Oligoxystre caatinga

Description. Male (Holotype). Total length: 25.1. Carapace: length 9.41; width 7.71. Eye tubercle: length 1.27; width 1.5. Labium: length 0.76; width 1.44. Sternum: length 4.62; width 4.2. Basal segment of chelicera with 9 – 10 teeth. Labium with 3 cuspules. Maxilla with 30 – 35 cuspules. Sternum oval. Thoracic fovea straight. Palp: femur 5.19 / patella 3.51 / tibia 4.58 / cymbium 1.91 / total 15.19. Legs I: femur 8.03 / patella 5.19 / tibia 6.41 / metatarsus 5.35 / tarsus 3.32 / total 28.3. II: 7.31 / 4.5 / 5.61 / 5.22 / 3.26 / 25.9. III: 6.39 / 3.32 / 4.56 / 5.8 / 3.59 / 23.66. IV: 8.27 / 4.05 / 6.89 / 7.95 / 3.73 / 30.89. Spines: Palp: femur (d) 0 - 0 - p 1, patella 0, tibia (p) v 1 - 1 - 0; Legs: I: femur (d) 0 - p 1 - p 1, patella 0, tibia (v) 1 - 3 - r 1, (p) 0 - 0 - 1, metatarsus (r) 2 - 0 - 0; II: femur (d) 0 - 0 - p 1, patella 0, tibia (v) 2 - 2 - 2, (p) d 1 - 1 - d 1, metatarsus (v) r 2 - 0 - 0; III: femur (d) 2 - 2 - 2, patella (p) 1, tibia (r) 1 - 1 - 0, (v) 3 - 3 - 2, (p) 1 - 1 - 0, metatarsus (d) 0 - 2 - p 1, (r) ap 1, (v) 2 - 2 - p 1, (p) 1 - 1 - 1; IV: femur (d) 0 - 5 - 5, patella 0, tibia (r) d 1 - 0 - 1, (v) 3 - 3 - ap 2, (p) 0 - 1 - 0, metatarsus (d) 0 - 1 - 2, (v) 3 - 1 - ap 2. Retrolateral lobe of cymbium slightly larger than prolateral lobe. Palpal bulb long and thin, without keels, and slightly curved (Figs. 22 – 23). Retrolateral branch of tibial spur with spine inserted at its midlength, internal branch with spine of same size inserted on its base (Fig. 21). Metatarsus I bends retrolaterally to tibial spur. Ventral surface dark; dorsally with many white setae (Fig. 38). Female (Paratype IBSP 8549). Total length: 34.2. Carapace: length 12.29; width 10.34. Eye tubercle: length 1.35; width 1.8. Labium: length 1.06; width 2.1. Sternum: length 5.75; width 4.88. Basal segment of chelicera with 12 – 13 teeth. Labium with 8 cuspules. Maxilla with 15 – 20 cuspules. Thoracic fovea recurved. Palp: femur 6.2 / patella 4.17 / tibia 3.39 / tarsus 3.8 / total 17.56. Legs I: femur 8.03 / patella 5.76 / tibia 5.7 / metatarsus 4.8 / tarsus 4.46. II: 7.5 / 5.22 / 5.09 / 4.56 / 3 / 25.37. III: 6.78 / 4.24 / 4.17 / 5.3 / 3.06 / 25.55. IV: 8.84 / 4.95 / 6.57 / 7.54 / 3.49 / 31.39. Spines: Palp: femur (d) 0 - 0 - p 1, patella 0, tibia (v) p 1 - 2 - ap 2, (p) 0 - 1 - 0, metatarsus 0; Legs: I: femur 0, patella 0, tibia (v) 0 - 1 - 0, metatarsus (v) 0 - 1 - 0; II: femur (d) 0 - 0 - p 1, patella 0, tibia (v) 0 - 1 - 0, (p) 0 - d 1 - 0, metatarsus (v) r 1 - 0 - 0; III: femur (d) 0 - 0 - 2, patella (p) 1, tibia (r) 1 - 1 - 0, (v) 1 - 2 - ap 2, (p) 1 - 1 - 0, metatarsus (r) 0 - 1 - d 1, (v) 2 - 0 - ap 2, (p) 1 - 1 - 1; IV: femur (d) 0 - 0 - r 1, patella 0, tibia (r) 1 - 1 - 0, (v) 2 - 1 - ap 2, metatarsus (d) 0 - 0 - d 1, (v) 1 - 0 - ap 3, (p) 1 - 1 - 1. Spermathecae paired, receptaculum much longer than wide, with 2 – 8 termini on apex (Fig. 24). Coloration as in male, but without white setae dorsally.

Types. Holotype: male, (IBSP 9487), Central, Bahia, Brazil; A. D. Brescovit & E. F. Ramos leg., 12 – 27. VII. 2000. Paratypes: female (IBSP 8549), Toca da Esperança, Jussara, Bahia, Brazil, A. D. Brescovit et al. leg., 12 – 27. VII. 2000; female, (IBSP 9482), Central, Bahia, Brazil, A. D. Brescovit & E. F. Ramos leg., 12 – 7. VII. 2000; female (MZSP 18977), Caatinga do Moura, Bahia, Brazil, P. E. Vanzolini leg., 24 – 29. I. 1980; male (IBSP 8750), Central, Bahia, Brazil, A. D. Brescovit et al. leg., VII. 2000.

Diagnosis. Differs from other species of Oligoxystre by being very dark ventrally, and by the white setae on the carapace and legs, which are more evident in males. Males may be distinguished by the slender and elongated embolus without keels (Figs. 22 – 23). Females may be distinguished by the long receptacula with numerous termini on the apex (Fig. 24).

Etymology. Named after the type-locality, which is located in the Brazilian habitat called " caatinga ". Proposed as a noun in apposition.

Additional material examined. BRAZIL. Alagoas: Rio Tigre, Maravilha, 1 Ψ (MNRJ 3852). Bahia: Barreiras, 1 Ψ (IBSP 8688); 1 Ψ (IBSP 9497); Brumado, 1 ɗ (IBSP 9453); Casa Nova j (MNRJ 3849); Central, 1 Ψ (IBSP 9470), 1 Ψ (IBSP 9476), 1 Ψ (IBSP 9483), 1 Ψ (IBSP 9481), 1 Ψ (IBSP 9469), 1 Ψ (IBSP 9477), 1 Ψ (IBSP 9478), 1 Ψ (IBSP 9480), 1 Ψ (IBSP 9454), 1 Ψ (IBSP 9479), 1 ɗ (IBSP 8747), 1 ɗ (IBSP 9484), 1 ɗ (IBSP 8550), 1 Ψ (IBSP 8551), 1 ɗ (IBSP 8554), 1 ɗ (IBSP 8552), 1 Ψ (IBSP 8751), 1 ɗ (IBSP 9490), 1 ɗ (IBSP 9486), 1 ɗ (IBSP 9485), 1 ɗ (IBSP 9448), 1 Ψ (IBSP 9471), 1 Ψ (IBSP 8723); Jacobina, 1 Ψ (IBSP 9456), 1 Ψ (IBSP 9455), 1 Ψ (MZSP 18980); Lagoa de Itaparica, Xique-Xique, 3 j and 1 Ψ (MZSP 18987); Lindo Horizonte, 1 Ψ (IBSP 10170); Maracás, 1 Ψ (IBSP 8317); Serra do Estreito, 1 Ψ (IBSP 9458); Serra do Ouro, Jacobina, 2 j and 2 Ψ (MZSP 18980); Vacaria, 3 j and 1 Ψ (MZSP 18985). Ceará: Cachoeira do Calista, Parambú, 4 Ψ and 1 j (MNRJ 3848). Pernambuco: Condado, 1 Ψ (IBSP 8084); Floresta, 1 Ψ (IBSP 4931 - B). Piauí: Bocaina 1 Ψ e 1 j (MNRJ 13788); Curimatá, 1 Ψ (IBSP 9475), 1 Ψ (IBSP 9457); Parnaíba, 1 Ψ (IBSP 9449), 1 Ψ (IBSP 9472), 1 Ψ (IBSP 9473), 1 ɗ (IBSP 9499); Salgueiro, 1 Ψ (IBSP 10394); São Raimundo Nonato, 1 Ψ (IBSP 9474); Valença do Piauí, 1 Ψ (MZSP 14891). Rio Grande do Norte: Seridó, 1 Ψ (IBSP 7984).