A checklist and new records of Leptophlebiidae (Ephemeroptera) are presented for the Maranhão state, in Brazil’s Northeast Region. Fifteen 15 genera and 20 species of Leptophlebiidae were identified. Farrodes xingu, Hermanellopsis arsia, Hydromastodon sallesi, Miroculis duckensis, Thraulodes marreroi, and Tikuna bilineata are reported for the first time for the Northeast Region, and Miroculitus emersoni is recorded for the first time in Brazil. The number of known species of Leptophlebiidae in Maranhão is increased from three to 21.
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.
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 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.
Brasilocaenis atawallpa was recently described based on male imago from Colombian Amazon. The original description does not contain a designation of type specimens or locality, and it just states that the type series was studied in order to perform the cladistic analysis. In this context, we herein designate the lectotype and paralectotypes of B. atawallpa and describe its nymphal stage. The nymphs were associated to B. atawallpa by the male genitalia extracted from mature nymphs. The nymphal stage of B. atawallpa can be differentiated from others known nymphs of the genus by absence of pointed microspines on opercular gill, fore coxa without projection, middle coxa with well-developed and semicircular projection, hind coxa with finger-like projection, fore and middle tarsal claws without denticles and hind margin of the ninth sternite almost straight.
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