Family Oreogetonidae

Head variously shaped, often with large eyes and elongated proboscis, antennae with 3 or fewer segments and usually a stylus or arista (absent in Allanthalia), antennae with indistinctly 4-segmented arista-like stylus

Thorax with bristes mostly limited to notopleural and scutellar areas, laterotergite with a group of setae

Legs various, sometimes modified, in females sometimes with flattened setae, basal segments of some tarsi in some males, tibiae never with true apical spur, but fixed spur may be present, empodia usually setiform, pulvilliform only in Clinocerinae, pulvilli usually present, mid coxal prong absent

Wings present or reduced, with rounded apex and radiating wing venation, veins at least in posterior half not setose, distinct bristle present at the base of C, C extending around wing, Sc joining C, Rs originating well distal to level of crossvein h, crossvein r-m distal to basal fourth of wing, CuA2 recurved and confluent with underside of cell cup, cell cup never attaining wing margin, rarely with vein A1 reaching wing margin, but if so, Sc incomplete or cell cup obtuse or rounded at apex, Anal lobe usually well-developed, alular sinus angular, and small alula usually present

Abdomen more or less elongate but sometimes short