Diademaproetus sp., a trilobite from Morocco, is similar to Cornuproetus in size and shape, but with a few morphological differences. The anterior border of Diademaproetus is elongated forming a 'tongue' or a sub-triangular cephalic process, whereas in Cornuproetus the glabella is rounded. The genal spines are long sometimes reaching the distal part of the pygidium. Both Diademaproetus and Cornuproetus have holochroal eye lenses. It dates from the Devonian.
The trilobite measures 1.25 inches long and 1.0 inches wide. Trilobite and matrix measures 3.1 by 3.0 by 1.35 inches. The lenses in both eyes are well-preserved.
There are no apparent repairs.
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