Spiny Leonapsis Trilobite
Matrix size: 3.5" x 4.25" x 3" approx.
Specimen size: 2" x 1.5" approx.
Trilobite, any member of a group of extinct fossil arthropods easily recognized by their distinctive three-lobed, three-segmented form. Trilobites, exclusively marine animals, first appeared at the beginning of the Cambrian Period, about 542 million years ago, when they dominated the seas.