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Taxonomy
Utiidae was named by Kobayashi (1935). It is not extant.
It was assigned to Ptychopariida by Jell and Adrain (2002); and to Trilobita by Adrain (2011).
It was assigned to Ptychopariida by Jell and Adrain (2002); and to Trilobita by Adrain (2011).
Subtaxa