AbstractWe describe a new species of giant crab spider of the genusSadalaSimon, 1880 collected in Lowland Evergreen rainforests at the Tiputini Biodiversity Station, Yasuni Biosphere Reserve, Amazonian Ecuador. This new species corresponds to the first record of the genus from Ecuador. Females of the new species ofSadalaare similar toS. puniceaandS.nanay, by having the epigyne with a median septum diamond‐shaped posteriorly. The new species is easily distinguished fromS. puniceaandS.nanayby having relatively straight anterior lateral margins of the median septum. This study increases to 10 the number of described species ofSadala.