The larva of Zenithoptera lanei Santos, 1941 is described and illustrated based on three exuviae of reared larvae collected in Misiones, Argentina, Roraima and Amazonas, Brazil. A comparison with the larva of Z. anceps Pujol-Luz, 1993 is included.

The dragonfly fauna of four reserves located in Campos y Malezales ecoregion, Misiones Province, was studied between 2014 and 2018. Thirty-six species and eight morphotypes, belonging to six families of Anisoptera and Zygoptera were identified, representing together 22% of the known species in the Province. Libellulidae was the family with the highest number of species recorded (22 species) followed by Coenagrionidae (15 species). Two species were new records, one for Argentina (Minagrion waltheri Selys), and one for Misiones province (Tholymis citrina Hagen)

The larva of Peristicta aeneoviridis Calvert, 1909 is described for the first time, based on material from Misiones Province, Argentina. It differs from the rest of the larvae described for the genus in the shape and coloration of caudal lamellae, femur setae, lacinia teeth and coloration patterns. Additions to the description of the larva of P. forceps Hagen in Selys, 1860 are included.