Flexicalymene Retrorsa- Arnheim Formation Ohio

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Trilobite Species: Flexicalymene Retrorsa

Matrix Formation: Arnheim     450 million years ago.

trilobite itself measures at: 1 x 1/4 matrix.  4 x 2 5/8

Trilobites were an exclusively marine group of arthropods that appeared in the Cambrian Period and persisted throughout the Paleozoic, eventually becoming extinct in the Permian Period. Most were small, bottom-dwelling organisms that fed on organic matter in sediment on the sea bottom. The body is divided in three segments: head (cephalon), middle (thorax), and tail (pygidium). Many species had large, compound eyes.