Alterosa intervales, 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: 33-35

publication ID 10.11646/zootaxa.991.1.1


persistent identifier

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scientific name

Alterosa intervales

new species

Alterosa intervales   , new species

Fig. 16A–D View FIGURE 16

Alterosa intervales   is similar to A. sanctipauli   , resembling that species in the elongate, narrow, unbranched intermediate appendages. It differs in that the setae of the intermediate appendage in A. intervales   are very elongate and located along the apicolateral margin, while those in A. sanctipauli   are very short and terminal. Alterosa intervales   also differs from A. sanctipauli   in the shape of the apex of tergum X and presence of paired, spined longitudinal ridges found on the same structure.

Adult. Color overall, dark brown; legs, palps, and antennae slightly paler, wings irregularly mottled with small light brown spots. Male forewing 7–7.3 mm.; female 6.8–7 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 forming a rounded projection in dorsal half; 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, rounded as viewed dorsally, subtruncate in lateral view; tergum textured basolaterally, with scabrous cuticle. Intermediate appendage heavily sclerotized, elongate, extending past preanal appendages, rod­like, curved near base; apex acute, with linear, preapical row of about four elongate spine­like setae. Preanal appendage narrow, constricted basally, moderately elongate, not greatly modified, with scant setae and numerous minute seta­like spines; apex rounded, with distinct terminal seta. Inferior appendages elongate, linear, flattened on mesal surface; 1st article, in lateral view, narrow, about 3x longer than wide, tapering apically; 2nd article subequal in length to 1st article, 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, short, scarcely curved; endotheca with numerous fine spines in several distinct, paired tracts near base, apex elongate, without spines.

Holotype male: BRAZIL: São Paulo: Parque Estadual Intervales, small trib. to Agua Comprida , 24°16.531'S, 48°25.042'W, el 800 m, 01.x.2002, Blahnik & Prather, ( UMSP000088786 View Materials ) ( MZUSP). GoogleMaps  

Paratypes: BRAZIL: São Paulo: — 1 male, 3 females, same collection data as holotype ( UMSP) ( MZUSP) GoogleMaps   .

Etymology. This species is named intervales   , used as a noun in apposition, for Parque Estadual Intervales, the very beautiful park where the type specimens were collected.


Museu de Zoologia da Universidade de Sao Paulo


University of Minnesota Insect Collection