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DIKELOKEPHALINA Brogger, 1896. Dikelokephalina sp., L. Ordovician, Anti-Atlas Range, Morocco (x0.7). A large trilobite (seemingly undescribed) that is extracted in copious assemblages of complete individuals, often repaired with arbitrary contours. This particular example is for the most part pristine, and the pygidium exhibits the characters of the genus without ambiguity. (Photographed by the author through courtesy of David C. Rilling., RLS id.)

Family Trinucleidae Hawle and Corda, 1847

Subfamily Trinucleinae Hawle and Corda, 1847

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