Achatella achates Billings 1860

Trilobita - Phacopida - Pterygometopidae

Alternative combinations: Dalmanites achates, Pterygometopus achates

Synonym: Pterygometopus billingsi Wilson 1947

Full reference: E. Billings. 1860. Description of some new species of fossils from the Lower and Middle Silurian Rocks of Canada. Canadian Naturalist and Geologist 5:49-69

Belongs to Achatella according to R. E. Swisher et al. 2016

See also Billings 1860, Foerste 1919 and Jaanusson and Ramsk├Âld 1993

Sister taxa: Achatella (Achatella), Achatella katharina, Achatella kuckersianus, Achatella schmidti, Achatella truncatocaudata, Achatella (Vironiaspis) kegelensis


• Ordovician of Canada (5: Ontario, Quebec collections), United States (3: New York, Pennsylvania)

Total: 8 collections each including a single occurrence

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