Johansson, N. and Cederberg, B. 2019. 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. 550 (Sep. 2019). DOI:https://doi.org/10.5852/ejt.2019.550.