Masteria aguaruna n. sp.

(Figs 19, 17C–D, 30D, 33)

Types. PERU. ♂ holotype, Santuário Nacional Tabaconas (7°9’52”S; 78°30’38”W), Namballe, Cajamarca, III.2008, S. Castro leg., deposited in IBSP 167153 ; ♀ paratype, Zungaracocha (7°9’52”S; 8°30’38”W), San Juan Bautista, Loreto, Iquitos, 08-09.IV.2013, C.A. Rheims & R.P. Indicatti leg., deposited in IBSP 167154 .

Additional material examined. PERU. Cajamarca: Namballe, Santuário Nacional Tabaconas (7°9’52”S; 78°30’38”W) 2♂, III.2008, S. Castro leg. (MACN-AR-30562).

Etymology. The specific name is a noun in apposition and refers to an ancestral Peruvian amazon tribe, Aguaruna.

Diagnosis. Males of Masteria aguaruna n. sp. resemble those of Masteria colombiensis, M. downeyi, M. lewisi, M. yacambu n. sp., M. amarumayu n. sp. and M. mutum n. sp. in the piriform palpal bulb and differ in the elongate embolus with median longitudinal keels and pointed embolus (Fig. 19B–C). Females resemble those of Masteria colombiensis, M. amarumayu n. sp. and M. mutum n. sp. in the bilobed spermathecae, with the ectal lobe thickened and projected with large glands on base but differ from those of M. colombiensis in the elongate ental lobe; from M. amarumayu n. sp. in the ectal lobe being shorter and thicker apically and from M. mutum n. sp. in the longer ental lobe (Fig. 19F).

Description. Male (Holotype). Color: Carapace in dorsal view and legs yellowish, carapace in ventral view and abdomen whitish. Total length 3.73. Carapace 1.79 long, 1.32 wide. Abdomen 1.94 long. Fovea 0.10. Clypeus 0.04. Ocular tubercle 0.19 long, 0.25 wide. Eyes: six, posterior row strongly recurved (Fig. 19A). AME absent, ALE 0.09, PME 0.06, PLE 0.10. Basal segment of chelicerae with 10–12 prolateral teeth, and 10–12 smaller mesobasal teeth. Labium 0.22 long, 0.22 wide. Sternum 0.82 wide, 0.88 long. Palp: femur 1.03/ patella 0.67/ tibia 0.91/ tarsus 0.57/ total 3.14. Legs I: femur 1.44/ patella 0.85/ tibia 1.44/ metatarsus 1.03/ tarsus 0.91/ total 5.67; II: 1.25/ 0.69/ 1.06/ 0.94/ 0.79/ total 4.73; III: 1.13/ 0.47/ 0.91/ 0.94/ 0.72/ 4.17; IV: 1.60/ 0.69/ 1.44/ 1.44/ 0.91/ 6.08; Leg formula 4123; Spination: palp: femur p1, patella v1-3 ap, p1, r1, tibia p1; Legs I: femur p1, patella v1-3 ap, p1, tibia v1-1 -3ap, p1-1, metatarsus v1-1; II: femur p1, patella v1-3 ap, p1-1-1, tibia d2b-1, v1-1 -3ap, p1, r1, metatarsus v1-1 -1, p1; III: femur p1, r1, patella v1-3 ap, p1-1, r1, tibia d2b-1, v1-1 -1-3ap, p1-1, r1-1, metatarsus d1-1, v2 b-1-1- 3, p1; IV: femur p1, r1, patella v1-3 ap, p1, r1-1, tibia d2b-1-1, v1-1 -1-3ap, p1-1-1, r2-1-1, metatarsus d1-1-1-1-2ap, v2-2 -3ap, p1, r1. Tibia I: P1 conical and with strong spur, P2 a strong spine with projected base below P1 and P3, and P3 two strong spines sharing the same projected base. Metatarsus I a flattened basal spine and basal depression associated with prolateral processes of tibia I (Figs 19E, 30D). Palpal tibia 1.5 times length of cymbium, with ventral apical depression, row of ventral and dorsal elongated slender setae, 35–40 strong and short spines on retrolateral area (Fig. 19D). Cymbium as long as wide with four apical spines. Palpal bulb with globose tegulum and long embolus, smaller than length of tegulum, tapering to apex (Fig. 19B–C). PLS: basal, medial and apical, 0.60, 0.54, 0.54 long.

Female (Paratype). Color: Live specimen, carapace in dorsal view, legs, spinnerets and abdomen brownish, chelicerae brown (Fig. 17C–D). In alcohol: Carapace, legs and abdomen whitish. Total length 2.50. Carapace 1.25 long, 1.04 wide. Abdomen 1.25 long. Fovea 0.06. Clypeus 0.03. Ocular tubercle 0.16 long, 0.22 wide. Eyes: six, posterior row strongly recurved. AME absent, ALE 0.09, PME 0.04, PLE 0.07. Basal segment of chelicerae with 10–12 prolateral teeth, and 10–12 smaller mesobasal teeth. Labium 0.19 long, 0.25 wide. Sternum 0.72 wide, 0.75 long. Palp: femur 0.79/ patella 0.44/ tibia 0.63/ tarsus 0.60/ total 2.46; Legs I: femur 1.16/ patella 0.66/ tibia 1.00/ metatarsus 0.79/ tarsus 0.60/ total 4.21; II: 0.94/ 0.54/ 0.72/ 0.63/ 0.57/ 3.40; III: 0.91/ 0.47/ 0.66/ 0.72/ 0.54/ 3.30; IV: 1.16/ 0.50/ 0.97/ 0.94/ 0.60/ 4.17; Leg formula 1423. Spination: palp: femur p1, patella d1ap, v1-3 ap, p1, tibia d1b-1, v1-1 -3ap, tarsus v1 b; Legs I: femur p1, patella v1-3 ap, p1, r1, tibia v1-1 -3ap, p1, metatarsus v1-1 -1; II: femur p1, patella v1-3 ap, p1, tibia v1-1 -3ap, p1b-1, metatarsus v1-1 -1; III: femur p1, r1, patella v1-3 ap, p1, r1-1, tibia d1-1, v1-1 -3ap, p1, r2-1-1, metatarsus d1-2ap, v2 b-1-3ap, p1; IV: femur p1, r1, patella v1-3 ap, p1, r1-1, tibia v1-1 -1-3ap, p1, r2-1-1, metatarsus d1-1-2ap, v2 b-1-3ap, p1. Palpal claw with 16 teeth. Spermathecae bilobed, ectal lobe conical, with thick base, dense glandular region, rounded apex, inner with short duct and elongated apex (Fig. 19F). PLS: basal, medial e apical, 0.38, 0.32, 0.32 long.

Variation. 2 males: total length 3.72–3.73.

Distribution. Northern Peru (Fig. 33).