Brasilocaenis irmleri Puthz, 1975

Nascimento, Stênio R. S., Rodrigues, Jackson A. O., Ale-Rocha, Rosaly & Lima, Lucas R. C., 2022, New species and records of Caenidae Newman, 1853 (Insecta: Ephemeroptera) from Northeastern Brazil, Zootaxa 5133 (1), pp. 110-122 : 117

Brasilocaenis irmleri Puthz, 1975

( Figs 6A, B )

Brasilocaenis irmleri Puthz, 1975: 12 ; Irmler, 1975: 348; Malzacher, 1986: 85 (male, female, nymph, egg); Malzacher, 1998: 3; Lima & Boldrini, 2016: 2 (adult); Lima et al. 2019: 91.

Brasilocaenis irmeli, Shimano et al. 2011: 245 (misspelling).

Distribution. Bolivia. Colombia. Brazil: states of Amazonas, Mato Grosso and Roraima. New record: Piauí State.

Material examined. Four nymphs and one ♂ imago, Brazil, Piauí State, Campo Maior municipality, Lagoa do Arain , S4°50’26.1”, W42°10’50.1”, 119 m a.s.l., 05.x.2014, Lima, L. R.C. col. ( CEHJ). Four nymphs and three ♂ imagos (reared), Brazil, Piauí State, Jatobá do Piauí municipality, Cachoeira de Pedra Negra, P 1, S5º01’22.4”, W41º56’29.9”, 141 m a.s.l., 11.vii.2015, Silva, A.P.S. coll. ( CEHJ). Three ♂ imagos (light trap), Brazil, Piauí State, Batalha municipality, Longá River, Cachoeira do Urubu , S3°54’47.9”, W42°6’47.70”, 40 m a.s.l., 17.iv.2017, Lima, L. R.C., Moreno, L.A.S. cols. 15 ♂ imagos (light trap), Brazil, Piauí State, Alto Longá municipality, Longá River, Cachoeira da Campeira , S5°11’45.1” W42°15’33.9”, 177 m a.s.l., 27.iv.2017, Moreno, L.A.S. col. ( CEHJ) .

Comments. Brasilocaenis irmleri is related to the group of South American Caeninae with apically pointed forceps. It is easily distinguished from all Brasilocaenis species by the very long styliger plate with posterior margin rounded and forceps enlarged near base and narrow toward the apex, and fused to lateral margins of styliger plate (adapted from Puthz 1975).

Figures

FIGURE 6. Male imagos, body dorsal view and genitalia ventral view: A–B, Brasilocaenis irmleri; C–D, B. elidioi; E–F, Caenis chamie; G–H, C. fittkaui. (Scale: Figs 5A, C, E, F = 1 mm; Figs 5B, D, F, H = 0.2 mm).