Idiocnemis bidentata

A medium-sized dark-colored damselfly with brown to black body coloration and distinct purple or bluish markings. Head characterized by a large subquadrangular black marking surrounding the ocelli and extending toward the eye margins, forming one of the most recognizable external features of the species. Thorax with complete antehumeral stripes, approximately half as wide as the black carinal stripe, and lacking pruinescence on the prothorax, synthorax, and anterior abdomen. Wings hyaline with dark pterostigma, while the abdomen is slender and predominantly blackish-brown with faint purple markings on posterior segments. The species is especially distinguished by the male anal appendages: the superior appendage bears a distinct subtriangular basal projection and a uniquely notched distal process, which represents the primary diagnostic character of the species. This combination of a large ocellar marking, complete antehumeral stripes, absence of pruinescence, and the characteristic notched superior appendages clearly separates Idiocnemis bidentata from other members of the genus.