Skrjabingyliasis among mustelids has frequently been inferred from sinus lesions without actual recovery of the suspect nematode. In the present work on mink, otter, fisher, marten and weasels collected from various regions in Ontario, Quebec and Newfoundland, prevalence and intensity of Skrjabingylus spp. infections were assessed through subjective scorings for sinus discoloration, swelling, bone thinning and perforations and later confirmed by extracting and counting parasitic worms present. While lesion scores generally proved to be reliable predictors of infection, even among...