Alterosa fluminensis, 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: 28-30

publication ID 10.11646/zootaxa.991.1.1


persistent identifier

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scientific name

Alterosa fluminensis

new species

Alterosa fluminensis   , new species

Fig. 13A–E View FIGURE 13

This species is similar to Alterosa escova   , 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. escova   and A. marinonii   it differs in the shape and armature of the preanal appendage, which in A. fluminensis   possesses a basal pad with elongate, stalked setae, in addition to apical and mesolateral setae. Alterosa fluminensis   is also unique in possessing a small, stalked basal process at the base of tergum X, although the latter structure may not always be present.

Adult. Color overall, dark brown; legs, palps and antennae slightly paler, wings irregularly mottled with small light brown spots. Male forewing 5.2–6 mm.

Male genitalia. Tergum VIII with posteromesal margin not or scarcely emarginate. Sternum IX with anterolateral margin broadly rounded; posteroventral margin greatly produced, extending sinuously from dorsum; tergum IX reduced, forming a mesal projection over base of tergum X, mesal projection extending into short mesal stalk, terminating with small bulbous, apically setose process (stalked process broken in holotype specimen, but present with specimen; apparently undeveloped in paratype specimen). Tergum X tapered from base, in lateral profile undulate; apex sensillate, subacute as viewed dorsally, rounded and slightly enlarged in lateral view. Intermediate appendage heavily sclerotized, moderately elongate, spine­like; apex acute. Preanal appendage greatly enlarged, broad basally, 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 small, rounded, more or less ventral and 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 broad and nearly uniform in width; apex rounded, with prominent pad of short, stiff apicomesal setae. Phallobase tubular, relatively short, narrow basally, expanded apically, rather sharply bent at midlength; endotheca with numerous short tack­like spines.

Holotype male: BRAZIL: Rio de Janeiro: Rio Sousa in Cachoeiras de Macacú , 26°26.567'S, 42°37.957'W, el 150 m, 16.iii.1996, Holzenthal, Rochetti, Oliveira, ( UMSP000035880 View Materials ) ( MZUSP). GoogleMaps  

Paratype: BRAZIL: Rio de Janeiro: — 1 male, Km 54, 26 km E of Nova Friburgo, 410m, 19.iv.1977, C. M. & O. S. Flint, Jr., ( NMNH)   .

Etymology. This species is named fluminensis   from the Latin word for stream, and referring to the state of Rio de Janeiro where the type specimens were collected.


Museu de Zoologia da Universidade de Sao Paulo


Smithsonian Institution, National Museum of Natural History