Hydromastodon sallesi, new genus and new species of Atalophlebiinae (Insecta: Ephemeroptera: Leptophlebiidae) from West and North of Brazil, and notes on systematics of Hermanella group Author Polegatto, C. M. Author Batista, J. D. text Zootaxa 2007 2007-10-19 1619 1 53 60 https://biotaxa.org/Zootaxa/article/view/zootaxa.1619.1.3 journal article 10.11646/zootaxa.1619.1.3 1175­5334 5103258 507B8935-E04E-4FB0-B890-47EB5426A8B0 Hydromastodon sallesi Polegatto and Batista , new species ( Fig. 1 -21) Mature nymph, male . In alcohol. Body length: ca. 6.7mm, without caudal filaments; head ca. 1.4mm. Head (Fig. 2). Color pattern: head of male nymph light brown, upper portion of eyes orange-brown, lower portion black; in male, lower portion of eyes about 1/5 width of upper portion. Antennae 1,6 length of head. Labrum ( Fig. 13 ): dorsal surface with fourteen to fifteen long setae; ventral surface with long setae in a oblique row decreasing posteriorly, and short setae on posterior area; posterior and lateral margin with short and relatively long setae respectively. Hypopharynx: as in Fig. 18. Left mandible (Fig. 21): incisors with three denticles, one prominent denticle and two smaller; prostheca with numerous long and fine setae, and two hard setae; mola with a prominent and hard posterior area. Right mandible (Fig. 19-20). Anterior incisor with three denticles, one of them prominent, posterior incisor with two subequal denticles; prostheca more slender than right, with long and fine setae. Maxillae (Fig. 16-17). Setae on crown of galeolaciniae numerous, and with setae on the base of tooth; setae on medial galealacinial margin fine and long in a single row, except on anterior region with two rows; all setae as in Fig. 13 ; third segment of maxillary palpi with long and fine setae in six parallel rows; apex of third segment bare and soft (Fig. 17). Labium (Fig. 14-15). Glossae and paraglossae with setae as in Fig. 14; labial palp: segment two with nine long dorsal setae, segment three with long setae concentrated ventrally, third segment with fifteen-sixteen short spine-like setae on inner margin (Fig. 15). Thorax . Color pattern: thorax brown, legs light brown. Pronotum with weak anterolateral angle, with two setae. Legs (Fig. 7-10). Femora with long, strong and fine setae on posterior margin, and short setae on anterior margin; tibiae with long fine setae on anterior margin, scarce on third tibiae; long setae on all femora and on third tibiae, clavate apically (Fig. 10); short setae on median margin of tibiae and tarsi as in Figs. 7-9; tarsal claws ( Fig. 6 ) with subequal denticles, three apical and five at middle point, in two separate rows. Abdomen (Fig. 4). Color pattern: segments 1 to 5 pigmented of black, segments 6 to 10, with color pattern as in Fig. 4. Segments 6 to 9 with posterolateral spines. Gills (Fig. 11) with a minute fine apical projection. Mature nymph, female . In alcohol. Color pattern: Head and abdomen of female nymph with pattern as in Figs. 3, 5; thorax with color similar to male; segments 1 to 5 pigmented of black as in male, but with small areas lighter; segments 6 to 10 similar of in males, as in Fig. 5. Diagnosis : This species can be distinguished from Hydromastodon mikei (Thomas & Boutonnet, 2004) , by the the following combination of characters: presence of posterolateral spines on abdominal segment 6 to 9; absence of spots in tibiae and tarsi; more numerous dorsal setae on labrum; prominent and hard posterior area of left mola; and color pattern of abdomen. Adults : unknown. Etymology : The name of species is in honour to my friend Frederico Falcão Salles, a great specialist in Ephemeroptera in Brazil . Material examined : Holotype : mature nymph male, North of Brazil State of Roraima , Bem Querer Stream , 18-X-2004 ., Frederico F. Salles . Paratypes : 1 mature nymph female, same of holotype , 1 imature nymph male, West of Brazil , State of Mato Grosso , near to Nova Xavantina , Pindaíba Stream ; II-2003 ; Joana D. Batista & Helena S. R . Cabette . The holotype and 1 paratype are deposited in the National Research Institute of Amazon , and 1 paratype is deposited in the Museum of Zoology of the University of São Paulo ( MZSP ) , São Paulo .