Thaumasia caxiuana, Cruz Da Silva & Carico, 2012

Cruz Da Silva, Estevam L. & Carico, James E., 2012, 3567, Zootaxa 3567, pp. 1-64 : 18-19

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 ) . Paratypes: one female, same locality and data as holotype ( MCTP 33350 ) . One male from Barcarena, Pará, Brazil [01°30’S, 48°40’W], 22.I.1984, Jarbas ( MPEG 3447 ) .

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 ) .

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