Acmarhachis

Acmarhachis; Temporal range: Upper Cambrian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Trilobita
Order:	Agnostida
Suborder:	Agnostoidea
Family:	Agnostidae
Subfamily:	incertae subfamiliae
Genus:	Acmarhachis; Resser, 1938
Species
	A. typicalis Resser, 1938 (type); A. acuta (Kobayashi, 1938); A. anhuiensis (Qiu, 1983) synonym Wanagnostus anhuiensis; A. apicula Öpik, 1967 synonym Oxyagnostus apicula; A. elegans (Lermontova, 1940) synonym Cyclagnostus elegans Lerm., 1940; A. karatauensis Ergaliev, 1980; A. longispinus Ergaliev, 1980; A. punctatus Ergaliev, 1980; A. whittingtoni Westrop & Eoff, 2012;
Synonyms
	Cyclagnostus, Wanagnostus

Acmarhachis is a genus of trilobite in the order Agnostida, which lived in what are now Australia (Queensland, Tasmania), Canada (British Columbia, Newfoundland, Northwest Territories), China (Anhui), Kazakhstan, Russia (Kharaulakh), and the US (Alaska, Alabama, Nevada, Maryland, Vermont). It was described by Resser in 1938, and the type species is Acmarhachis typicalis.^[3]

^ Arthropoda - Klass trilobity (Class Trilobita). EV Lermontova, Atlas of the Leading Forms of the Fossil Faunas of the USSR, 1940
^ Whittington, H. B. et al. Part O, Treatise on Invertebrate Paleontology. Revised, Volume 1 – Trilobita – Introduction, Order Agnostida, Order Redlichiida. 1997
^ Available Generic Names for Trilobites P.A. Jell and J.M. Adrain.

[1] Arthropoda - Klass trilobity (Class Trilobita). EV Lermontova, Atlas of the Leading Forms of the Fossil Faunas of the USSR, 1940

[Treatise-2] Whittington, H. B. et al. Part O, Treatise on Invertebrate Paleontology. Revised, Volume 1 – Trilobita – Introduction, Order Agnostida, Order Redlichiida. 1997

[3] Available Generic Names for Trilobites P.A. Jell and J.M. Adrain.

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