Alterosa itatiaiae, 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 : 35-37

publication ID 10.11646/zootaxa.991.1.1

persistent identifier

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scientific name

Alterosa itatiaiae

new species

Alterosa itatiaiae , new species

Fig. 17A–E View FIGURE 17

This species is probably most similar to A. intervales , but differs from that species, and others having a tergum X with a scabrous basal protrusion, in the highly modified and unique structure of the preanal and intermediate appendages. The preanal appendages of A. itatiaiae are thick and stout and bear an apical brush of setae, and the intermediate appendages have a linear array of coarse setae on a longitudinal apicolateral fold. The scabrous basal protrusions of tergum X are also more strongly developed than in any other species of Alterosa .

Adult. Color overall, dark brown; legs, palps, and antennae slightly paler, wings irregularly mottled with small light brown spots. Male forewing 7–8.3 mm.; female 8 mm.

Male genitalia. Tergum VIII with posteromesal margin moderately emarginate, emargination V­shaped and extending no more than halfway to anterior margin. Sternum IX with anterolateral margin weakly rounded, subtruncate; posteroventral margin greatly produced, extending nearly linearly from dorsum; tergum IX greatly reduced, membranous or fused to base of tergum X. Tergum X with rounded lateral margins, forming elevate lateral projections; dorsally with mesally paired longitudinal ridges, each apically lined with short spines, appearing as apparent mesal invagination; apex sensillate, subtruncate as viewed dorsally, rounded and slightly enlarged in lateral view; tergum textured basolaterally, with scabrous cuticle and numerous small adpressed scale­like spines. Intermediate appendage heavily sclerotized, elongate, subequal in length to preanal appendage, narrow at base and gradually expanding apically, with row of thickened setae in lateral cleft on apical half; apex rounded. Preanal appendage narrow, only weakly constricted basally, elongate, with scant setae and numerous minute seta­like spines; apex rounded, with brush of numerous thickened setae. Inferior appendages elongate, linear, flattened on mesal surface; 1st article, in lateral view, about 2x as long as wide, tapering apically; 2nd article shorter than 1st, nearly uniform in width, narrower at base than apex of 2nd article; apex rounded, with small pad of short, stiff apicomesal setae. Phallobase tubular, relatively short and wide, slightly curved; endotheca with about 4 pairs of short tack­like spines basoventrally (as seen with endotheca extended), preapically with paired tracts of fine spines, extending more or less linearly from venter onto apicolateral pleats, dorsally with sack­like projection at about midlength.

Holotype male: BRAZIL: Rio de Janeiro: Parque Nacional Itatiaia, Rio Campo Belo, trail to Veu da Noiva , 22°25.706'S, 44°37.171'W, el 1310 m, 24.xi.2001, Holzenthal, Paprocki, Blahnik, Neto, ( UMSP000080369 View Materials ) ( MZUSP) GoogleMaps

Paratypes: BRAZIL: Rio de Janeiro: — 11 males, 1 female, same locality data as holotype ( MZUSP) ( UMSP) ; — 1 male, same locality, 5.iii.2002, Holzenthal, Blahnik, Paprocki, Prather, ( NMNH) ; — 5 males, 1 female, same locality, 5.iii.2002, Holzenthal, Blahnik, Paprocki, Prather, ( UMSP) ; — 2 males, Parque Nacional Itatiaia, Rio Campo Belo , 22°27.033'S, 44°36.818'W, el 1300 m, 23.xi.2001, Holzenthal, Paprocki, Blahnik, Neto, ( NMNH) GoogleMaps ; — 2 males, Rio de Janeiro, Parque Nacional Itatiaia, trib. to Rio Taquaral , 22°26.688'S, 44°36.464'W, el 1320 m, 6.iii.2002, Holzenthal, Blahnik, Prather, ( MZUSP) GoogleMaps . Etymology. This species is named itatiaiae for Parque Nacional do Itatiaia , the very beautiful Atlantic tropical rainforest site 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