Oligoxystre tucuruiense, 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 : 15-16

Oligoxystre tucuruiense n. sp.

( Figures 30–33 )

Types. Holotype: Male (IBSP 9459), Tucuruí, Pará. Paratypes: Three females (IBSP 7936, MZSP 26537, MZSP 26538), Tucuruí, Pará, C. Pantoja & R. S. Pereira leg., 01.VII.1984; 2 females (IBSP 9468, IBSP 9462), Ilha Tocantins, Tucuruí, Pará, Brazil; female (IBSP 9461), Ilha das Cobras, Tucuruí, Pará, C. Pantoja leg., 25.VI.1984.

Etymology. named after the type-locality.

Diagnosis. Males differ from all other species of Oligoxystre by the tibial spur with prolateral branch smaller than the spine adjacent to it ( Fig. 30 ) (except O. auratum and O. dominguense ). Differs from the species O. auratum and O. dominguense by the male palpal bulb being long and thin, slightly bent in distal end, without keels ( Figs. 31–32 ). Females may be distinguished by the long spermathecae receptaculum, with numerous termini, and a lateral bilobed projection ( Fig. 33 ).

Description. Male (Holotype). Total length: 17.7. Carapace: length 7.57; width 6.78. Eye tubercle: length 1.22; width 1.81. Labium: length 0.61; width 1.42. Sternum: length 3.64; width 3.25. Basal segment of chelicera with 8 teeth. Labium with 1 cuspule. Maxilla with 21–24 cuspules. Thoracic furrow wide and short. Palp: femur 4.64/ patella 2.97/ tibia 3.73/ cymbium 1.35/ total 12.69. Legs I: femur 6.91/ patella 4.04/ tibia 5.35/ metatarsus 4.96/ tarsus 2.87/ total 24.13. II: 6.46/ 3.72/ 4.83/ 4.69/ 2.74/ 22.44. III: 5.74/ 2.93/ 4.24/ 5.93/ 3.39/ 22.23. IV: 7.18/ 3.39/ 6.2/ 6.72/ 2.93/ 26.42. Spines: Palp: femur (d) 0-0-p1, patella 0, tibia (p) 0-0-1; Legs: I: femur (d) 0-0-p1, patella 0, tibia (v) 2-2-r1, (p) 1-1-0, metatarsus (v) r1-0-0; II: femur (d) 0-0-p1, patella 0, tibia (v) r1-2-p1, (p) 1-1-0, metatarsus (v) 1-0-0; III: femur (d) 0-r1-2, patella 0, tibia (r)1-1-0, (v) 1- 2-ap2, (p)1-1-0, metatarsus (r) 1-1-ap1, (v) 2-0-ap1, (p) 1-1-ap1; IV: femur (d) 0-0-2, patella 0, tibia (r) 1-1-0, (v) 2-2-ap2, (p) 1-2-0, metatarsus (r) 0-1-1, (v) 2-0-ap3, (p) 0-1-1. Retrolateral lobe of cymbium slightly larger than prolateral lobe. Male palpal bulb long, thin, distal end slightly bent ( Figs. 31–32 ). Retrolateral branch of tibial spur with spine inserted at its midlength, prolateral branch smaller than spine adjacent to it ( Fig. 30 ). Metatarsus I slightly curved, does not touch the tibial spur when flexed. Coloration in alcohol: carapace light brown, abdomen brown (darker than carapace).

Female (Paratype IBSP 7936). Total length: 23.8. Carapace: length 8.91; width 7.68. Eye tubercle: length 1.4; width 1.96. Labium: length 0.89; width 1.79. Sternum: length 4.37; width 4.07. Basal segment of chelicera with 8 teeth. Labium with 2 cuspules. Maxilla with 16–19 cuspules. Thoracic furrow wide, slightly recurved. Palp: femur 4.63/ patella 2.95/ tibia 2.69/ tarsus 3.25/ total 13.52. Legs I: femur 6.33/ patella 3.98/ tibia 4.5/ metatarsus 4.11/ tarsus 2.61/ total 21.53. II: 6.13/ 3.98/ 4.24/ 4.04/ 2.54/ 20.93. III: 5.61/ 3.39/ 3.91/ 4.37/ 2.61/ 19.89. IV: 7.04/ 3.98/ 5.87/ 6.13/ 2.8/ 25.82. Spines: Palp: femur (d) 0-0-p1, patella 0, tibia (v) 0-0- ap2, (p) 0-1-0; Legs: I: femur (d) 0-0-p1, patella 0, tibia (v) 0-0-p1, metatarsus 0; II: femur (d) 0-0-p2, patella 0, tibia (v) 0-0-p1, (p) 0-1-0, metatarsus 0; III: femur (d) 0-0-r1, patella 0, tibia (r) 0-1-0, (v) 0-0-ap2, (p) 0-1- 0, metatarsus (p) 0-1-2; IV: femur (d) 0-0-r1, patella 0, tibia (r) 0-1-1, (v) 0-p1-ap2, metatarsus (r) 0-0-1, (v) 0- 1-0, (p) 0-1-1. Spermathecae paired, receptaculum long with small lobes and a lateral bilobed projection ( Fig. 33 ). Coloration in alcohol as in male.

Figures

FIGURES 30 – 33. Oligoxystre tucuruiense n. sp. 30 – 32. Holotype male IBSP 9459. 30. Tibial apophysis, ventral, prolateral view 31. Bulb, retrolateral view. 32. Bulb, prolateral view. 33. Paratype female IBSP 7936, spermathecae, dorsal view. Scale = 1 mm.