittington et al. (1997), Jell and Adrain (2002); and to Agnostida by Sepkoski (2002).