New species and new records of Miroculis Edmunds, 1963 (Ephemeroptera: Leptophlebiidae) from Chacoan Domain in northeastern Brazil.

The genus Miroculis Edmunds, 1963 (Ephemeroptera: Leptophlebiidae) is endemic to South American with 27 described species. In Brazil, 21 of these are known to occur. The present paper describes three new species of Miroculis Edmunds, 1963. Miroculis (Miroculis) botafora sp. nov. is described based on a male imago collected in a transition area between the Cerrado and Caatinga biomes in Piauí State, Brazil. Two species are described based on nymphs and adults: Miroculis (Miroculis) azevedoi sp. nov. and Miroculis (Miroculis) quilombola sp. nov.; both were collected in a Cerrado region of Maranhão State, Brazil. Additionally, new distribution records of Miroculis (Miroculis) fittkaui Savage & Peters, 1983 are provided.

Two new species of Baetodes Needham & Murphy, 1924 with an updated checklist of Baetidae (Ephemeroptera) of Rondônia state, Brazil.

Baetidae is one of the most taxon-rich families in the order Ephemeroptera, and the most studied mayfly in Brazil. Despite recent advances, the vast majority of the Brazilian territory has not yet had its diversity well documented. Some of these critical gaps are in the South-Western Amazon, with emphasis on the state of Rondônia due to the high level of environmental threat (especially deforestation). In the state, only one small survey was carried out 11 years ago. Given this scenario, the objective of this study is to describe two new species and provide access to primary biodiversity data of the family Baetidae in Rondônia. As a result, two new species, Baetodes vermelho sp. nov. and Baetodes cerejeiras sp. nov., are described. Baetodes vermelho sp. nov. can be differentiated from other species by the presence of robust and pointed setae on the dorsal margin of the femora and coxal gills with medial constriction; Baetodes cerejeiras sp. nov. can be differentiated from B. liviae Polegatto & Salles, 2008 (in Salles & Polegatto, 2008) and B. capixaba Souza, Salles & Nessimian, 2011 by the absence of a tubercle on the metanotum, the presence of small blunt setae on the dorsal arc of the labrum, and less prominent tubercles on the abdomen. We have documented 50 species across 54 sites in the Rondônia. Among these, 18 species are being reported for the first time in the state, three species are recorded for the first time in the north of Brazil, and two species are new records for Brazil. Rondônia is the most speciose state in Brazil regarding the family Baetidae.

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. In the present work, we provide the description of a new species to the genus based on nymphs and male imagos and provide description of the nymphal stage of T. maranhensis, based on collections from Maranhão State. Additionally, an updated key of male imagos is provided.

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. (1976) provided the generic description for the supposed nymph of Hermanellopsis. However, Savage Peters (1983) revised the genus, and study of related genera raised doubt about the identity of the proposed nymph. Thus, the nymph of Hermanellopsis has remained unknown until now.

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. 2013; Souto et al. 2014; Zúñiga et al. 2015; Boldrini et al. 2018; Campos Mariano 2019). Its distribution extends from Central Argentina in the Neotropics to the Neartic Region. For Brazil, 23 species are known (Salles Boldrini 2019), but only seven species are known from both adult and nymphal stages: T. bonito Gonçalves, Da-Silva Nessimian; T. cochunaensis Domínguez; T. daidaleus Traver Edmunds; T. jones Gonçalves, Da-Silva Nessimian; T. itatiajanus Traver Edmunds; T. schlingeri Traver Edmunds and T. traverae Thew (Thew 1960; Traver Edmunds 1967; Domínguez 1987; Lopes et al. 2003; Gonçalves et al. 2010; Gonçalves et al. 2013).

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.

New species and new records of Coryphorus Peters, 1981 (Ephemeroptera: Coryphoridae) from Brazil.

A new species Coryphorus is presented,  based on recent collections from Northeastern Brazil and specimens deposited in the Museu Regional de Entomologia da Universidade Federal de Viçosa (UFVB) and Coleção Zoológica da Universidade Federal de Roraima (UFRR). Coryphorus molinerii sp. nov. is described based on male imagos and can be distinguished by the penis with rounded margins and forceps with segment II narrow and sharpening towards apex. Besides, C. aquilus Peters, (1981) is reported for Tocantins State for the first time.