Oiovelia viannai Rodrigues & Melo in Rodrigues et al., 2014

(Figures 11, 16–17)

Material examined. BRAZIL, Minas Gerais State: apterous male, holotype, Luz, Ribeirão Jorge Grande, 19º40’13”S / 45º36’37”W, 27.IV.2010, H.D.D. Rodrigues leg. Paratypes: 1 macropterous male, 2 apterous females, same data as holotype, except 06.I.2010; 2 apterous males, 1 macropterous female, same data as holotype, except 13.III.2010, H.D.D. Rodrigues & G.J.C. Vianna leg. Bahia State: 1 apterous female, Andaraí, Chapada Diamantina, #28, Cachoeira do Rio Roncador, Marimbus, 12°41’57.6”S / 41°21’26.1”W, 323 m a.s.l., N. Hamada, J.M.C. Nascimento & J. O. Silva leg. All in MZUSP.

Remarks. It is common to find more than one species of Oiovelia in the same foam mass and O. cunucunumana (Fig. 15) occurred together with O. viannai (Figs 16–17) in the State of Minas Gerais, at a brown water stream without formation of foam (Rodrigues et al. 2014). The same two species were found co-occurring in foam mass from a dark water stream in the State of Bahia, which represents the first record of the genus from Northeastern Brazil. Oiovelia cunucunumana is the species with the largest range within the genus, with records from Venezuela to Argentina. Oiovelia viannai is a recently described species, and until now was known only from the type locality in the State of Minas Gerais, Southeastern Brazil.

The occurrence of specimens of Oiovelia outside foam masses appears to be a secondary option, because individuals are rarely found in streams or rivers without foam. Additionally, in field trips in the State of Amazonas, northern Brazil, it was noticed that specimens seem to rest on twigs or banks of streams at night, since the number of specimens present on foam at this period is much lower than during the day (HDDR, personal observations).