Alterosa inappendiculata, 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 inappendiculata , new species

Fig. 8 A–D

Alterosa inappendiculata sp. nov. is distinctive within the genus and cannot be placed in any existing species group as defined by Blahnik ( 2005). The new species is easily diagnosed by the apparent absence of intermediate and preanal appendages. Additionally, the long row of stout rod-like setae at midlength of tergum X is also a useful diagnostic character for this species.

Adult. Color (in alcohol) dark brown; legs, palps, and antennae pale brown, wing pattern not discernible. Male forewings each 5.4 mm (n= 1).

Male genitalia. Tergum VIII with posteromesal margin scarcely or not emarginate. Sternum IX with anterolateral margin broadly rounded, especially in dorsal half; posteroventral margin moderately produced, extending in broad arc or nearly linearly from dorsal ( Fig. 8 A) or ventral views. Tergum IX greatly reduced, membranous or fused to base of tergum X ( Fig. 8 B). Tergum X subrectangular as viewed laterally, in dorsal view slightly constricted in basal half, with rounded protrusion bearing rod-like setae at midlength, tapered and subtriangular in apical half; apex sensillate, large, rounded as viewed dorsally, truncate in lateral view ( Figs. 8 A, 8 B). Intermediate and preanal appendages apparent absence ( Figs. 8 A, 8 B). Inferior appendages elongate, setose; 1 st article, in lateral view, approximately 2 times as long as wide, slightly bulging mesally, laterally, and ventrally in middle; 2 nd article subequal in length to 1 st article, relatively wide, base nearly as wide as apex of 1 st article; apex rounded, with small pad of short, stiff apicomesal setae ( Figs. 8 A, 8 C). Phallobase tubular, short, weakly curved at midlength; endotheca without evident spines or phallotremal sclerites ( Fig. 8 D).

Holotype male: BRAZIL: Paraná: Guaraqueçaba, Reserva Natural de Salto Morato , small tributary of Rio Morato , 25 °09’ 53.9 ”S, 48 ° 17 ’ 54.3 ”W, el. 55 m, 25.i. 2011, JL Nessimian & RB Braga leg. (DZRJ 3487).

Distribution: Brazil (Paraná state).

Etymology: The epithet of the specific name, inappendiculata , is from the Latin word appendicis (appendages) and the prefix in- (not, without), referring to the apparent absence of intermediate and preanal appendages.