Mayfly Species Anafroptilum conturbatum (Tiny Sulphur Duns)

Abdominal tergites 2-6 of male imago hyaline white; inner margin of second forceps joint distinctly tuberculate; distal joint unusually long.

Turbinate eyes dark blackish brown, in dried specimen. Head and thorax shiny black; pleural sutures brownish. Legs white. Wings hyaline, venation pale (see fig. 165). Abdominal segments 2-6, and part of 7, hyaline white, sometimes with faint dusky shading posteriorly on the middle tergites. Tergites 8-10, and often part of 7, chocolate brown. Sternites white; 2-6 hyaline, 7-9 opaque. Tails white. Second joint of forceps distinctly tuberculate on its inner margin; third joint strongly bowed; distal joint unusually long (see fig. 168). The plate between the bases of the forceps is conical on its posterior margin.