Elrathia
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Elrathia is a genus of trilobite belonging to Ptychopariacea known from the mid-Cambrian of Laurentia. Wikipedia
Class: †Trilobita
Genus: †Elrathia; Walcott, 1924
Kingdom: Animalia
Order: †Ptychopariida
Phylum: Arthropoda
Family: †Alokistocaridae