Uaica juruena Rheims, 2025, gen. et sp. nov.

Uaica juruena gen. et sp. nov. urn:lsid:zoobank.org:act: 17F3E4F3-A34B-404C-B11A-3DDD5636BD26 Figs 6–7, 15 Diagnosis Females resemble those of U. carapiranga gen. et sp. nov. (Figs 4C–D, 5D–F) by the epigyne with MS shaped as an inverted Y, bearing median EP (MS elongate with anterior EP in U. uatuma gen. et sp. nov.). They are distinguished from those of the latter species by the LL touching posteriorly and EP almost 3 × as long as wide (Figs 6C, 7A), and IDS tightly twisted, with five turns (Figs 6D, 7B–C) (LL not touching posteriorly, EP roughly as wide as long and IDS lightly twisted with three turns in U. carapiranga). Males are unknown. Etymology The specific epithet refers to the Juruena River that borders the type locality of the species, São Nicolau Farm; noun in apposition. Type material Holotype BRAZIL – Mato Grosso State • ♀; Cotriguaçu; Fazenda São Nicolau; [10.1326º S, 58.1412º W]; Jan. 2018; G. Almeida leg.; IBSP 233305. Description Female (holotype) COLOR. Prosoma pale yellow, slightly darker along thoracic striae and eye area; fovea pale brown; eye borders black; legs, pedipalps and chelicerae pale yellow; labium pale brown distally pale yellow. Endites pale yellow, distally lighter; sternum pale yellow with slightly darker margins; opisthosoma covered with marbled white irregular marks; dorsally with cardiac mark pale gray with spidery lines extending laterally; ventrally with pale gray median longitudinal band and parallel lines of muscle impressions; spinnerets pale yellow (Fig. 6A–B). MEASUREMENTS. Total length 8.5. Prosoma: 3.4 long, 3.0 wide. Opisthosoma: 5.0 long, 3.1 wide. Eyes: diameters 0.20, 0.20, 0.12, 0.17; interdistances 0.24, 0.20, 0.40, 0.34, 0.19, 0.17. Legs (2143): I: 14.8 (4.0, 1.6, 4.0, 4.1, 1.1); II: 16.9 (5.0, 1.8, 4.6, 4.3, 1.2); III: 10.8 (3.3, 1.3, 2.7, 2.5, 1.0); IV: 13.0 (3.9, 1.3, 3.4, 3.4, 1.0). EPIGYNE. EF longer than wide; LL touching each other posteriorly; MS slightly less than 2 × as long as wide; EP triangular 3 × as long as wide; CO anterior, at lateral margins of MS (Figs 6C, 7A). VULVA. IDS with first winding hook-shaped, running anteriorly as double helix; GP arising from last turn, closer to FD; FD antero-laterad (Figs 6D, 7B–C). Male Unknown. Distribution Only known from the type locality in the state of Mato Grosso (Fig. 15).