Pristicola bruchi is a new species of trematode parasite that was recently discovered in lake sturgeon (Acipenser fulvescens) in Wisconsin. The intermediate hosts are not known yet, but based on related taxa and the food web in this ecosystem, oligochaetes are likely candidates. The discovery of this species now begins to shed light on the biogeography of sturgeon parasites. There are now three genera that each have two representative species - one in Eurasia and one in North America, suggesting a very ancient vicariant event, perhaps as old as the Cretaceous.
Image is from the original species description, published in 2009.