Alterosa holzenthali, 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 : 32

publication ID 10.11646/zootaxa.991.1.1


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scientific name

Alterosa holzenthali

new species

Alterosa holzenthali , new species

Fig. 15A–D View FIGURE 15

This species differs from all other species of Alterosa in the laterally spinose and projecting posterior margin of tergum IX. The narrow pencil­like intermediate appendage, which closely parallels the lateral margin of tergum X and terminates with a stout apical seta, is similar only to A. paprockii .

Adult. Color overall, dark brown; legs, palps, and antennae slightly paler, wings irregularly mottled with small light brown spots. Male forewing 5–5.2 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 angularly truncate; posteroventral margin moderately produced, extending sinuously from dorsum; tergum IX forming a shelf­like projection over base of tergum X, shelf with apicomesal invagination, lateral and ventrolateral margins with numerous short stiff spines, few spines also present basomesally. Tergum X tapered from base; apex sensillate, slightly enlarged and rounded as viewed dorsally, not or scarcely enlarged in lateral view. Intermediate appendage weakly sclerotized, elongate, extending past preanal appendages, appendage narrow, pencil­like, closely adpressed to lateral margin of tergum X; apex acute, terminating in apical spine­like seta, seta short. Preanal appendage narrow, constricted basally, elongate, with scant setae and numerous minute seta­like spines; apex acuminate, with distinct terminal seta. Inferior appendages elongate, linear, flattened on mesal surface; 1st article, in lateral view, about one and a half times longer than wide, tapering apically; 2nd article longer than 1st article, relatively narrow and uniform in width; apex rounded, with small pad of short, stiff apicomesal setae. Phallobase sinuously bent at midlength; endotheca without spines.

Holotype male: BRAZIL: Santa Catarina: Parque Ecológica Spitzkopf, confluence Rio Ouro & Rio Caeté , 27°00.352'S, 49°06.693'W, el 140 m, 3.iii.1998, Holzenthal, Froehlich, Paprocki, ( UMSP000033074 View Materials ) ( MZUSP). GoogleMaps

Paratype: BRAZIL: Santa Catarina: — 1 male, Parque Ecológica Spitzkopf, Rio Caeté above 1st falls, 27°00.35'S, 49°06.70'W, el 170 m, 4.iii.1998, Holzenthal, Froehlich, Paprocki, ( UMSP) GoogleMaps .

Etymology. I am pleased to name this species for my friend and colleague, Dr. Ralph W. Holzenthal, not only for collecting the type specimens, but also for his outstanding contributions to the study of Neotropical caddisflies.


Museu de Zoologia da Universidade de Sao Paulo


University of Minnesota Insect Collection