Artiopoda - Agnostida - Agnostidae
Alternative spelling: Acmarhacis
Synonym: Cyclagnostus Lermontova 1940
Parent taxon: Agnostidae according to C. J. Bentley et al. 2006
See also Jell and Adrain 2002, Palmer 1962, Peng and Robison 2000, Sepkoski 2002, Westrop et al. 1996 and Whittington et al. 1997
Sister taxa: Agnostinae, Agnostus, Aistagnostus, Barrandagnostus, Biciragnostus, Connagnostus, Eurudagnostus, Formosagnostus, Gymnagnostus, Homagnostus, Idolagnostus, Ivshinagnostus, Kormagnostella, Kormagnostus, Kymagnostus, Lotagnostus, Micragnostus, Neoagnostus, Oncagnostus, Oxyagnostus, Peronopsinae, Ptychagnostinae, Quadrahomagnostus, Semagnostus, Strictagnostus, Trilobagnostus
Subtaxa: Acmarhachis acuta Acmarhachis apicula Acmarhachis hybrida Acmarhachis karatauensis Acmarhachis kindlei Acmarhachis longispinus Acmarhachis punctatus Acmarhachis typicalis Acmarhachis whittingtoni
Type: Acmarhachis typicalis
Ecology: slow-moving epifaunal detritivore
Distribution:
• Taoyuanian of the Russian Federation (1 collection), South Korea (8)
• Cambrian to Ordovician of France (1)
• Cambrian of Antarctica (5), Australia (2), Canada (18: Newfoundland and Labrador, Yukon), China (14), Kazakhstan (13), United States (5: Nevada, Utah, Virginia)
Total: 67 collections including 79 occurrences
Specimen images are retrieved through the ePANDDA API.
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