Heteragrion is the most speciose and complex genus of neotropical Megapodagrionidae, with 47 species and one subspecies, and many of them are poorly defined. To improve the knowledge of the Brazilian species of the genus, 179 specimens of 13 of the 17 described species were examined. Four new species are described in tribute to the 40 thanniversary of the rock band Queen: Heteragrion freddiemercuryi (Holotype: Peruíbe (24º 22' 48" S & 47º 04' 40" W—10 m), São Paulo State—09-III-2000); H. brianmayi (Holotype and allotype: Parque Estadual da Serra do Mar—Núcleo Caraguatatuba, Caraguatatuba (23º 35' 36" S & 45º 25' 07" W—61 m), São Paulo State—05-II-2000 and 10-III-2002); H. rogertaylori (Holotype and allotype: Fazenda Trabiju, Pindamonhangaba (22º 50' 40" S & 45º 31' 01" W—651 m), São Paulo State—26-III-1999); and H. johndeaconi (Holotype and allotype: Alto Paraíso de Goiás (14º 10’ 55" S & 47º 38’ 36" W—1198 m), Goiás State—18-VI-2008 and 17-VI-2008), holotypes, allotypes and most paratypes deposited in FAAL.Diagnostic illustrations of all species studied are provided. Color photographs of live individuals of H. brianmayi, H. aurantiacum, H. consors, H. mantiqueirae, H. tiradentense and H. triangulare are also presented.

Heteragrion itacolomii sp. nov. (♂ holotype: Brazil, Minas Gerais, Ouro Preto, Parque Estadual do Itacolomi, Trilha da Lagoa, 1350m, 23-xii-2018, 20º25’57”S, 43º30’27”W; and ♀ allotype, same data as holotype, but collected in tandem 20-iii-2019, deposited in ABMM – CCT/UFMG collection) is described and illustrated. The new species is similar to H. tiradentense Machado & Bedê, 2006, H. muryense Costa & Santos, 2000 and H. mantiqueirae Machado, 2006, based on coloration of the thorax and has cerci similar to those of H. freddiemercuryi Lencioni, 2013. It belongs to Group A and differs from other congeners by the morphology of the ventral expansion and the medial process of the cerci in males. Information about the intersternite of the single female specimen is also provided.

A new genus of Coenagrionidae is described from Brazil, Angelagrion (type species Angelagrion fredericoi sp. nov.) including two new species, A. fredericoi sp. nov. and A. nathaliae sp. nov.. The new genus is characterized by an enormous and modified internal fold of genital ligula, abdominal segments S8-10 dark brown or black contrasting with mostly bluish abdomen, sternum of S8 in males with a circular bluish-white spot, and short CuA.

This paper describes the composition and distribution of Anisoptera and Zygoptera (Odonata) species of the upper Rio das Velhas in the municipality of Ouro Preto, Minas Gerais State, Brazil. A total of 727 specimens of 40 species were collected near water bodies over a period of 23 months between 2015 and 2017. The families with greatest species richness were Libellulidae (13 species), Coenagrionidae (12 species) and Heteragrionidae and Aeshnidae (4 species each). Notable among the species collected were Perilestes fragilis Hagen in Selys, 1862, inhabiting well-preserved forests, Minagrion waltheri Santos, 1965, pertaining a endemic genus of Brazil and the recently described Heteragrion cauei Ávila-Júnior et al., 2017, and three species recorded for the first time for the state: Elasmothemis alcebiadesi (Santos, 1945); Erythrodiplax melanica Borror, 1942 and Erythrodiplax acantha Borror, 1942, the latter is considered Critically Endangered (CR) by the International Union for Conservation of Nature's (IUCN) Red List.

We record the first occurrence of Mecistogaster amalia (Burmeister, 1839) for the state of Rio Grande do Norte, Brazil, which is the first record of this genus and family for the whole Northeast Region of Brazil. This record is based on four collected samples and extends by more than 1,500 km to the north, the area known of distribution of this species.

The species currently included in Leptagrion Selys, 1876 are found to belong in five different genera: Leptagrion sensu stricto, including the type species Leptagrion macrurum (Burmeister, 1839), two previously described species, viz, Leptagrion bocainense Santos, 1979 and Leptagrion auriceps St. Quentin, 1960 (here recovered from synonym), and Leptagrion vilelai sp. nov.; Fredyagrion gen. nov. to include Leptagrion andromache Hagen in Selys, 1876, Leptagrion dispar Selys, 1876, Leptagrion elongatum Selys, 1876, Leptagrion aculeatum Santos, 1965a, Leptagrion capixabae Santos, 1965b, Leptagrion siqueirai Santos, 1968b, Leptagrion vriesianum Santos, 1978, Leptagrion afonsoi Machado, 2007, Leptagrion lencioninetoi Lencioni, 2017b, Leptagrion itabaiana Vilela et al., 2021a, and Leptagrion jeromei Lencioni, Vilela & Furieri, 2021 in Vilela et al., 2021b; Nathaliagrion gen. nov. to include Leptagrion porrectum Hagen in Selys, 1876 and Leptagrion perlongum Calvert, 1909; Machadagrion gen. nov. to include Leptagrion garbei Santos, 1961, Leptagrion dardanoi Santos, 1968a and Leptagrion cyanostigma Machado, 2012; Kiautagrion gen. nov. for and Leptagrion acutum Santos, 1961. Diagnostic illustrations of all species are presented.

The last-instar larva of Microstigma maculatum Hagen in Selys, 1860 is redescribed and illustrated based on a reared larva collected in a water-filled hole of a fallen tree trunk within an urban forest fragment in Manaus, Amazonas, Brazil.

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