ABSTRACT. We described a new species of spider, Alpaida clarindoi sp. nov. (Araneidae), from the southwestern Amazon forest. The new species is distinguished from most Alpaida by the presence of a pair of shoulders spines. Females can be separated from similar species by the subquadrangular shape of the epigynum, and males by the shape of the terminal apophysis and the tegulum, which possess an apical pointed tip. Alpaida clarindoi sp. nov. is described based on both sexes.KEYWORDS. Spiders, Arachnida, Taxonomy, Neotropical Region.RESUMO. Nova espécie de Alpaida (Araneae, Araneidae) de Rondônia, Brasil. Nós descrevemos uma nova espécie de aranha, Alpaida clarindoi sp. nov. (Araneidae), da região sudoeste da floresta amazônica. A nova espécie se distingue das demais pela presença de um par de espinhos dorsais na parte anterior do abdome. A fêmea difere de espécies semelhantes pelo formato subquadrangular do epígino, e o macho pelo formato da apófise terminal e do tegulum, que possui um espinho apical na borda. Alpaida clarindoi sp. nov. é descrita com base em exemplares de ambos os sexos.
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