This is a nice specimen of Calymene niagarensis. This Silurian trilobite is from the Rochester Shale of New York. The ancient arthropod is wonderfully prone and well displayed. The bug is very 3-dimensional and exhibits fine detail - both free cheeks are present. The trilobite has great color and contrast and is well showcased on the rounded matrix plate. This is a nice, distinct specimen of Calymene niagarensis.