This Specimen has been sold.
1.55" Asaphus Latus with Partial Kowalewskii Trilobite - Russia
This is a cool association of a 1.55" long Asaphus latus next to a partial, stalk-eyed Asaphus Kowalewskii trilobite. Both of the trilobites have some areas of shell restoration.
Trilobites were a very diverse group of extinct marine arthropods. They first appeared in the fossil record in the Early Cambrian (521 million years ago) and went extinct during the Permian mass extinction (250 million years ago). They were one of the most successful of the early animals on our planet with over 25k described species, filling nearly every evolutionary niche. Due in large part to a hard exoskeleton (shell), they left a excellent fossil record.