Coming from the Middle Ordovician Asery Level deposits of the Wolchow River region near Saint Petersburg, Russia, this is an example of an extremly rare trilobite of the genus Dysplanus. It is obviously related to Illaenus, having a similar high profile of the cephalon, presumably a feature that allowed it to plow the substrate looking for a meal. One of the most obvious differences is that Dysplanus has NINE thoracic segments rather than the TEN of Illaenus.
Its dark caramel-colored Calcite shell is well set off by the white limestone matrix, with the trilobite well preserved. This is a taxon is only very rarely seen, and typically sells for a much higher price.