Accepted by F. Salles: 2 Jul. 2014; published: 22 Jul. 2014 ZOOTAXA ISSN 1175-5326 (print edition) ISSN 1175-5334 (online edition) Copyright © 2014 Magnolia Press Zootaxa 3838 (5): 575–582 www.mapress.com/zootaxa/ Article 575 http://dx.doi.org/10.11646/zootaxa.3838.5.6 http://zoobank.org/urn:lsid:zoobank.org:pub:1056FA95-E8B8-4F9B-9080-62CC6CBD36FA First description of imago and redescription of nymph for Cloeodes irvingi Waltz & McCafferty, 1987 (Ephemeroptera: Baetidae) LUCAS R. C. LIMA 1,3 , LUKE M. JACOBUS 2 & ULISSES PINHEIRO 1 1 Centro de Ciências Biológicas, Laboratório de Porifera, Universidade Federal de Pernambuco, Brazil, CEP 50670-420, Recife, Per- nambuco. E-mail: uspinheiro@hotmail.com 2 Division of Science, Indiana University Purdue University Columbus, 4601 Central Avenue, Columbus, Indiana 47203, USA. E-mail: luke.jacobus@gmail.com 3 Corresponding author. E-mail: lucaslima_86@hotmail.com Abstract The male imago of Cloeodes irvingi Waltz & McCafferty, 1987 is described for the first time based on reared nymphs collected from the state of Pernambuco, northeastern Brazil. It is differentiated from Neotropical congeners, among other characteristics, by the marginal intercalary veins being paired, except between veins ICu1–ICu2 and ICu2–CuP where they are single and between Sc–R1 and CuP–A where they are absent; segment II of forceps with a medial constriction; and the posterior margin of the subgenital plate being rounded. The nymph of this species is redescribed based on new and original specimens. It is differentiated from Neotropical congeners, among others characteristics, by having a labrum with a dorsal arc composed of 2 + 0 + 2 long, spine-like setae, a labial palp segment III that is subquadrangular, and the fore femur with an apex that is not projected, with 2 blunt setae. Key words: aquatic insects, mayflies, taxonomy, Brazil, Neotropical Region Introduction Cloeodes Traver (1938) has a widespread pantropical distribution with representatives in Africa (Waltz & McCafferty 1994; Jacobus et al. 2006), Madagascar (Lugo-Ortiz et al. 1999), Southeast Asia (Soldán & Yang 2003) and the Americas (e.g., Traver 1938; McCafferty & Lugo-Ortiz 1996; Wiersema & Baumgardner 2000; McCafferty et al. 2004; Nieto & Richard 2008; McCafferty et al. 2012). In South America, there are 23 species known: eight from nymphs, five from adults, and ten from both nymphs and adults (Nieto & Richard 2008; Gonçalves et al. 2010; Massariol & Salles 2011; Nieto & Emmerich 2011; Massariol et al. 2013). In Brazil, 11 species are reported (Salles et al. 2014). Cloeodes irvingi Waltz & McCafferty, 1987 was described based only on nymphs from Paraguay, and later reported from Brazil (Salles et al. 2003, 2004, 2010; Boldrini et al. 2012; Lima et al. 2012). With the increase in knowledge about species diversity within Cloeodes, the original description of C. irvingi has become inadequate for differentiating it from other congeners in South America, which led us initially to misidentify some recently collected specimens of C. irvingi. However, the comparison of these specimens with C. irvingi type material deposited at the Purdue University Entomological Research Collection, West Lafayette, Indiana, USA (PERC), revealed them to be C. irvingi. The aim of this paper, therefore, is to describe for the first time the male imago of C. irvingi, which we have associated through rearing, and to redescribe the nymph based on the original material and an expanded collection of materials from several localities in state of Pernambuco, northeastern Brazil.