Oligoxystre dominguense, Guadanucci, José Paulo Leite, 2007

Guadanucci, José Paulo Leite, 2007, A revision of the Neotropical spider genus Oligoxystre Vellard 1924 (Theraphosidae, Ischnocolinae), Zootaxa 1555, pp. 1-20 : 13-15

Oligoxystre dominguense n. sp.

( Figures 25–29 )

Types. Holotype: Male, (IBSP 8625), São Domingos, Goiás, Brazil, A. Chagas Junior & M. G. Bichuette leg., IV. 2000. Paratype: Female (IBSP 9467), Serra da Mesa, Minaçú, Goiás, Brazil; Two males (IBSP 12505, MZSP 26536), São Domingos, Goiás, Brazil.

Etymology. named after the type-locality.

Diagnosis. Males may be distinguished from all other species by the bulb with a long embolus with a slight curvature subapically, where there is a small keel ( Figs. 26–28 ). Females may be distinguished by the spermathecae formed by two long and thin receptacula, with small lobes over its entire length ( Fig. 29 ).

Description. Male (Holotype). Total length: 18.1. Carapace: length 7.5; width 6.13. Eye tubercle: length 1.03; width 1.3. Labium: length 0.61; width 1.24. Sternum: length 3.38; width 3.06. Basal segment of chelicera with 8 teeth. Labium with 4 cuspules. Maxillae with 17–19 cuspules. Thoracic furrow straight, narrow. Palp: femur 4.41/ patella 2.97/ tibia 3.6/ cymbium 1.65/ total 12.63. Legs I: femur 7.37/ patella 4.43/ tibia 5.28/ metatarsus 5.67/ tarsus 3.26/ total 26.01. II: 6.78/ 3.78/ 5.02/ 5.02/ 3.06/ 23.66. III: 5.93/ 2.8/ 4.17/ 5.15/ 3.06/ 21.11. IV: 7.63/ 3.32/ 6.59/ 6.91/ 3.19/ 27.64. Spines: Palp: femur (d) 0-0-p1, patella 0, tibia (r) 0-0-1, (p) 0-1-1; Legs: I: femur (d) 0-0-p2, patella 0, tibia (v) 2-2-ap1, (p) 1-1-0, metatarsus (v) 1-0-0, (p) 1-0-0; II: femur (d) 0-p1-p2, patella 0, tibia (v) 1-2-ap2, (p) 1-1-0, metatarsus (v) 1-0-0, (p) 1-0-0; III: femur (d) 3-3-2, patella 0, tibia (r) 0-1-1, (v) 3-3-ap3, (p)1-1-0, metatarsus (d) 0-0-p1, (r) 0-1-1, (v) 1-0-ap2, (p)1-1-1; IV: femur (d) 3-2-2, patella 0, tibia (r) 1-1-1, (v) 2-2-2, (p) 1-1-0, metatarsus (d) 0-0-r1, (r) 0-1-ap1, (v) 1-0-0, (p) 1-0-0. Retrolateral lobe of cymbium slightly larger than prolateral lobe. Palpal bulb with long embolus with keel on subterminal portion ( Figs. 26–28 ). External branch of tibial spur enlarged apically and with spine inserted at its midlength, internal branch with spine inserted on its base ( Fig. 25 ). Metatarsus I slightly curved, not touching tibial spur when flexed. Scopula on metatarsi: I entire, apical ¾ of II, apical half of III– IV. Legs covered by many long white setae. Carapace brown. Abdomen dark brown.

Female (Paratype IBSP 9467). Total length: 27.4. Carapace: length 11.06; width 9.01. Eye tubercle: length 1.37; width 1.83. Labium: length 0.89; width 1.88. Sternum: length 5.24; width 4.32. Basal segment of chelicera with 8 teeth. Labium with 3 cuspules. Maxilla with 14–18 cuspules. Thoracic furrow straight. Palp: femur 5.44/ patella 3.92/ tibia 3.25/ tarsus 3.86/ total 16.47. Legs I: femur 7.37/ patella 5.28/ tibia 5.35/ metatarsus 4.76/ tarsus 2.8/ total 25.56. II: 6.52/ 4.56/ 4.63/ 4.24/ 2.8/ 22.75. III: 6.26/ 3.98/ 4.24/ 4.96/ 2.87/ 22.31. IV: 7.83/ 4.63/ 6.33/ 6.78/ 3.26/ 28.83. Spines: Palp: femur (d) 0-0-p1, patella 0, tibia (v) 0-0-ap2, (p) 0-2-0; Legs: I: femur (d) 0-0-p1, patella 0, tibia (v) 1-1-ap1, (p) 0-1-0, metatarsus (v) 1-0-0; II: femur (d) 0-0- p1, patella 0, tibia (v) 0-1-p1, (p) 1-1-0, metatarsus (v) 0-1-0; III: femur (d) 0-2-2, patella 0, tibia (r) 1-1-0, (v) 0-p1-ap2, (p)1-1-0, metatarsus (r) 0-1-1, (v) 2-0-ap3, (p) 1-1-1; IV: femur (d) 0-0-r1, patella 0, tibia (r) 0-0-1, (v) 0-p1-ap2, metatarsus (r) 0-1-1, (v) 1-p1-ap3, (p) 0-1-1. Spermathecae paired, receptaculum very long, with small lobes over its entire length ( Fig. 29 ). Long white setae covering legs. Coloration as in male.

Figures

FIGURES 25 – 29. Oligoxystre dominguiense n. sp. 25 – 27. Holotype male IBSP 8625. 25. Tibial apophysis, ventral, prolateral view. 26. Bulb, retrolateral view. 27. Bulb, prolateral view. 28. Male, embolus tip. 29. Paratype female IBSP 9467, spermathecae, dorsal view. Scale = 1 mm.