Thaumasia caxiuana, Cruz Da Silva & Carico, 2012

Thaumasia caxiuana new species

Figs 4, 12, 88–97

Type. Male holotype from Floresta Nacional de Caxiuanã , Estação Científica Ferreira Penna , Melgaço, Pará, Brazil [ 01°44’S, 51°28’W], no date and collector ( MPEG 15599 View Materials ) GoogleMaps . Paratypes: one female, same locality and data as holotype ( MCTP 33350 View Materials ) GoogleMaps . One male from Barcarena, Pará, Brazil [ 01°30’S, 48°40’W], 22.I.1984, Jarbas ( MPEG 3447 View Materials ) GoogleMaps .

Etymology. The specific name is a noun and refers to type locality.

Conditions of holotype. Missing right leg I.

Diagnosis. The males of T. caxiuana sp. nov. resemble those of T. abrahami ( Fig. 84) by the rounded apex of the median apophysis, but can be distinguished by the shorter median apophysis ( Fig. 89), by ental branch of RTA with a thin, lamellar base and a longer and slender tip ( Fig. 91). The females resemble those of T. velox ( Fig. 60) by the presence of prominent lateral lobes and by the slightly projected middle field of epigynum ( Fig. 92), but can be distinguished by the laterally less deeply excavated middle field ( Fig. 92), by the shorter and folded copulatory ducts ( Fig. 93) and by the shape of the head of spermathecae ( Fig. 94).

Description. Male ( Holotype, Melgaço, Pará, Brazil, MPEG 15599). Total length 12.36. Carapace 6.38 long, 5.71 wide, light brown with a thin lateral white band. Clypeus light brown, 0.76 high. Anterior eye row slightly procurved ( Fig. 12), 1.16 wide; posterior recurved, 2.10 wide. Eye diameters, interdistances, and median ocular quadrangle: AME 0.22, ALE 0.16, PME 0.32, PLE 0.40; AME-AME 0.20, AME-ALE 0.12, PME-PME 0.36, PME-PLE 0.44, OQA 0.66, OQP 1.00, OQH 0.70. Chelicerae light brown, slightly depressed laterally, without the tufts of white bristles laterally, with scattered bristles ( Fig. 12). Sternum yellow, bristly; 2.57 long, 2.90 wide. Labium light brown, dark brown laterally, 0.85 long, 0.99 wide. Legs light brown, unmarked, with numerous dark brown macrosetae; relative length: IV-I-II-III, I—femur 9.97/ patella-tibia 13.83/ metatarsus 8.24/ tarsus 3.85/ total 35.89; II—10.24/ 13.69/ 8.51/ 3.44/ 35.88; III—8.91/ 11.97/ 7.58/ 3.59/ 32.05; IV—10.37/ 13.96/ 9.70/ 4.52/ 38.55. Ventral pairs of macrosetae on tibiae: I-4; II-5; III-4; IV-4. Abdomen 5.85 long, dark gray with two parallel white bands formed by small white bristles; with two pairs of sigillae and two pairs of irregular white spots near the spinnerets. Venter light gray; with scattered bristles. Palpus with a conspicuous median apophysis, with a blunt apex ( Figs 88, 89). Ental branch of RTA with a thin and short lamellar projection at the base ( Fig. 91) and ectal branch of RTA short and with a rounded apex ( Figs 90, 91).

Female ( Paratype, Melgaço, Pará, Brazil, MCTP 33350). Total length 12.90. Carapace, colour as in male, 6.11 long, 5.45 wide, as in male. Clypeus light brown, 0.68 high. Anterior eye row slightly procurved, 1.18 wide; posterior recurved, 2.00 wide. Eye diameters, interdistances, and median ocular quadrangle: AME 0.22, ALE 0.20, PME 0.30, PLE 0.28; AME-AME 0.24, AME-ALE 0.14, PME-PME 0.38, PME-PLE 0.46, OQA 0.64, OQP 1.00, OQH 0.74. Chelicerae light brown. Sternum yellow, 2.90 long, 2.90 wide. Labium, colour as in male, 0.99 long, 0.91 wide. Legs yellow, unmarked; relative length: IV-II-I-III, I—femur 8.51/ patella-tibia 11.70/ metatarsus 6.91/ tarsus 3.32/ total 30.44; II—8.64/ 11.57/ 7.31/ 3.58/ 31.10; III—7.71/ 10.10/ 6.38/ 3.09/ 27.28; IV—8.63/ 11.83/ 8.11/ 4.25/ 32.82. Ventral pairs of macrosetae on tibiae: I-4; II-4; III-4; IV-5. Trichobothrial hood smooth and with two lateral projections ( Fig. 95). Tarsal organ with an elliptical opening ( Fig. 96). Superior tarsal claw with eight teeth; inferior with one tooth ( Fig. 97). Abdomen 7.31 long, colour as in male. Epigynum with a slightly excavated middle field and with conspicuous and deeply excavated hood ( Fig. 92). Copulatory ducts elongated and wide ( Fig. 93); head of spermathecae small and with pores ( Fig. 94).

Other material examined. BRAZIL, Tocantins: Palmas [ 10°00'S, 48°19'W], 1 ♂, 11-28.III.1998, M. Calleffo ( IBSP 17584 View Materials ) GoogleMaps .

Distribution. Brazil (Pará) ( Fig. 4).