With the broad and long genal spines this has a superficial resemblance to a Harpide trilobite, but it is actually in the same family as Elrathia kingi.
In their Trilobite Gallery the American Museum of Natural History calls this species Amecephalus althea, apparently deciding that A. althea and A. laticaudum are the same species and so using the senior name. But most trilobite experts still consider the species to be distinct.
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