Fibromermis roarki n. gen., n. sp. (Nematoda: Mermithidae) is described from the hemocoel of chironomid imagos of Ablabesmyia monilis (L.) eclosing from the headwaters of the Mississippi River at Gulsvig Landing in northern Minnesota in the summer of 2007. The new genus is described, distinguished from the most closely related tetrapapillate aquatic mermithid genus, and the new species described. Intensity and sex specificity of infection are recorded from 28 host adult chironomids of a single cohort. The new species represents the fourth tetrapapillate mermithid species described from the area and the third tetrapapillate genus.

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