Redescription of Chaetocladius glacialis (Lundström, 1915) comb nov.

The damaged male holotype of Hydrobaenus glacialis Lundstrom, 1915 is redescribed and transferred to the genus Chaetocladius Kieffer. The male imago is readily distinguished by the reduced antenna with 10–11 flagellomeres and by hypopygial features. The similarities with the H. lugubris group in all likelihood are due to common adaptations to ground mating.