Uaica uatuma Rheims, 2025, gen. et sp. nov.
Creators: name: Rheims, Cristina A.
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Sparassidae
Uaica
Uaica uatuma

description: Uaica uatuma gen. et sp. nov.
urn:lsid:zoobank.org:act: 55CE25EE-5589-424B-A000-7951CC7033D6
Figs 12–15
Diagnosis
Males of U. uatuma gen. et sp. nov. resemble those of U. mapia gen. et sp. nov. (Figs 10C–E, 11) by the E slender, longer than C and arising from tegulum at 8:30 o’clock position, but are distinguished by the RTA straight and conical in ventral view and slightly bent medially in retrolateral view (Figs 12E, 14C) (S-shaped in retrolateral view in U. mapia) and by the tegulum bearing an indentation at the base of E (Figs 12D, 14B) (arising straight from the tegulum in U. mapia). Females distinguished from those of U. carapiranga gen. et sp. nov (Figs 4C–D, 5D–F) and U. juruena gen. et sp. nov. (Figs 6C–D, 7) by anterior position of EP and slender, elongate MS, more than 3 × as long as wide (Figs 13C, 14D) (slightly more median EP and MS shaped as an inverted Y, slightly longer than wide in the later species).
Etymology
The specific epithet refers to the type locality. The Usina Hidrelétrica de Balbina (Balbina Hydroelectric Plant) was built on the Uatumã River in northeastern Amazonas; noun in apposition.
Type material
Holotype BRAZIL – Amazonas State • ♂; Presidente Figueiredo; Usina Hidrelétrica de Balbina; [1.9000º S, 59.4667º W]; 7 Dec. 1988; Equipe Butantan leg.; IBSP 7372.
Paratypes BRAZIL – Amazonas State • 1 ♀; same data as for holotype; 1987–1988; IBSP 7345 • 1 ♀; same data as for holotype; 1987–1988; IBSP 7346 • 1 ♂; Manaus, Reserva do km 41; [2.4072º S, 59.7611º W]; Aug. 2000; A.J. Santos leg.; IBSP 37295.
Description
Male (holotype)
COLOR. Prosoma pale brownish orange with slightly darker margins; fovea dark brown; eye borders black. Chelicerae same as prosoma. Legs and palps lighter than prosoma. Labium pale brown, distally pale orange. Endites pale orange. Sternum pale yellow with pale brown margins. Opisthosoma yellowish cream colored; dorsally with whitish marbled irregular marks around cardiac mark and posteriorly close to spinnerets; ventrally with three whitish marbled marks running posteriorly from epiandrous region to spinnerets. Spinnerets cream colored (Fig. 12A–B).
MEASUREMENTS. Total length 5.5. Prosoma: 2.7 long, 2.5 wide. Opisthosoma: 2.7 long, 1.6 wide. Eyes: diameters 0.25, 0.20, 0.15, 0.20; interdistances 0.16, 0.05, 0.30, 0.19, 0.15, 0.05. Legs (2143): I: 21.0 (5.6, 1.6, 6.1, 6.1, 1.6); II: 24.0 (6.5, 1.6, 7.2, 7.0, 1.7); III: 14.5 (4.2, 1.2, 4.1, 3.9, 1.1); IV: 17.8 (5.0, 1.2, 5.0, 5.2, 1.4).
PALP. RTA longer than wide, mostly straight and pointed; tegulum forming a slight indentation probasally; sp running retrolaterally in a straight line; C arising medially, more than 6 × as long as wide, shorter than E; E filiform with wide base, curved at tip (Figs 12C–E, 14A–C).
Female (paratype, IBSP 7346)
COLOR. Coloration pattern much darker than in male. Prosoma orange brown with darker margins; fovea dark brown; eye borders black. Chelicerae and legs as prosoma. Labium, endites and sternum brownish orange. Opisthosoma grayish brown; dorsally with elongated marks laterally and posteriorly; ventrally with shorter marks laterally and two parallel lines of muscle impressions. Spinnerets pale brownish cream colored (Fig. 13A–B).
MEASUREMENTS. Total length 7.0. Prosoma: 3.2 long, 3.0 wide. Opisthosoma: 3.6 long, 2.1 wide. Eyes: diameters 0.22, 0.22, 0.16, 0.20; interdistances 0.20, 0.14, 0.36, 0.32, 0.18, 0.14. Legs (2143): I: 17.7 (4.9, 1.8, 4.9, 4.7, 1.4); II: 19.8 (5.7, 1.8, 5.6, 5.2, 1.5); III: 12.6 (3.7, 1.4, 3.3, 3.1, 1.1); IV: 15.3 (4.4, 1.4, 4.1, 4.1, 1.30).
EPIGYNE. EF as long as wide; LL smooth and parallel; MS with elongate lateral rims (Figs 13C, 14D).
VULVA. IDS running anteriorly in double helix; GP elongate, distally with short ramifications; arising from last turn, closer to FD; FD laterad (Figs 13D, 14E–F).
Variation
Two males: total length 5.5−6.5; prosoma length 2.7−2.9; femur I length 5.6−6.1. Two females: total length 7.0−9.7; prosoma length 3.2−3.5; femur I length 4.8−4.9.
Distribution
Known from central and eastern Amazonas State (Fig. 15).
description: Published as part of Rheims, Cristina A., 2025, Uaica gen. nov., a new genus of huntsman spiders from the Brazilian Amazonia (Araneae: Sparassidae), pp. 24-49 in European Journal of Taxonomy 989 on pages 42-46, DOI: 10.5852/ejt.2025.989.2879, http://zenodo.org/record/15323017