Alterosa truncata, 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 : 51-53

publication ID 10.11646/zootaxa.991.1.1

persistent identifier

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scientific name

Alterosa truncata

new species

Alterosa truncata , new species

Fig. 26A–E View FIGURE 26

This species is similar only to A. schadrackorum in having the apices of the inferior appendages broadened and truncate, but in A. truncata they are much more distinctly so. The relative lengths of the articles of the inferior appendages, as well as the overall structure of the genitalia of these two species are otherwise entirely dissimilar. An additional diagnostically unique character for A. truncata is the structure of the intermediate appendages, which are elongate, narrow, and arched, each terminating in a very prominent apical lance­like seta. There is some minor variation among populations in the structure of tergum X, as shown in Fig. 26A and 26E View FIGURE 26 .

Adult. Color overall, dark brown; legs, palps, and antennae slightly paler, wings irregularly mottled with small light brown spots. Male forewing 5.5–7 mm.; female 6.1–7 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 broadly rounded; posteroventral margin greatly produced, forming broadly rounded expansion; tergum IX greatly reduced, membranous or fused to base of tergum X. Tergum X narrow, lateral margins subparallel; dorsally with mesally divided crest­like projection near base, with spine­like projections along each side of divided margin, apex of crest either undulate or serrate; apex sensillate, rounded as viewed dorsally, rounded and slightly enlarged in lateral view, or with angular preapical projection. Intermediate appendage heavily sclerotized, elongate, extending past preanal appendages, narrow rod­like, but with strong basal curvature, narrowly paralleling lateral margins of tergum X; apex acute, terminating in apical spine­like seta, seta prominent, lance­like. Preanal appendage narrow, constricted basally, moderately elongate, not greatly modified, with scant setae and numerous minute seta­like spines; apex rounded, without apical seta, but frequently with 1 or 2 short, blunt, preapical projections from the ventral surface, fringed apically with minute spines. Inferior appendages elongate, linear, flattened on mesal surface; 1st article, in lateral view, about 2x as long as wide, tapering apically; 2nd article subequal in length to 1st article, moderately wide, nearly as wide at base as apex of 1st article; apex enlarged and subtruncate, with fringing pad of short, stiff apicomesal setae. Phallobase tubular, narrow, moderately elongate, with moderate basal inflection and slight curvature; endotheca with 2 obvious tracts of fine spines, one of longer needle­like spines and the other (ventral) of paired patches of shorter spines.

Holotype male: BRAZIL: Minas Gerais: Estação Ecológica de Peti, Córrego Brucutu, 19°52.995'S, 43°22.452W, 17.xi.1998, Paprocki , Amarante , ( UMSP000046574 View Materials ) ( MZUSP). GoogleMaps

Paratypes: BRAZIL: Minas Gerais: — 1 male, same locality data as holotype, ( UMSP) ; — 2 males, Rio Mainarte, bridge on Cibrão road, 20°27'258'S, 43°24.094'W, el 700 m, 19.ix.1998, Paprocki, Amarante, ( MZUSP) ; — 2 males, 2 females, Parque Nacional do Caparaó, Rio Caparaó at Vale Verde , 20°25.029'S, 41°50.767'W, el 1350 m, 12– 13.iii.2002, Holzenthal, Blahnik, Paprocki, Prather, ( UMSP) GoogleMaps ; São Paulo: — 1 male, 3 females, Cachoeira do Paredão, Lajeado, Serra do Bocaina , 22°43.533'S, 44°37.274'W, el 1550 m, Holzenthal, Blahnik, Paprocki, Prather, ( MZUSP) GoogleMaps ; — 3 males, Cachoeira do Principe, Lajeado, Serra do Bocaina , 22°49.913'S, 44°37.418'S, el 1560 m, 4.iii.2002, Holzenthal, Blahnik, Paprocki, Prather, ( UMSP) ; — 1 male, Parque Nacional da Serra da Bocaina , small tributary on main park road, 22°46.585'S, 44°36.307'W, el 1560 m, 2– 3.iii.2002, Holzenthal, Blahnik, Paprocki, Prather, ( UMSP) GoogleMaps ; — 1 male, Estacion Biológica Boraceia, Ribeirão Venerando , 26.i.1974, Froehlich, ( NMNH) ; — 1 male, Casa Grande, Pedeira , 15.xi.1974, C. G. Froehlich, ( NMNH) .

Etymology. This species is named truncata for its diagnostic, apically flattened and truncate inferior appendages.


Museu de Zoologia da Universidade de Sao Paulo


University of Minnesota Insect Collection


Smithsonian Institution, National Museum of Natural History