Trilobite Calymene, with matrix. Size is just under 7cm. There are no repairs or missing parts, and the details are clear. Weight: 99g. Calymene (カリメネ) is famous as one of the main types of trilobites, primarily from the Silurian period, and belongs to Calymenidae within Calymenina of Phacopida. The main production areas are the United States, the United Kingdom, and Morocco.