Johansson, Niklas, and Björn Cederberg. “Review of the Swedish Species of Ophion (Hymenoptera: Ichneumonidae: Ophioninae), With the Description of 18 New Species and an Illustrated Key to Swedish Species”. European Journal of Taxonomy, no. 550 (September 12, 2019). Accessed April 25, 2026. https://ejt.sandbox.publicknowledgeproject.org/index.php/ejt/article/view/749.