Masteria yacambu, Passanha & Brescovit, 2018

Passanha, Victor & Brescovit, Antonio D., 2018, On the Neotropical spider Subfamily Masteriinae (Araneae, Dipluridae), Zootaxa 4463 (1), pp. 1-73 : 23-24

Masteria yacambu n. sp.

( Figs 12 , 29D , 32 )

Types. VENEZUELA. ♂ holotype, ♀ paratype, Lara, (09°42’22”N; 69°34’42”W), Yacambu, National Park Yacambu, 14.4 km S. E. Sanare, 1500m, 17.V.1998, R. Anderson leg., deposited in AMNH .

Etymology. The species epithet is a noun in apposition taken from the type locality.

Diagnosis. Males of M. yacambu n. sp. resemble those of M. colombiensis , M. downeyi , M. lewisi , M. amarumayu n. sp., M. mutum n. sp. and M. aguaruna n. sp. in the piriform palpal bulb, but differ in the embolus tip with distal curvature ( Fig. 12B–C ) and double P 2 in the leg tibia ( Fig. 29D ). Females resemble those of M. tayrona n. sp. in the presence of four lobes on spermathecae ( Fig. 22G ), and differ in the short and uniform ectal lobe ( Fig. 12E ).

Description. Male (holotype). Color: Carapace orange, legs yellow and abdomen whitish. Total length 2.85. Carapace 1.41 long, 1.16 wide. Abdomen 1.44 long. Fovea 0.06. Clypeus absent. Ocular tubercle 0.22 long, 0.25 wide. Eyes: six, posterior row strongly recurved. AME absent, ALE 0.13, PME 0.06, PLE 0.12. Basal segment of chelicerae with 10 prolateral teeth, and 10 smaller mesobasal teeth. Labium 0.16 long, 0.22 wide. Sternum 0.66 wide, 0.88 long. Palp: femur 0.63/ patella 0.47/ tibia 0.63/ tarsus 0.35/ total 2.08; Legs I: femur 1.29/ patella 0.69/ tibia 1.16/ metatarsus 0.94/ tarsus 0.82/ total 4.90; II: 1.04/ 0.54/ 0.79/ 0.75/ 0.57/ total 3.69; III: 0.91/ 0.41/ 0.72/ 0.79/ 0.54/ 3.37; IV: 1.38/ 0.54/ 1.13/ 1.16/ 0.72/ 4.93. Leg formula 4123. Spination: palp: femur p1, patella d1, tibia p1; Legs I: patella v1, tibia v1, p1, metatarsus v1-1 ap; II: patella v1, p1, tibia v1-1 -3ap, p1, metatarsus v1-1 -1, p1; III: femur r1, patella v2, p1-1, r1, tibia v1-1 -3ap, p1-1, r1-1-1, metatarsus d1-2, v1-1 -3ap, p2; IV: femur p1, r1, patella v2, p1, r1-1, tibia d1-1, v1-1 -3ap, p1-1, r2-1-1, metatarsus d1-1-1ap, v2-3 -3ap, p1-1, r1-1. Tibia I: P1 a strong and rounded spur, P2 with two strong spines with slightly projected base below P1 and P3, and P3 two spines on same projected base. Metatarsus I with flattened basal spine and basal depression associated with prolateral processes of tibia I ( Figs 12F , 29D ). Palp: tibia twice length of cymbium, with row of dorsal and ventral elongate slender setae. Cymbium as long as wide, with four apical spines. Bulb piriform with oval tegulum, embolus as long as tegulum, distally tapering ( Fig. 12B–C ). PLS: basal and medial, 0.40, 0.46 long, apical segment lost.

Female (Paratype). Color: Carapace in dorsal view orange, in ventral view and legs yellowish, abdomen whitish. Total length 3.26. Carapace 1.63 long, 1.25 wide. Abdomen 1.63 long. Fovea 0.10. Clypeus absent. Ocular tubercle 0.25 long, 0.19 wide. Eyes: six, posterior row strongly recurved ( Fig. 12A ). AME absent, ALE 0.11, PME 0.06, PLE 0.10. Basal segment of chelicerae with 10 prolateral teeth, and 10 smaller mesobasal teeth. Labium 0.13 long, 0.16 wide. Sternum 0.69 wide, 0.85 long. Palp: femur 0.97/ patella 0.57/ tibia 0.79/ tarsus 0.82/ total 3.15; Legs I: femur 1.38/ patella 0.75/ tibia 1.16/ metatarsus 1.04/ tarsus 0.82/ total 5.15; II: 1.16/ 0.60/ 0.94/ 0.85/ 0.69/ 4.24; III: 1.10/ 0.57/ 0.82/ 0.91/ 0.60/ 4.00; IV: 1.47/ 0.66/ 1.25/ 1.19/ 0.75/ 5.32; Leg formula 4123. Spination: palp: femur p1, patella d1, v1-3 ap, tibia v2-2 -3ap, p1, tarsus v2 b; Legs I: femur p1, patella v1-1, p1, tibia v1-1 -3ap, p1, metatarsus v1-1 -1; II: femur p1, patella v1-2, p1-1, tibia v1-1 -3ap, p1-1-1, metatarsus v1-1 -3ap, p1; III: femur p1, r1, patella v1-2 ap, p1-1, r1, tibia v1-1 -3ap, p1, r1-1, metatarsus d1-1, v2-2 -3ap, p1-1, r1; IV: femur p1, patella v1-2 ap, p1-1, r1-1, tibia v1-2 -2-3ap, p1-1, r2-1-1, metatarsus d1-2ap, v1-1 -3ap, p1-1, r1-1. Palpal claw with 19 teeth. Spermathecae with four short lobes, with globose apex, all on dense glandular region. Lobes similar, except the ectal lobe shortest. Ental lobe occupying median region ( Fig. 12E ). PLS: basal, medial and apical, 0.54, 0.50, 0.50 long.

Distribution. Northern Venezuela ( Fig. 32 ).

Figures

FIGURE 12. Masteria yacambu n. sp. (male and female, Lara, Yacambu, National Park Yacambu, Venezuela, AMNH). A Female eyes, dorsal view; B Palpal bulb in retrolateral view, embolus tip in detail; C Palpal bulb in prolateral view; D, E. Female genitalia; F Prolateral processes of tibia I (left leg, proventral view). Abbreviations: BS, basal spine; P1, Process 1; P2, Process 2; P3, Process 3. Scale bars: A 50µm; B, C 0.1mm; D, E, F 100µm.

FIGURE 22. Masteria tayrona n. sp. (paratypes male and female, Sierra Nevada de Santa Marta, Colombia, IBSP 167162 and IBSP 167163). A–E, male. A Eyes, dorsal view; B Left palp, retrolateral view; C embolus, retrolateral view; D P1 detail; E Prolateral processes of tibia I (left leg, prodorsal view); F Female genitalia, dorsal view. Abbreviations: BS, basal spine; P1, Process 1; P2, Process 2; P3, Process 3. Scale bar: A 100µm; B 200µm; C 50µm; D 40µm; E 50µm; F 100µm.

FIGURE 29. Prolateral processes of leg I. A Masteria petrunkevitchi. B M. barona. C M. soucoyant. D M. yacambu. E M. colombiensis. F M. downeyi. Abbreviations: BS, Basal spine; P1, Process 1; P2, Process 2; P3, Process 3. Scale bar: A 100µm; B 200µm, C 100µm, D 100µm, E 0.1mm, F 50µm.

FIGURE 32. Distribution map of Masteria species.