Alterosa capixaba, 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 capixaba , new species

Figs. 5 A–D

Alterosa capixaba sp. nov. possibly belongs to A. marinonii Group, as defined by Blahnik (2005). As the other members of A. marinonii Group, the new species shares the greatly modified preanal appendages, which are armed with stout, modified setae. However, some characters are inconstant among the species of A. marinonii Group, like the general structure of segment IX and the shorter 2nd article of each inferior appendages. So, the placement of the new species within the A. marinonii Group is merely speculative. Additionally, A. capixaba sp. nov. also resembles A. truncata Blahnik 2005 and A. shadrackorum Blahnik 2005 (although they do not belong to A. marinonii Group) in possessing 2nd article of each inferior appendage broad and truncate. However, in the new species the apical setae of the 2nd article of the inferior appendage are almost posteriorly oriented, rather than forming a mesal pad.

Adult. Color (in alcohol) brown; legs, palps, and antennae pale brown, wing pattern not discernible. Male forewings each 6.5–7.7 mm (n=5); female forewings each 6.8 mm (n=1).

Male genitalia. Tergum VIII with posteromesal margin scarcely or not emarginate. Sternum IX with anterolateral margin extending almost linearly from dorsum; posteroventral margin not produced, subtruncate ( Fig. 5 A). Tergum IX greatly reduced, membranous or fused to base of tergum X ( Fig. 5 B). Tergum X greatly narrowed, especially in dorsal view; basally with long, narrow incision, bearing paired lateral edges; mesally with small crestlike projection; tergum with large basolateral margins weakly protruding, apices acute and curved slightly posterad; apex sensillate, rounded as viewed dorsally, rounded and moderately enlarged in lateral view ( Figs. 5 A, 5B). Intermediate appendages heavily sclerotized, rod-like, moderately elongate, only half as long as preanal appendages, acute apically ( Figs. 5 A, 5B). Preanal appendages elongate, as long as tergum X, rod-like, not greatly modified; apex rounded, with short, stout spine-like setae ( Figs. 5 A, 5B). Inferior appendages robust, setose; each with 1st article, in lateral view, approximately as long as wide; 2nd article shorter than 1st article, slightly narrow than 1st article; apex truncate, with short, stiff apicomesal setae ( Figs. 5 A, 5C). Phallobase tubular, short, weakly curved at base; endotheca without evident spines or phallotremal sclerites ( Fig. 5 D).

Holotype male: BRAZIL: Espírito Santo: Santa Teresa, Estação Biológica de Santa Lúcia, Córrego Bonito, above Cachoeira Heloísa Torres, 19°58’25.9”S, 40°31’46.3”W, el. 685 m, 03.iv.2011, LL Dumas & GA Jardim leg. (DZRJ 3483).

Paratypes: Same data as holotype, 4 males, 1 female (DZRJ 3484).

Distribution: Brazil (Espírito Santo state).

Etymology: The epithet of the specific name, capixaba , refers to Espírito Santo, the southeastern Brazilian state where the type specimens were collected. “Kapixaba”, from the Tupi language, means “field land,” in allusion to corn and mandioca fields cultivated by local Indian tribes, and also refers to the natives of Espírito Santo state.

Figures

FIGURE 5. Alterosa capixaba, new species, male genitalia. 5 A, left lateral view; 5 B, dorsal view; 5 C, left inferior appendage, dorsal view; 5 D, phallic apparatus, left lateral view.