Labiobaetis sonajuventus n.sp. is described from nymphs collected in a tributary of the Okanogan River in north-central Washington, USA. The new species is distinguished from North American congeners by the well-developed keel between the bases of the antennae, the concave lateral margin of labial palp segment 2, the apically expanded submarginal setae on the labrum, and its western Nearctic di...

Miroculis (Miroculis) eldorado sp. nov. and Ulmeritoides passorum sp. nov. are described based on material from Serra do Tepequém, Roraima State, Brazil. Additional records of Leptophlebiidae genera and species are made. Askola Peters, 1969, Farrodes Peters, 1971, Microphlebia Savage & Peters, 1983, Hydrosmilodon Flowers & Dominguez, 1992, Hagenulopsis minuta Spieth, 1943 and Simothraulopsis de...

The male imago of Americabaetis longetron Lugo-Ortiz & McCafferty is described based on nymphs reared on field in the municipality Alfredo Chaves, Espírito Santo state, Brazil. The species can be distinguished from the others male imagos of the genus by the following combination of characters: 1) turbinate eyes uniformly separated from each other, upper surface ellipsoidal; 2) terga with a ligh...

Persistent organic pollutants (POPs) have been at the forefront of environmental contamination research even before their ban in 2001 Stockholm Convention. Their relation to different compartments environment (biotic and abiotic) has thoroughly investigated. This article aims identify whether benthos could represent a reliable indicator with POPs highlight its potential transfer role between ab...