Caenis fittkaui Malzacher, 1986

(Figs 6G, H)

Caenis fittkaui Malzacher, 1986: 91; Salles et al. 2010: 304; Shimano et al. 2011: 245; Lima et al. 2015a: 3; Lima & Boldrini, 2016: 3; Lima et al. 2016b: 215.

Distribution. Brazil: states of Bahia, Espírito Santo, Mato Grosso, Pará, Pernambuco, and Roraima. New record: Piauí State.

Material examined. One ♂ imago, Brazil, Piauí, Campo Maior, Lagoa do Arain, S4°50’26.1”, W42°10’50.1”, 119 m a.s.l., 21.ix.2014, Lima, L. R . C. col. (CEHJ). One ♂ imago, Brazil, Piauí, Piracuruca municipality, Rio Piracuruca, Prainha, S03°56’15.9”, W41º42’36.1’’, 74 m a.s.l., 10.xii.2015, Silva, A.P.S. col. (CEHJ). One ♂ imago, Brazil, Piauí, Barras municipality, Rio Marataoan, Pesqueiro, P 1, S04°15’13.7”, W42°17’19.1”, 84 m a.s.l., 10.xii.2015, Silva, A.P.S. col. (CEHJ) .

Comments. Caenis fittkaui can be differentiated from other species of Caenis by the following characters: apex of forceps sharp and directed posteriorly, lobes of penis fused, forming a rounded head and with small tubercles distributed on the ventral surface (adapted from Malzacher 1986).