Abstract
Ten new species of the orb-weaving spider genus Alpaida O. Pickard-Cambridge, 1889 are described from Espírito Santo, Minas Gerais, and Rio de Janeiro states, Brazil: Alpaida batman sp. nov., A. capixaba sp. nov., A. linhares sp. nov., and A. sooretama sp. nov. come from Sooretama and Linhares (Espírito Santo state), while A. jequitiba sp. nov. from Parque Estadual dos Três Picos (Cachoeiras de Macacu), A. coati sp. nov. and A. serrana sp. nov., both from Parque Nacional da Serra dos Órgãos (Teresópolis), A. regua sp. nov. from Reserva Ecológica de Guapiaçu (REGUA, Cachoeiras de Macacu), and A. taquara from Parque Estadual da Pedra Branca (PEPB) and Ilha do Fundão (both Rio de Janeiro city), are all from Rio de Janeiro state. Alpaida pretiosa sp. nov. is found in all three states: Sooretama and Linhares (Espírito Santo state), Reserva União (Cachoeiras de Macacu, Rio de Janeiro state), and in Viçosa (Minas Gerais state). Additionally, we correct the mismatching of one of our males with females of another species from the literature, and expand the distribution of A. mendensis Baptista, Castanheira & Prado, 2018.