Drepanosticta siebersi

Male: A medium-sized damselfly with a predominantly black body and pale markings. This species can be distinguished by the horn-like posterior lobe of the prothorax that curves outwards. Synthorax is black with a narrow, pale blue lateral patch along the anterior edge of the posterior suture. The abdomen is black, featuring white dorsal rings on segments 2–7. Segment 10 is very short and segment 9 is three times as long as segment 10. Its anal appendages are dirty white. The superior appendages are ribbon-like and twisted like a corkscrew. The inferior appendages are equal in length, conical, and thick at the base, tapering rapidly to a blunt point that turns inward with the tips nearly meeting. Female: The female's color and pattern are identical to those of the male. The posterior lobe of the prothorax is smaller than in the male, bearing shorter horns that form mere conical protuberances. Abdominal segments 8, 9, and 10 become progressively shorter towards the apex. Segment 10 and the anal appendages are pale brown, with the appendages being very small and conical in shape.