Among the onchocercids of cervids, Onchocerca alcis n. sp., a parasite of the moose, Alces alces, belongs to that small palearctic group of evolved onchocercids consisting of O. jakutensis, O. garmsi and O. tarsicola. It is distinguished from its most closely related species, O. jakutensis, primarily on the characters of the lateral chord and cuticle, its greater spicule ratio, and the characteristic shapes of the anterior and posterior extremities of female worms.