Helicopsyche (Feropsyche) angeloi, Holzenthal, Ralph W., Blahnik, Roger J. & Calor, Adolfo R., 2016

Holzenthal, Ralph W., Blahnik, Roger J. & Calor, Adolfo R., 2016, Three new species of Helicopsyche von Siebold (Trichoptera: Helicopsychidae) from Brazil, Zootaxa 4078 (1), pp. 344-353 : 346

Helicopsyche (Feropsyche) angeloi sp. nov.

( Figures 1 A–E)

Material examined. Holotype male. BRAZIL. Minas Gerais: Córrego das Águas Pretas & tribs., ca. 15 km S Aiuruoca, 22°03.704’S, 44°38.241’W, el. 1386 m, 21.xi.2001, Holzenthal, Paprocki, Blahnik and Neto leg., UMSP 000082582 (pinned) ( MZSP). Paratypes: Minas Gerais: same data as holotype, 2 males, 2 females (pinned) ( UFBA), 7 males, 7 females (pinned) ( UMSP); Rio Tanque, ca. 12 km (rd) from Ipoema, 19°32.208’S, 43°26.878’W, el. 750 m, 16.V.1998, Holzenthal and Paprocki leg., 1 male (alcohol) ( UMSP); Parque Estadual de São Gonçalo do Rio Preto, Córrego das Eguas, 18°08.716’S, 43°22.157’W, el. 891 m, 14.x.2000, Paprocki, Amarante and Isaac leg., 1 male (alcohol) ( MZSP); São Paulo: Estação Biológica de Boracéia, Rio Coruja, 23°40.10’S, 45°53.96’W, el. 850 m, 18.iv.1998, Holzenthal, Melo and Froehlich leg., 1 male (pinned) ( UMSP); Rio de Janeiro: Rio Macacu (2nd order) on RJ 116, km 62, 22°23.201’S, 42°33.945’W, el. 840 m, 17.iii.1996, Holzenthal, Rochetti and Oliveira leg., 1 male, 6 females (pinned) ( UMSP).

Diagnosis. Helicopsyche angeloi sp. nov. is similar to H. timbira Silva, Santos & Nessimian, 2014 , H. cipoensis Johanson & Malm, 2006 , and H. guara , sp. nov., all from Brazil. All of these species have clavate inferior appendages, each without an acute apical projection on the posterior margin and with prominent basomesal lobes of the inferior appendages, evident in lateral view. All, except H. guara sp. nov., also have nearly linear rows of setae on tergum X. The overall shapes of the inferior appendages are most similar between H. angeloi sp. nov. and H. timbira in being narrow in lateral view. However, in H. angeloi sp. nov., the inferior appendages bear very prominent spine-like setae on their apicomesal face and mesally at midlength. These prominent setae are not present on the inferior appendages in any of the other species. Also, the apex of segment X is slightly cleft in H. timbira , but entire in H. angeloi sp. nov.

Description. Male. Overall color (pinned) nearly uniformly medium brown; dorsum of head with whitish setae, especially between antennae; antennae light brown; palps dark brown. Tibial spur formula 2, 4, 4. Forewing: length 4.5–5.0 mm (n = 10); covered with fine, short, brown setae, anal margin with whitish setae. Abdominal sternum VI process long, almost as long as segment VI, tubular along its length, oriented posteroventrally, nearly straight in lateral view, with microtrichiae along length, apex tapering, with lamellae apicoventrally ( Fig. 1 E). Genitalia. Segment IX long ventrally; anteromesal margin well-developed; lateral apodeme well developed, located midlaterally on segment ( Fig. 1 A). Segment X conical along basal 2/3, tapering to apex, not divided apically; mesodorsal borders inverted Y-shaped, bearing 2 nearly linear rows of 10–12 setae along length ( Fig. 1 B); in lateral view, ventral margin almost straight, dorsal margin parallel to ventral margin along basal half, apical half angled posteroventrally ( Fig. 1 A). Superior appendage originates dorsolaterally, short, setose, rounded ( Fig. 1 A). Inferior appendage clavate, with anterior margin slightly concave and posterior margin convex; apicodorsal margin undulate, with long setae along apical margin ( Figs 1 A, C) and spine-like setae apicomesally; 4 spine-like setae at midlength, each on distinct protuberance ( Figs 1 A, C); basomesal lobe of inferior appendage well-developed, ovate, apically bearing 8–10 spine-like setae ( Figs 1 A, C); basal plate of inferior appendages nearly straight in lateral view ( Fig. 1 A), narrow along its length, tapering apically ( Fig. 1 B). Phallus tubular, slightly down-curved along its length; phallobase narrow, slightly inflated basodorsally, narrow in the middle, apicoventral half strongly sclerotized, acuminate apically; endotheca a large, long, membranous lobe extending dorsally over endophallus; endophallic membranes extended laterally as rounded lobes; phallotremal sclerite small, quadrangular ( Fig. 1 D).

Etymology. Named in honor of Dr. Angelo B. M. Machado, the first Brazilian researcher to describe a species of Helicopsyche , H. planorboides Machado, 1957 , on the occasion of his 80th birthday.

Distribution. Brazil (Minas Gerais, Rio de Janeiro, and São Paulo).

Figures

FIGURE 1. Helicopsyche (Feropsyche) angeloi sp. nov., male. A. genitalia, lateral view; B. segments IX and X, dorsal view; C. inferior appendage, ventral view; D. phallus, lateral view; E. sternum VI, lateral view. Abbreviations: IX = segment IX; X = tergum X.