Taczanowskia yasuni new species: A new enigmatic species of spider (Araneidae) from the Ecuadorian Amazon canopy Author Díaz-Guevara, David R. Instituto Nacional de Biodiversidad INABIO, Quito, Ecuador & Fundación Arañas Tropicales - ArachnoTrAC, Bogotá, Colombia & Fundación Uru, Quito, Ecuador Author Macías-Tulcán, Mauricio Universidad de Especialidades Espíritu Santo, km 2.5 vía Samborondón, Guayas, Ecuador & Fundación Uru, Quito, Ecuador Author Galvis, William Grupo de Investigación en Aracnología & Miriapodología (GAM-UN), Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Bogotá & Fundación Arañas Tropicales - ArachnoTrAC, Bogotá, Colombia & Fundación Uru, Quito, Ecuador text Zootaxa 2024 2024-01-04 5397 2 295 300 http://dx.doi.org/10.11646/zootaxa.5397.2.11 journal article 10.11646/zootaxa.5397.2.11 1175-5326 10468548 89E89B4D-9D19-4A45-ACEF-DAC8C8CF96A9 Identification key for females of the genus Taczanowskia Modified from Levi (1996) , Ibarra-Nuñez (2013) and Jordán et al . (2021) . 1. Sides of opisthosoma with two lobes; opisthosoma widest near its posterior end...... T. trilobata Simon ( Levi, 1996 : fig. 20) 1’. Opisthosoma without such lobes; widest in the middle........................................................ 2 2. Femora III with a ventral row of teeth..................................................................... 3 2’. Femora III without a ventral row of teeth.................................................................. 4 3. Opisthosoma almost circular in dorsal view, with numerous dorsal tubercles.............................................................................................. T. gustavoi Ibarra-Núñez ( Ibarra-Núñez, 2013 : figs. 1–3) 3’. Opisthosoma clearly longer than wide, without dorsal tubercles, smooth..................... T. yasuni n. sp. ( Figs. 1a–c ) 4. Dorsum of opisthosoma with three pairs of tubercles.................. T. sextuberculata Keyserling ( Levi, 1996 : fig. 12) 4’. Opisthosoma with one pair of dorsal tubercles.............................................................. 5 5. Opisthosoma with colored patches, black feather-like setae and bundles of white setae on each side; carapace with radiating dark lines; total length less than 5.5 mm , narrower opisthosoma (1.4 times its length)................................................................................................... T. striata Keyserling ( Levi, 1996 : fig. 16) 5’. Opisthosoma without feather-like setae, carapace without radiating dark lines; total length usually more than 6.0 mm, wider opisthosoma (1.8 times its length)........................................................................ 6 6. Opisthosoma with patchy dark-light coloration, dark spots concentrated towards anterior margin and on lateral tips, bundles of white setae across the entire surface, forming a distinct reticulum; first two femora thick but lacking teeth on ventral region........................... T. onowoka Jordán , Domínguez-Trujillo & Cisneros-Heredia ( Jordán et al . 2021 : figs. 6A–D) 6’. Opisthosoma not as above, with different coloration patterns; bundles of setae absent; first two femora with teeth on ventral region................................................................ T. mirabilis Simon ( Levi, 1996 : fig. 8).