Trilobites were among the most successful of all early animals.  The first fossil records are from the Early Cambrian period 521 million years ago, and they existed for over 270 million years before they became extinct.  Over 22,000 species have been described, from Acanthopleurella stipulae, the smallest at 1 mm, to Isotelus, the largest at 70 cm long..  

ERS10514
Finish: Solid brass, electro-plated with non-tarnishing silver finish, ear wires are hypo-allergenic
Dimensions: Hangs approx. 1" (Gift Boxed with Provenance Card)