3.5" Asaphus Intermedius Trilobite With Exposed Hypostome

This is a large example of the stalked eyed trilobite Asaphus intermedius from the St. Petersburg region of Russia. This is one of the more uncommon Asaphus species from the area and at 3.5" long this specimen is quite large. Type hypostome (mouthplate) was been exposed on the underside of the head. There is a patch of shell restoration on the left hand side of the tail, and then some small gap fills between shell fractures on the right side.

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.
Asaphus intermedius
Vilpovitsy quarry, St. Petersburg region, Russia
Asery level
3.5" long
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