Alterosa guapimirim, 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: 30-32

publication ID 10.11646/zootaxa.991.1.1

persistent identifier

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scientific name

Alterosa guapimirim

new species

Alterosa guapimirim   , new species

Fig. 14A–D View FIGURE 14

This species is very similar to A. orgaosensis   and it is possible that the two may eventually prove to be not specifically distinct. It resembles that species in having an inferior appendage with a very short 2nd article, tergum X with a large, inflated apex and a basolateral margin that is peculiarly cupped. Additionally, the apices of the preanal appendages of both species are unusual in being concavely cupped, each bearing a thick spine­like seta. The two species differ primarily in the structure of the intermediate appendage, which is apically rounded and setose in A. guapimirim   and concave and armed much like the preanal appendage in A. orgaosensis   . Additionally, tergum X is more distinctly dome­shaped in A. orgaosensis   .

Adult. Color (in alcohol) brown; legs, palps, and antennae distinctly pale, wing pattern not discernable, but costal margin with some paler areas. Male forewing 6.2–6.9 mm.

Male genitalia. Tergum VIII with posteromesal margin not or scarcely emarginate. Sternum IX with anterolateral margin forming a rounded projection in dorsal half; posteroventral margin moderately produced, forming broadly rounded expansion; tergum IX forming a shelf­like projection over base of tergum X, projection prominent, apex as viewed dorsally, rounded, subspatulate. Tergum X with lateral margins subparallel; dorsally with elevated longitudinal mesal ridge; apex sensillate, forming greatly enlarged expansion in apical half, rounded and distinctly enlarged in lateral view; tergum basolaterally with short, setose, apically­rounded projection, set in a large, sclerotized concave depression. Intermediate appendage heavily sclerotized, shorter than preanal appendage, rod­like and mesally curved; apex rounded, slightly expanded, with small number of apical spines. Preanal appendage narrow, sinuous, with apex projecting outward, elongate, with scant setae on lateral margin; apex rounded, with distinct terminal seta; in oblique concavity, seta stout and spine­like. Inferior appendages elongate, linear, flattened on mesal surface; 1st article, in lateral view, more than 2x as long as wide, tapering apically; 2nd article shorter than 1st, (less than half the length), nearly as wide at base as apex of 1st article, more or less uniform in width; apex rounded, with small pad of short, stiff apicomesal setae. Phallobase tubular, moderately elongate, strongly curved near middle; endotheca with 4 large spines in 2 pairs, dorsal ones slightly curved; internally with appar­ ent pair of elongate, curved spines (actually probably sclerotized margins of a somewhat trough­shaped phallotremal sclerite).

Holotype male: BRAZIL: Rio de Janeiro: Parque Nacional da Serra dos Orgãos, Guapimirim , Trilha das Ruinas, 22°29.679'S, 42°59.729'W, el 940 m, 28.ii.2002, Blahnik & Paprocki, ( UMSP000083754 View Materials ) ( MZUSP). GoogleMaps  

Paratypes: BRAZIL: Rio de Janeiro: — 3 males, same locality data as holotype ( UMSP) ( NMNH)   .

Etymology. This species is named guapimirim   , using the word as a noun in apposition, referring to the name of the section in Parque Nacional da Serra dos Orgãos where the type specimens were collected.


Museu de Zoologia da Universidade de Sao Paulo


University of Minnesota Insect Collection


Smithsonian Institution, National Museum of Natural History