Trilobita
Subspecies

Pseudosphaerexochus (Pseudosphaerexochus) ravni Olin, 1906

Selection of related publications
Kielan-Jaworowska, Z., Bergström, J. Ahlberg, P. 1991. Cheirurina (trilobita) from the Upper Ordovician of Västergötland and other regions of Sweden. GFF 113, 2-3, 219-244. DOI:10.1080/11035899109453857
Classification
References based on distribution