Dysplanus acutigenia Russian Trilobite

Dysplanus acutigenia

Trilobite Order Corynexochida, Superfamily Illaenoidea, Family Illaenidae

Geological Time: Lower Ordovician, Asery Horizon

Size: 45 mm

Fossil Site: Wolchow River Region, St Petersburg, Russia

Russian Trilobite Dysplanus acutigeniaDescription: Coming from the Middle Ordovician Asery Level deposits of the Wolchow River region near Saint Petersburg, Russia, this is an example of a 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 preserved well centered. This is a taxon is only very rarely seen. As always, the skillful Russian preparators have shown this fine 3-D specimen to best advantage.

Also see: Russian Trilobites Gallery

click to enlarge


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