Alterosa caissara, 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 caissara , new species

Figs. 4 A–D

Alterosa caissara sp. nov. probably belongs to the A. sanctipauli Group, as defined by Blahnik (2005), by sharing structures on tergum X, like the apically crest-like process, the presence of mesal serrate longitudinal ridges and the scabrous cuticle basolaterally (although it is not developed into a protuberance). It most resembles A. caparaonensis Blahnik 2005 in the shape of tergum X and the general structure of intermediate appendages. Nevertheless, the new species can be easily separated from it by the different shape of the intermediate appendages, which are branched basally, with the mesal branch positioned below the lateral branch, both covered by modified long, stout spine-like setae. Additionally, the small needle-like endothecal spines in the phallus in A. caissara sp. nov. can be used to separate it from A. caparaonensis , which has the endotheca spineless.

Adult. Color (in alcohol) brown; legs, palps, and antennae pale brown, forewing pattern not discernible, but costal margins with some paler areas. Male forewings each 6.4 mm (n=1).

Male genitalia. Tergum VIII with posteromesal margin deeply emarginate, this emargination V-shaped and extending more than halfway to anterior margin. Sternum IX with anterolateral margin broadly rounded; posteroventral margin greatly produced, forming broadly rounded expansion ( Fig. 4 A). Tergum IX reduced, forming small subrectangular plate over base of tergum X, partially fused to tergum X ( Fig. 4 B). Tergum X greatly enlarged at base, abruptly narrowing to apex from apical half; tergum basolaterally with small area of scabrous cuticle; dorsally with mesally longitudinal ridge bearing 2–4 spines and paired, longitudinal rows of short spines; apex sensillate, rounded, with longitudinal crest-like process as viewed dorsally, rounded and moderately enlarged in lateral view ( Figs. 4 A, 4B). Intermediate appendages heavily sclerotized, elongate, extending past preanal appendages, branched basally, both branches rod-like, subacute apically, covered by several stout, spine-like setae; mesal branch positioned below lateral branch; lateral branch surpassing mesal branch ( Figs. 4 A, 4B). Preanal appendages twisted and slightly constricted basally, club-like, not greatly modified, with scant, small setae; each with apex rounded ( Figs. 4 A, 4B). Inferior appendages elongate, linear, setose; each with 1st article, in lateral view, approximately 2.5 times as long as wide; 2nd article shorter than 1st article, base nearly as wide as apex of 1st article, scarcely narrowed at midlength; apex rounded, with small pad of short, stiff apicomesal setae ( Figs. 4 A, 4C). Phallobase tubular, short, moderately curved in middle; endotheca with cluster of small, needle-like spines; phallotremal sclerites indistinct ( Fig. 4 D).

Holotype male: BRAZIL: São Paulo: Ubatuba, Parque Estadual da Serra do Mar, Núcleo Picinguaba, Km 2 of BR 101 road, small tributary, near Cachoeira da Escada, 23°21’14.5”S, 44°46’03.8”W, el. 296 m, 04.vi.2011, JL Nessimian & AL Henriques-Oliveira leg. (DZRJ 3482).

Paratype: BRAZIL: São Paulo: same locality, 09.ix.2011, LL Dumas & BHL Sampaio leg., 1 male (DZRJ 3506).

Distribution: Brazil (São Paulo state).

Etymology: This species is named caissara in allusion to the region in which the holotype specimen was collected, near the sea. “Caiçara” is a term from the Tupi native Brazilian ancient language, and has been used to designate the traditional coastal communities of southeastern Brazil.

Figures

FIGURE 4. Alterosa caissara, new species, male genitalia. 4 A, left lateral view; 4 B, dorsal view (right lateral branch of intermediate appendage omitted); 4 C, left inferior appendage, dorsal view; 4 D, phallic apparatus, left lateral view.