Alterosa boraceiae, 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 : 17-19

publication ID 10.11646/zootaxa.991.1.1

persistent identifier

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scientific name

Alterosa boraceiae

new species

Alterosa boraceiae , new species

Fig. 7A–D View FIGURE 7

This species is most similar to A. beckeri and resembles that species in having elongate, basally branched intermediate appendages, each with an apical brush. It differs from A. beckeri in that the lateral branches of the intermediate appendage are shorter, and in having paired longitudinal ridges of spines on tergum X. The preanal appendage is also less modified and has a single apical seta, rather than a weak brush of setae.

Adult. Color overall, dark brown; legs, palps, and antennae slightly paler, wings irregularly mottled with small light brown spots. Male forewing 6.2–6.8 mm.; female 7.1 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 with basolateral margins rounded, tapering apically; dorsally with mesally paired, longitudinal rows of short spines, converging apically; apex sensillate, subacute as viewed dorsally, rounded and distinctly enlarged in lateral view; tergum textured basolaterally, with scabrous cuticle. Intermediate appendage heavily sclero­ tized, elongate, extending past preanal appendages, branched basally, lateral branch very short, mesal branch elongate, rod­like; apices of both branches rounded, with brush of coarse setae. Preanal appendage narrow, constricted basally, moderately elongate, not greatly modified, with scant setae and numerous minute seta­like spines; apex abruptly narrowed, forming subacuminate projection, with distinct terminal seta. Inferior appendages elongate, linear, flattened on mesal surface; 1st article, in lateral view, narrow, more than 2x as long as wide, tapering apically; 2nd article shorter than 1st, scarcely narrower at base than apex of 1st article; apex rounded, with small pad of short, stiff apicomesal setae. Phallobase tubular, relatively short, narrowing apically, slightly curved; endotheca with paired clusters of short spines.

Holotype male: BRAZIL: São Paulo: Estação Biológica Boraceia, Rio Venerando & tribs., 23°39.185'S, 45°53.414'W, el 850 m, 18–20.iv.1998, Holzenthal, Melo, Froehlich, ( UMSP000033080 View Materials ) ( MZUSP). GoogleMaps

Paratypes: BRAZIL: São Paulo: — 1 male, 1 female, same locality data as holotype ( UMSP) ; — 2 males, 2 females, Estacion Biológica Boraceia, Rio Venerando , 850 m, 3.iv.1977, C. M. & O. S. Flint, Jr., ( NMNH) .

Etymology. This species is named boraceiae for the nearly pristine and beautiful nature preserve, Estação Biológica Boraceia, maintained by the Museum of Zoology of the University of São Paulo.


Museu de Zoologia da Universidade de Sao Paulo


University of Minnesota Insect Collection


Smithsonian Institution, National Museum of Natural History