Asaphus broggeri

Trilobites Order Asaphida Suborder Asaphina, Superfamily Asaphoidea, Family Asaphidae
Geologic Age: Lower Ordovician
Trilobite is 115 mm long
Wolchov Horozon deposits of the Wolchow River region near Saint Petersburg, Russia
Remarks: The area where these Russian trilobites lived in the Ordovician experienced dramatic changes in salinity and turbidity, exerting significant selective pressure. The fossil record shows rapid adaptation in some Asaphidae that evolved eyes on high stalks, allowing them to better see both predator and prey more easily. Asaphus broggeri was basal to this evolutionary innovations, giving rise to many species along several lines of descent. Note the significant effacement of the entire exoskeleton.

Also see: Russian Trilobites Evolution in Russian Ordovician Asaphids








Asaphus broggeri Asaphid Trilobite from Lower Ordovician of Russia