Abstract
The genus Alterosa Blahnik (2005)Blahnik, R.J. 2005. Alterosa, a new caddisfly genus from Brazil (Trichoptera: Philopotamidae). Zootaxa, 991: 1-60., with 39 extant species, is endemic to Atlantic Forest areas of southern and southeastern Brazil. Herein, we describe and illustrate two new species from Rio de Janeiro state, southeastern Brazil: Alterosa cornuta sp. nov., easily diagnosed by the horn-like intermediate appendages crossing each other, and A. araras sp. nov., recognized mainly by the extremely developed basodorsal protuberance on tergum X and by the rod-like, mesally curved preanal appendages, with at least 2 stout spine-like setae positioned at mid length and with the apex cupped. Additionally, a new distributional record for Espírito Santo state, southeastern Brazil, is provided for Alterosa falcata Blahnik (2005)Blahnik, R.J. 2005. Alterosa, a new caddisfly genus from Brazil (Trichoptera: Philopotamidae). Zootaxa, 991: 1-60..
Key-Words.
Atlantic Forest; Distributional notes; Finger-net caddisflies; Neotropics; Taxonomy
