Alterosa escova, 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 : 21

Alterosa escova , new species

Fig. 9A–D

This species is similar to Alterosa fluminensis , A. flinti , A. marinonii and A. sanctaeteresae , all of which have similarly developed inferior appendages and highly modified and enlarged preanal appendages armed with spine­like setae. From A. flinti and A. sanctaeteresae it differs in lacking elongate, apically setose lateral branches from the intermediate appendages. From A. marinonii and A. fluminensis it differs in the armature of the preanal appendages, which in A. escova is brush­like and confined to the posterolateral margin of the appendage.

Adult. Color overall, dark brown; legs, palps, and antennae slightly paler, wings irregularly mottled with small light brown spots. Male forewing 6–6.7 mm.

Male genitalia. Tergum VIII with posteromesal margin slightly emarginate. Sternum IX with anterolateral margin broadly rounded; posteroventral margin greatly produced, extending sinuously from dorsum; tergum IX greatly reduced, membranous or fused to base of tergum X. Tergum X tapered from base, slightly expanded at midlength; apex sensillate, rounded as viewed dorsally, not or scarcely enlarged in lateral view. Intermediate appendage heavily sclerotized, moderately elongate, more or less spine­like and weakly scabrous, with scale­like spines along dorsolateral margin; apex acute. Preanal appendage greatly enlarged, wider at base than apex, elongate, with short, stout setae apically, extending along ventromesal margin; apex rounded; preanal appendage basally with flange­like process bearing cluster of prominent, stalked, spine­like setae, flange­like process large, rounded, with stout apicomarginal setae, mesal to appendage itself. Inferior appendages robust; 1st article, in lateral view, short, nearly as wide as long, bulging mesally; 2nd article longer than 1st article, relatively wide and uniform in width, about as wide basally as apex of 1st article; apex rounded, with prominent pad of short, stiff apicomesal setae. Phallobase tubular, relatively short and wide, slightly curved dorsally; endotheca relatively short, with numerous short spines, apparently in several paired tracts, basolateral ones very short.

Holotype male: BRAZIL: São Paulo: small stream on São Paulo Route 247, 11 km SE Bananal, 22°45.684'S, 44°23.190'W, el 675 m, 23.ix.2002, Blahnik, Prather, Melo, Froehlich, Silva, ( UMSP000088791 ) ( MZUSP).

Paratypes: BRAZIL: Rio de Janeiro: — 1 male, Parque Nacional Itatiaia, Rio Taquaral , 22°27.252'S, 44°36.570'W, el 1300 m, 22–23.xi.2001, Holzenthal, Blahnik, ( NMNH) ; — 1 male, Parque Nacional Itatiaia, trib. to Rio Taquaral , 22°26.688'S, 44°36.464'W, el 1320 m, 6.iii.2002, Holzenthal, Blahnik, Prather, ( UMSP) .

Etymology. This species is named escova , from the Portuguese word for brush, referring to the somewhat brush­like preanal appendages of this species. The word is used as a noun in apposition.

Figures

FIGURE 9. Alterosa escova, new species. Male genitalia: 9A—lateral view; 9B—dorsal view of segments IX and X; 9C—inferior appendage, dorsal view; 9D—phallic apparatus, lateral view.