Alterosa affinis, Dumas, Leandro Lourenço & Nessimian, Jorge Luiz, 2013

Dumas, Leandro Lourenço & Nessimian, Jorge Luiz, 2013, New species of the caddisfly genus Alterosa Blahnik 2005 (Trichoptera: Philopotamidae: Philopotaminae) from Brazil, Zootaxa 3609 (1) : -

Alterosa affinis , new species

Figs. 1 A–E

Alterosa affinis sp. nov. is clearly a member of the A. falcata Group, as defined by Blahnik (2005), by sharing the arched, curved intermediate appendages and a small number of large phallic spines. The new species is closely related to Alterosa falcata Blahnik 2005 . It differs in having the intermediate appendages shorter than the preanal appendages, and in having the crest-like projection on tergum X smaller and more subapical in position. The preanal appendages are more robust in the new species, having the subacuminate projection much more elongate.

Adult. Color (in alcohol) brown; legs, palps, and antennae pale brown, forewings irregularly mottled with pattern of light brown spots between main stems of R and M. Male forewings each 5.8–7.1 mm (n=3).

Male genitalia. Tergum VIII with posteromesal margin deeply emarginate, emargination V-shaped and extending more than halfway to anterior margin. Sternum IX with anterolateral margin broadly rounded; posteroventral margin greatly produced, extending in broad arc or almost linearly from dorsum ( Fig. 1 A). Tergum IX greatly reduced, membranous or fused to base of tergum X ( Fig. 1 B). Tergum X subtriangular, tapered from base in dorsal view; tergum midlaterally with patch of adpressed seta-like spines; dorsally with small preapical projection, forming small prominence as viewed laterally; apex sensillate, rounded ( Figs. 1 A, 1B). Intermediate appendages heavily sclerotized, moderately elongate, not surpassing preanal appendages, sickle-shaped, slightly arched, apex curved downward, acute apically ( Figs. 1 A, 1B). Preanal appendages half as long as tergun X, robust, not greatly modified, constricted basally, with small scant setae and several minute seta-like spines; apex abruptly narrowed, forming long subacuminate projection, without apical setae ( Figs. 1 A, 1B). Inferior appendages elongate, linear, flattened on mesal surface, setose; 1st article, in lateral view, approximately 2 times as long as wide; 2nd article subequal in length to 1st article, relatively narrow, especially at midlength, slightly narrower basally than apex of 1st article; apex rounded, with prominent pad of short, stiff apicomesal setae ( Figs. 1 A, 1C). Phallobase tubular, relatively short and wide, slightly curved near base; endotheca with 7 large sclerotized, nail-like phallic spines; phallotremal sclerites indistinct ( Figs. 1 D, 1E).

Holotype male: BRAZIL: Minas Gerais: Alto Caparaó, Parque Nacional do Caparaó, Rio Caparaó, Vale Verde, 20°25’11.6”S, 41°50’44.8”W, el. 1306 m, 05.x.2010, JL Nessimian & IC Gonçalves leg. (DZRJ 3476).

Paratypes: BRAZIL: Espírito Santo: Castelo, Parque Estadual do Forno Grande, afluente do Rio Caxixe, 20°31’05.6”S, 41°05’09.0”W, el. 1156 m, 29.iii.2011, LL Dumas & JL Nessimian leg., 1 male (DZRJ 3477); Castelo, Pedregulho, Furlan, Ribeirão da Batéia, Cachoeira do Pedregulho, 20°33’39.8”S, 41°05’06.1”W, el. 791 m, 30.iii.2011, LL Dumas & JL Nessimian leg., 1 male (DZRJ 3478); Dores do Rio Preto, Parque Nacional do Caparaó, Pedra Menina, tributary of Rio Preto, 20°29’38.0”S, 41°49’18.2”W, el. 1480 m, 25.iii.2012, ALH Oliveira & GA Jardim leg., 2 males (DZRJ 3499); Iúna, Serra do Caparaó, Rio Claro, Cachoeira do Rogério, 20°22’05.5”S, 41°49’51.5”W, el. 1071 m, 24.iii.2012, GA Jardim & JL Nessimian leg., 1 male (DZRJ 3500); Minas Gerais: Alto Caparaó, Parque Nacional do Caparaó, Rio Caparaó, Vale Verde, 20°25’11.6”S, 41°50’44.8”W, el. 1306 m, 24.iii.2012, ALH Oliveira & JL Nessimian leg., 1 male (DZRJ 3501); Alto Caparaó, Parque Nacional do Caparaó, tributary of Rio José Pedro, 20°24’35.0”S, 41°50’56.7”W, el. 1792 m, 23.iii.2012, ALH Oliveira & JL Nessimian leg., 1 male (DZRJ 3502).

Distribution: Brazil (Espírito Santo and Minas Gerais states).

Etymology: The epithet of the specific name is from the Latin word affinis (related to, neighboring), referring to the great affinity of the new species to Alterosa falcata .

Figures

FIGURE 1. Alterosa affinis, new species, male genitalia. 1 A, left lateral view; 1 B, dorsal view; 1 C, left inferior appendage, dorsal view; 1 D, phallic apparatus, left lateral view; 1 E, phallic apparatus, dorsal view. Abbreviations: inf. ap. — inferior appendage; int. ap. — intermediate appendage; pr. ap. — preanal appendage; ter. X—tergum X.