Alterosa beckeri, Blahnik Table Of Contents, 2005

Blahnik Table Of Contents, Roger J., 2005, Alterosa, a new caddisfly genus from Brazil (Trichoptera: Philopotamidae), Zootaxa 991 (1), pp. 1-60 : 14

Alterosa beckeri , new species

Fig. 5A–D

This species is most similar to A. boraceiae . It resembles that species in having elongate, apically setose, intermediate appendages, branched near the base. It differs in having the lateral branches of the intermediate appendages more elongate, in lacking paired longitudinal ridges of short spines on tergum X, and in having preanal appendages more elongate and rod­like.

Adult. Color overall, dark brown; legs, palps, and antennae slightly paler, wings irregularly mottled with small light brown spots. Male forewing 8 mm.

Male genitalia. Tergum VIII with posteromesal margin deeply emarginate, emargination V­shaped and extending more than half way to anterior margin. Sternum IX with anterolateral margin weakly rounded, subtruncate; posteroventral margin greatly produced, forming broadly rounded expansion; tergum IX greatly reduced, membranous or fused to base of tergum X. Tergum X narrow, lateral margin gradually narrowing to apex, basolaterally with small rounded protuberance; apex sensillate, subacute as viewed dorsally, rounded and distinctly enlarged in lateral view; tergum textured basolaterally, with scabrous cuticle and numerous small adpressed scale­like spines. Intermediate appendage heavily sclerotized, elongate, extending past preanal appendages, branched basally, forming elongate rod­like mesal branch, nearly as long as tergum X, and shorter lateral branch (about half as long), both branches with numerous fine microsetae on lateral margin; apices of both branches subacute, with brush of coarse setae. Preanal appendage narrow, rodlike, only weakly constricted basally, elongate, with scant setae and numerous minute setalike spines; apex rounded, with weak brush of short stiff setae. Inferior appendages elongate, linear, flattened on mesal surface; 1st article, in lateral view, narrow, about 3 times longer than wide, tapering apically; 2nd article shorter than 1st, nearly uniform in width, only slightly narrower at base than apex of 1st article; apex rounded, with small pad of short, stiff apicomesal setae. Phallobase tubular, narrow, moderately elongate, weakly, angularly bent near middle, narrowing apically; endotheca with tract of numerous very short spines.

Holotype male: BRAZIL: Rio de Janeiro: Itatiaia , 2100 m, 25.i.1993, V. O. Becker ( UMSP000204557 ) ( MZUSP).

Etymology. This species is named after the eminent lepidopterist, Vitor Becker, who collected and pinned the holotype.

Figures

FIGURE 5. Alterosa beckeri, new species. Male genitalia: 5A—lateral view; 5B—dorsal view of segments IX and X; 5C—inferior appendage, dorsal view; 5D—phallic apparatus, lateral view.