New species and new records of Belostoma Latreille, 1807 (Insecta: Hemiptera: Belostomatidae) from northeastern Brazil.

Belostoma zecai Stefanello sp. nov. (Insecta: Hemiptera: Belostomatidae) is described and illustrated based on specimens from the Nascentes do Rio Parnaíba National Park, a protected area in the state of Maranhão, northeastern Brazil.

Efficiency in using genera and families of heteroptera for stream biomonitoring in the Cerrado Biome, Eastern Maranhão, Brazil.

Heteroptera are aquatic insects sensitive to environmental impacts that are frequently used in biomonitoring programs. Resolving families and genera provides consistent responses and can be a useful alternative to accelerate monitoring results and simplify protocols. Our objective was to evaluate which taxonomic levels may be more effective in assessing environmental impacts by testing the following hypotheses: (i) higher taxa of Heteroptera (family and genus) will present congruence with lower taxa (species); (ii) the environmental integrity of the stream will affect the composition of the family, genera and species and will create change points in the abundance and frequency of each taxon.

Discovering the diversity of tadpoles in the mid-north Brazil: morphological and molecular identification, and characterization of the habitat.

Brazil stands out for presenting the highest amphibian anuran diversity in the world. However, taxonomic studies that address characteristic of larval stage of anurans are incipient, representing only 62% of known species. We assess the species diversity of tadpoles from eastern Maranhão state, mid-northern region of Brazil based on morphological and molecular identification (.

After a decade, a new Venezuelan species of Latreille (Megaloptera, Corydalidae, Corydalinae) is discovered.

A new species of dobsonfly from Venezuela, Martins, Azevêdo, Hamada & Contreras, , was discovered a decade after the last description of a species of this genus in the country. The new species is morphologically similar to Contreras-Ramos & von der Dunk, sharing a uniform reddish coloration of body and wings and similar male genitalic structures. Likewise, it shares this particular coloration with Contreras-Ramos but the genitalic structure fits within the Contreras-Ramos species group.

Environmental thresholds of dragonflies and damselflies from a Cerrado-Caatinga ecotone.

Aquatic ecosystems are affected by different land uses that modify gradients of environmental conditions. These impacts act directly on the community structure, especially the most sensitive ones, such as aquatic insects. Thus, dragonflies have been used as good models to assess these changes, since their suborders Anisoptera and Zygoptera have different ecophysiological and behavioral requirements.

New species and stages description of Traverella Edmunds, 1948 (Ephemeroptera: Leptophlebiidae) from Northeast Brazil.

The genus Traverella Edmunds, 1948 (Ephemeroptera: Leptophlebiidae) has 15 described species, three of them recorded from Brazil: Traverella bradleyi (Needham Murphy, 1924), T. insolita Nascimento Salles, 2013 and T. maranhensis Nascimento, Lima Azevedo, 2019.

The genus Anacroneuria Klapálek, 1909 (Plecoptera: Perlidae) from Maranhão State, northeastern Brazil.

Based on collections made from streams of the Itapecuru, Parnaíba and Tocantins River basins, three species of Anacroneuria Klapálek are recorded for the first time from Maranhão State, northeastern Brazil: A. atrifrons Klapálek, A. minuta Klapálek and A.

The nymph of Hermanellopsis arsia Savage amp; Peters, 1983 (Ephemeroptera: Leptophlebiidae) from Brazilian Northeastern Region.

Hermanellopsis Demoulin, 1955 is a genus of Leptophlebiidae known from adults of both sexes and is represented solely by two species, both from South America: Hermanellopsis arsia Savage Peters, 1983, described only from male subimago; and H. incertans (Spieth, 1943) described from male imago and female subimago. Edmunds et al.

A new species of Traverella Edmunds, 1948 (Ephemeroptera: Leptophlebiidae) from Brazil.

A new species of Traverella Edmunds (Ephemeroptera: Leptophlebiidae) is described based on male imagoes from the state of Maranhão, northeastern Brazil. The main characteristics that distinguish the new species from the other species are: 1) subgenital plate forming two lateral, broad projections with two fine, long spines dorsally recurved; 2) penis lobe triangular and apically rounded, with a small ventral projection at apex and a ventral longspine slightly curved and directed to midline.

Description of the nymph of Thraulodes sternimaculatus Lima, Mariano amp; Pinheiro, 2013 (Leptophlebiidae: Ephemeroptera) from Northeastern Region of Brazil.

Thraulodes Ulmer, 1920 is one of the most abundant and widespread genera of Leptophlebiidae represented by 66 species (Barber-James et al. 2013; Gonçalves et al. 2013; Lima et al.

Evaluating the habitat integrity index as a potential surrogate for monitoring the water quality of streams in the cerrado-caatinga ecotone in northern Brazil.

Human activities have long been altering the natural conditions of streams, including the quality of their water, throughout most of Brazil. This problem is even worse in regions with low rainfall levels, such as the Brazilian Northeast, where water quality needs to be monitored more carefully. In this context, the present study investigated the effects of environmental integrity on the physicochemical characteristics of the streams of the basin of the Itapecuru River in northeastern Brazil.

New genus and new species of Chauliodinae (Insecta: Megaloptera: Corydalidae) from Brazil.

A new genus and new species of Chauliodinae are described and illustrated, Puri gen. nov. and P.