Uaica uatuma, Rheims, 2025

Uaica uatuma gen. et sp. nov.

urn:lsid:zoobank.org:act:55CE25EE-5589-424B-A000-7951CC7033D6

Figs 12–15 View Fig View Fig View Fig View Fig

Diagnosis

Males of U. uatuma gen. et sp. nov. resemble those of U. mapia gen. et sp. nov. ( Figs 10C–E View Fig , 11 View Fig ) 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 View Fig , 14C View Fig ) (S-shaped in retrolateral view in U. mapia ) and by the tegulum bearing an indentation at the base of E ( Figs 12D View Fig , 14B View Fig ) (arising straight from the tegulum in U. mapia ). Females distinguished from those of U. carapiranga gen. et sp. nov ( Figs 4C–D View Fig , 5D–F View Fig ) and U. juruena gen. et sp. nov. ( Figs 6C–D View Fig , 7 View Fig ) by anterior position of EP and slender, elongate MS, more than 3 × as long as wide ( Figs 13C View Fig , 14D View Fig ) (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 View Materials . GoogleMaps

Paratypes

BRAZIL – Amazonas State • 1 ♀; same data as for holotype; 1987–1988; IBSP 7345 View Materials GoogleMaps • 1 ♀; same data as for holotype; 1987–1988; IBSP 7346 View Materials GoogleMaps • 1 ♂; Manaus, Reserva do km 41; [2.4072º S, 59.7611º W]; Aug. 2000; A.J. Santos leg.; IBSP 37295 View Materials GoogleMaps .

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 View Fig ).

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 View Fig , 14A–C View Fig ).

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 View Fig ).

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 View Fig , 14D View Fig ).

VULVA. IDS running anteriorly in double helix; GP elongate, distally with short ramifications; arising from last turn, closer to FD; FD laterad ( Figs 13D View Fig , 14E–F View Fig ).

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 View Fig ).