Review of the genus Camelobaetidius Demoulin (Ephemeroptera: Baetidae) with reduced terminal filament Author Boldrini, R. Author Salles, F. F. Author Pes, A. M. O. text Journal of Natural History 2012 2012-08-31 46 33 - 34 2033 2073 http://dx.doi.org/10.1080/00222933.2012.708447 journal article 10.1080/00222933.2012.708447 1464-5262 5201875 Camelobaetidius mantis Traver and Edmunds, 1968 (Figure 7C) Traver and Edmunds 1968: 675 ; Dominique et al. 2001: 40 ; Dominique et al. 2002: 18; Domínguez et al. 2002: 462 ; Thomas et al. 2003: 130 ; Salles, Andrade and Da-Silva 2005: 52 ; Salles, Serrão and Pereira 2005: 70 ; Salles and Serrão 2005: 276; Domínguez et al. 2006: 133 ; Dias et al. 2009: 238 . Diagnosis Camelobaetidius mantis differs from the other described species of the genus with the terminal filament reduced based on the following combination of characteristics of nymphs: (1) segment II of labial palp with distomedial projection strongly produced; (2) forefemur with prominent protuberance on inner margin (as in Figures 9A , 12A , 14A ); (3) foretibia with indentation at apex; (4) thoracic gill absent at the base of forecoxa; (5) tarsal claws with 25 denticles. Comments This species was described based on one nymph from Brazil , Amazonas ( Traver and Edmunds 1968 ). According to the field book of Ernest Josef Fittkau, collector of the species, this specimen was collected near Lago do Careiro, Rio Negro. After visiting the type-locality, we could not find areas with moderate or strong currents, making it difficult to collect specimens of the genus. Possibly, this is because the velocity of the water in the area, at least by that time of year, was relatively low. Although some field trips have been held in Rio Negro and locations near the river by the team of the Laboratório de Insetos Aquáticos do INPA no specimens of C. mantis were found. As pointed out by Salles (2010) for Adebrotus amazonicus , the presence of C. mantis in Colombia , as stated by Domínguez et al. (2006) and Dias et al. (2009) , is not correct. Their statement was based on Domínguez et al. (2002) , but these authors reported the species from the Brazilian Amazonian Region, not from Colombia . Camelobaetidius mantis is possibly closely related to the species in which the forefemur has a prominent protuberance on inner margin: C. francischettii , C. leentvaari and C. ipaye . It is differentiated from the first two species by the absence of a medial protuberance on prosternum, and is differentiated from C. ipaye by the number of denticles on tarsal claws, 30–37 versus 25 in C. mantis . Camelobaetidius mantis is similar to C. leentvaari , both have similar relative numbers of denticles on tarsal claw and the presence of a prominent protuberance on inner margin of forefemur. The unique difference between these species is the presence of the medial protuberance on prosternum in C. leentvaari , and the supposed absence of this characteristic in C. mantis (the original description is based on a single, immature nymph). Therefore, we do not rule out the hypothesis that C. mantis is a junior synonym of C. leentvaari . Distribution BRAZIL : Amazonas.