Alterosa affinis Dumas & Nessimian, 2013, new species
Creators: name: Dumas, Leandro Lourenço
name: Nessimian, Jorge Luiz
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Trichoptera
Philopotamidae
Alterosa
Alterosa affinis

description: 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.
description: Published as part of Dumas, Leandro Lourenço & Nessimian, Jorge Luiz, 2013, New species of the caddisfly genus Alterosa Blahnik 2005 (Trichoptera: Philopotamidae: Philopotaminae) from Brazil in Zootaxa 3609 (1), DOI: 10.11646/zootaxa.3609.1.2, http://zenodo.org/record/217702