A new fungal species, Furculomyces septentrionalis, was found living in the
hindgut of Chironomidae larvae in the Rocky Mountains of Colorado, USA. Th
e two previously known species of the genus inhabit the hindguts of Austral
ian Chironomidae larvae, thus leading to an unexpected disjunct distributio
n for the genus. The new fungus is the second species of Furculomyces to be
cultured axenically.