Three new species of the genus Ceylonosticta Fraser, 1931 (Odonata: Zygoptera: Platystictidae) from Sri Lanka and the rediscovery of Ceylonosticta subtropica (Fraser, 1933)

Three new species of Ceylonosticta are described and illustrated: Ceylonosticta nancyae sp. nov., Ceylonosticta rupasinghe sp. nov. and Ceylonosticta alwisi sp. nov. from Samanala Nature Reserve (Adam’s Peak), Kuruwita-Erathna footpath, Ratnapura District, Sri Lanka. Ceylonosticta subtropica has been recorded for the first time after 83 years and the first depiction of its genital ligula is…

Description of the larva of Argia jujuya Ris (Coenagrionidae) with a key to species from the Argentinean Yungas cloud forest

The previously unknown larva of Argia jujuya Ris, 1913 is described, diagnosed and illustrated. Among other characters, the following combination is important to distinguish it from other species in the genus: antennae with six concolorous segments, ligula projected only slightly, row of small premental setae present, abdominal sternum 8 almost entirely covered with spiniform setae,…

Generic revision of Argiolestidae (Odonata), with four new genera

The subfamily Argiolestinae is raised to family level to include all zygopteran genera in which the gills of the larvae are flat and held in a horizontal plane. A diagnosis of the family is given and characters for both adults and larvae are presented. The family is divided into two subfamilies based on characters in…

Two new species of Metaleptobasis from Central Ecuador (Odonata: Coenagrionidae)

Two new species of Metaleptobasis from Ecuador are described and illustrated. Metaleptobasis gibbosa (holotype ♂, allotype \female: Ecuador, Pastaza Province, forest wetlands, Los Copales, between Mera and Shell, 01° 29′ 30′′ S, 078° 04′ 19′′ W, elevation 1070 m, 20–22 September 2005, leg. K. J. Tennessen; deposited in Florida State Collection of Arthropods) appears related…

Description of the larva of Argia percellulata (Odonata: Coenagrionidae)

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…