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Habitat heterogeneity on feeding habit of two sympatric and congeneric characidae fishes in two tropical reservoirs

The insectivorous feeding habit of Astyanax species is highlighted and different feeding strategies between sympatric fishes despite high niche overlap in both environments are revealed.
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First record and new species of Tortopsis Molineri, 2010 (Ephemeroptera, Polymitarcyidae) from Brazil

This new species represents the first record of the genus Tortopsis in Brazil and can be recognized by the color pattern of the head and pronotum, strongly shaded with black in both sexes.
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First record of Ulmeritoides misionensis (Ephemeroptera: Leptophlebiidae) in Brazil

Oligoneuria macabaiba sp. nov. (Insecta: Ephemeroptera) from Brazil.

The former monotypic genus Oligoneuria Pictet is redefined because this species presents similar wing venation, abdominal posterolateral spines, as well as a membranous extension on anterior portion of the head as seen in the genus.
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Two new species of Tricorythodes Ulmer, 1920 (Insecta, Ephemeroptera) from Southeastern Brazil

Two news species of Tricorythodes are described from both, nymph and male imago: Tricorythodes chalaza sp. nov. and Tricorythodes diasae sp. nov. Imagoes of T. diasae sp. nov. can be characterized as…
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Thraulodes bonito sp. nov. (Ephemeroptera: Leptophlebiidae) from Rio de Janeiro State, Southeastern Brazil.

A new species of Thraulodes Ulmer, 1920 is described from Rio de Janeiro based on male imagos, female subimagos and nymphs, which differs from this and all other species of the genus by the wide penes.
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A new species of Thraulodes Ulmer (Ephemeroptera: Leptophlebiidae) from Southeastern Brazil

A new species of the mayfly genus Thraulodes Ulmer is described based on specimens from the states of Rio de Janeiro and Sao Paulo, Brazil that can be easily recognized by abdominal and legs color pattern whether from nymphs or imagos.
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The genus Spaniophlebia (Insecta, Ephemeroptera, Oligoneuriidae): new species, new combination and redescription of S. trailiae

Spaniophlebia male genitalia is described for the first time and the diagnosis of the genus is im- proved in order to encompass this new set of characteristics. Spaniophlebia kayapo sp. nov. is…
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A New Species of Dikrella Oman, 1949 (Hemiptera: Cicadellidae: Typhlocybinae) Found on Caryocar brasiliense Cambess. (Caryocaraceae) in Minas Gerais State, Brazil

A new species of Dikrella is described and figured based on specimens from Minas Gerais, Southeastern Brazil, diagnosed by the process of pygofer and the general form of aedeagus.
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Ephemeroptera, Leptohyphidae, Amanahyphes saguassu Salles and Molineri, 2006: first record from state of Pará, Brazil

Amanahyphes saguassu is similar to Leptohyphodes inanis (Pictet, 1843), sharing both nymph and adult characteristics, showing variability among populations of this species.
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