Brasilocaenis irmleri Puthz, 1975

Nascimento, Stênio R. S., Cruz, Paulo V., Lima, Lucas R. C., Lima, Cláudia R. T., Hamada, Neusa & Ale-Rocha, Rosaly, 2023, New species and records of Caenidae Newman, 1853 (Insecta: Ephemeroptera) from Rondônia State, Northern Brazil, Zootaxa 5339 (3), pp. 237-255 : 250

Brasilocaenis irmleri Puthz, 1975 ( Figs. 10C–D )

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; Nascimento et al. 2022: 117 .

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

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

Material examined. One ♁ imago (light trap), Brazil, Rondônia State, Rolim de Moura municipality, Waterfall , road 192 south, S11°50’34.8”, W61°42’50.3”, 21.viii.2022, Nascimento, S. R . S., Cruz, P. V ., Lima, C. R . T . cols. ( INPA); four ♁ imagos (light trap), Brazil, Rondônia State, Ji-Paraná municipality, Urupá River , S11°02’07.8”, W62°08’41.5”, 23.viii.2022, Nascimento, S. R . S., Cruz, P. V ., Lima, C. R . T . cols. ( INPA); two ♁ imagos (light trap), Brazil, Rondônia State, Costa Marques municipality, Guaporé River , S12°27’50.0”, W64°10’32.8”, 25.viii.2022, Nascimento, S. R . S., Cruz, P. V ., Lima, C. R . T . cols. ( INPA).

Comments. Brasilocaenis irmleri it is easily distinguished by the very long styliger plate with posterior margin rounded, forceps enlarged near base narrowing toward the apex, and fused to lateral margins of the styliger plate (adapted from Puthz 1975). This species is related to the group of South American Caeninae with apically pointed forceps. The specimens collected in the State of Rondônia did not show any morphological variation when compared to the original description of B. irmleri .

Figures

FIGURE 10. Male imagos, body dorsal view and genitalia ventral view: A–B, Brasilocaenis elidioi; C–D, B. irmleri; E–F, Caenis chamie; G–H, C. fittkaui; I–J Latineosus sigillatus. (Scale: Figs. 10A, C, E, G, I = 1 mm; Figs. 10B, D, F, H, J = 0.1 mm).