Artiopoda - Agnostida - Agnostidae
Alternative spelling: Acmarhacis
Synonym: Cyclagnostus Lermontova 1940
Parent taxon: Agnostidae according to H. B. Whittington et al. 1997
See also Jell and Adrain 2002, Peng and Robison 2000, Sepkoski 2002 and Westrop et al. 1996
Sister taxa: Agnostinae, Agnostus, Aistagnostus, Barrandagnostus, Biciragnostus, Connagnostus, Eurudagnostus, Formosagnostus, Gymnagnostus, Hadragnostus, 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
Ecology: slow-moving epifaunal detritivore
Distribution:
• Tremadoc of France (1 collection)
• Cambrian of Australia (2), Canada (18: Newfoundland and Labrador, Yukon), China (14), Kazakhstan (13), United States (5: Nevada, Utah, Virginia)
• Taoyuanian of the Russian Federation (1), South Korea (8)
Total: 62 collections including 74 occurrences
Specimen images are retrieved through the ePANDDA API.
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