Description of the larva ofArgia percellulata(Odonata: Coenagrionidae)

Abstract

The larva of Argia percellulata is described and figured. It falls into the group of Argia larvae with a very prominent ligula and one palpal seta, but differs from its closest relatives by having tibiae usually with two well-defined dark rings, posterior margin of sternite 6 smooth, and posterior margin of sternite 7 smooth medially and with spiniform setae laterally. Larvae were found under cobblestones in open, wide, shallow streams where the water flow was slow to moderate, close to the shoreline within a cloud forest. The larva is compared with four other species apparently closely related.