Alterosa flinti, 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: 26-28

publication ID 10.11646/zootaxa.991.1.1

persistent identifier

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scientific name

Alterosa flinti

new species

Alterosa flinti   , new species

Fig. 12A–D View FIGURE 12

This species is similar to Alterosa escova   , A. fluminensis   , 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 all except A. sanctaeteresae   it differs in possessing elongate, apically setose lateral branches from the intermediate appendages. It differs from A. sanctaeteresae   in the unusual shape of the preanal appendage, which in A. flinti   has a greatly enlarged, rounded dorsal lobe.

Adult. Color overall, dark brown; legs, palps, and antennae slightly paler, wings irregularly mottled with small light brown spots. Male forewing 5.5–5.9 mm.; female 5.7 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 broadly rounded; posteroventral margin greatly produced, extending sinuously from dorsum; tergum IX reduced, forming a mesal projection over base of tergum X. Tergum X with lateral margins rounded basally, subparallel apically; apex sensillate, rounded as viewed dorsally, not or scarcely enlarged in lateral view. Intermediate appendage heavily sclerotized, elongate, extending past preanal appendages, branched basally, both branches rod­like, mesal branch much shorter, with acuminate apex, lateral branch with apex subacute; with brush of short, stiff setae. Preanal append­ age short, bulbous, forming rounded, laterally compressed structure with coarse, stalked, spine­like setae on posterior margin, ventrally situated setae on slightly emergent process, constricted basally. Inferior appendages robust; 1st article, in lateral view, about one and a half times longer than wide, bulging mesally; 2nd article subequal in length to 1st article, relatively wide, apex enlarged; apex rounded, with prominent pad of short, stiff apicomesal setae. Phallobase tubular, moderately elongate, sinuously flexed in basal and apical third; endotheca with basal tract of about 4 nail­like spines and apical tract of numerous smaller tack­like spines.

Holotype male: BRAZIL: Espirito Santo: 24 km SE Santa Teresa , el 280 m, 22.iv.1977, C.M. & O.S Flint, Jr., ( UMSP000204550 View Materials ) ( MZUSP).  

Paratypes: BRAZIL: Espirito Santo: — 3 males, same locality data as holotype ( NMNH) ( UMSP)   ; Rio de Janeiro: — 1 male, 1 female, Km 17, 8 km S of Teresopolis , 18–19.iv.1977, C.M. & O.S. Flint, Jr., ( NMNH)   .

Etymology. I take great pleasure in naming this species for Dr. Oliver S. Flint, Jr., the eminent trichopterist who devoted his career to the study of Neotropical caddisflies and who collected the type specimens.


Museu de Zoologia da Universidade de Sao Paulo


Smithsonian Institution, National Museum of Natural History


University of Minnesota Insect Collection