Masteria mutum, Passanha & Brescovit, 2018

Passanha, Victor & Brescovit, Antonio D., 2018, On the Neotropical spider Subfamily Masteriinae (Araneae, Dipluridae), Zootaxa 4463 (1), pp. 1-73 : 32-34

Masteria mutum n. sp.

( Figs 18 , 30C , 33 )

Types. BRAZIL. ♂ holotype, Acampamento Mutum (01°36’44.7”S; 56°11’39.2”W), Juruti , Pará, 06-13.II.2007, N.F. Lo Man Hung & J.A.P. Barreiros leg., deposited in MPEG 023317 ; ♀ paratype, Platô Capiranga (02°28’22.1”S; 56°12’29.4”W), Juruti, Pará, 22.XI.2007, D.F. Candiani & N.F. Lo Man Hung leg., deposited in MPEG 0 23326.

Additional material examined. BRAZIL, Pará: Juruti, Acampamento Mutum (01°36’44.7”S; 56°11’39.2”W), 1♀, 03-10.VI.2007, ( MPEG 023322 ); 1♂, 03-10.VI.2007, ( MPEG 023314 ); 1♂, 06-13.II.2007, N. F. Lo-Man-Hung & J. A. P. Barreiros leg. ( MPEG 023315 ); 1♂, 03-10.VI.2007, ( MPEG 023318 ); Platô Capiranga (02°28’22.1”S; 56°12’29.4”W), 1♂, 15.VIII.2006, ( MPEG 008592 ); 1♀, 15.VIII.2006, ( MPEG 008608 ); 1♂, 13.II.2007, ( MPEG 023331 ); Platô do Rio Juruti , Igarapé Mutum (02°36’45.2”S; 56°11’27.5”W), 1♂, 04- 11.IX.2002 ( MPEG 001065 ), all collected by D. F. Candiani, J. A. P. Barreiros & N .F. Lo Man Hung leg.

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

Diagnosis. Males resemble those of M. colombiensis , M. downeyi , M. lewisi , M. yacambu n. sp., M. amarumayu n. sp. and M. aguaruna n. sp. in the piriform palpal bulb. They differ from those of M. colombiensis , M. downeyi , M. lewisi , M. yacambu n. sp. and M. aguaruna n. sp. in the embolus being slightly coiled and narrowed subdistally ( Fig. 18B–C ); from M. amarumayu n. sp. in having a basal spine on metatarsus I and large P2 on tibia I ( Figs 18D , 30C ). Females are similar to those of Masteria colombiensis , M. amarumayu n. sp. and M. aguaruna n. sp. in the bilobed spermathecae, with ectal lobe conical and high with large basal glands. Females differ from those of M. colombiensis n. sp. in the ental lobe having an elongated duct; from M. amarumayu n. sp. in the ectal lobe being shorter and apically thicker; and from M. aguaruna n. sp. in the smaller ental lobe ( Fig. 18E–F ).

Description. Male (MPEG 8592). Color: Carapace in dorsal view and legs yellowish, carapace in ventral view and abdomen whitish. Total length 3.29. Carapace 1.47 long, 1.07 wide. Abdomen 1.82 long. Fovea 0.08. Clypeus 0.02. Ocular tubercle 0.16 long, 0.22 wide. Eyes: six, posterior row slightly recurved ( Fig. 18A ). AME absent, ALE 0.10, PME 0.04, PLE 0.06. Basal segment of chelicerae with 12 prolateral teeth, and 12 smaller mesobasal teeth. Labium 0.19 long, 0.25 wide. Sternum 0.69 wide, 0.88 long. Palp: femur 0.79/ patella 0.41/ tibia 0.72/ tarsus 0.41/ total 2.33; Legs I: femur 1.25/ patella 0.63/ tibia 1.16/ metatarsus 0.85/ tarsus 0.72/ total 4.61; II: 0.97/ 0.50/ 0.88/ 0.75/ 0.63/ total 3.73; III: 0.97/ 0.44/ 0.69/ 0.75/ 0.57/ 3.42; IV: 1.29/ 0.50/ 1.19/ 1.16/ 0.72/ 4.86; Leg formula 4123; Spination: palp: patella v1-3 ap, p1, tibia p1; Legs I: femur p1, patella v1-1 -1, r1, tibia v1-1 -1-1-1, p1, metatarsus v1-1 -1; II: femur p1, patella v1-3 ap, p1-1, tibia v1-1 -3ap, p1-1-1, p1-1, metatarsus v1-1 -1-1; III: femur p1-1, patella v1-3 ap, p1-1-1, r1, tibia d2b-1-1, v1-1 -3ap, p1-1, r1-1, metatarsus d1-1, v2-2 -3ap, p1-1, r1; IV: femur p1, r1, patella v1-3 ap, p1, r1-1, tibia d3b-1-1, v1-1 -1-3ap, p1-1, r1-1-1, metatarsus d1-1, v2-2 -3ap, p1-1-1, r1. Tibia I: P1 absent, P2 a strong spine with normal base, and P3 short and rounded with projected base. Metatarsus I with a flattened basal spine and a basal depression associated with the prolateral processes of tibia I ( Figs 18D , 30C ). Palpal tibia twice the length of the cymbium, with a row of dorsal and ventral slender setae. Cymbium as long as wide with four apical spines. Palpal bulb piriform with elongated embolous, long embolus, slightly smaller than tegulum size ( Fig. 18B–C ). PLS: basal, medial and apical, 0.47, 0.47, 0.47 long.

Female (MPEG 23322). Color: Carapace and legs yellowish, abdomen light brown. Total length 2.79. Carapace 1.32 long, 1.04 wide. Abdomen 1.47 long. Fovea 0.05. Clypeus 0.03. Ocular tubercle 0.13 long, 0.19 wide. Eyes: six, posterior row slightly recurved. AME absent, ALE 0.08, PME 0.03, PLE 0.06. Basal segment of chelicerae with 12 prolateral teeth, and 10-12 smaller mesobasal teeth. Labium 0.16 long, 0.29 wide. Sternum 0.69 wide, 0.75 long. Palp: femur 0.63/ patella 0.38/ tibia 0.54/ tarsus 0.54/ total 2.09; Legs I: femur 1.10/ patella 0.50/ tibia 0.79/ metatarsus 0.69/ tarsus 0.57/ total 3.65; II: 0.75/ 0.35/ 0.50/ 0.47/ 0.44/ 2.51; III: 0.78/ 0.38/ 0.50/ 0.63/ 0.47/ 2.76; IV: 1.07/ 0.50/ 0.84/ 0.81/ 0.63/ 3.85. Leg formula 4132. Spination: palp: patella v1-3 ap, tibia v1-1 -1, tarsus v1 b; Legs I: femur r1, patella v1-3 ap, tibia v1-1 -1, metatarsus v1-1 -1-3ap; II: femur p1, r1, patella v1-3 ap, p1, r1, tibia v1-1 -1-3ap, r1-1, metatarsus v1-1 -1, p1; III: femur p1, r1, patella v1-3 ap, p1, tibia v1-1 -1-3ap, r1-1, metatarsus v1-1 -1, p1; IV: femur p1, r1, patella v1-3 ap, p1, r1, tibia d2b-1, v1-1 -1-3ap, p1-1-1, r1-1, metatarsus d1- 1-1, v1-1 -1, p1-1, r1. Palpal claw with 14 teeth. Spermathecae bilobed, ectal lobe high, conical, with thick base, dense glandular region and rounded apex, ental lobe connected to external lobe, with thin duct and globose apex ( Fig. 18E–F ). PLS: basal, medial and apical, 0.41, 0.35, 0.41 long.

Variation. 6 males: total length 2.82–3.29. 2 females: total length: 2.79–2.82.

Distribution. Pará, Juruti, Brazil ( Fig. 33 ).

Figures

FIGURE 18. Masteria mutum n. sp. (male and female, MPEG 23315, MPEG 23312). A –D, male. A Eyes, dorsal view; B Embolus tip, ventral view; C Bulb, ventral view; D Prolateral processes of tibia I (left leg, prolateral view); E, F Female genitalia, dorsal view. Abbreviations: BS, basal spine; P2, Process 2; P3, Process 3. Scale bar: A 50µm; B 20µm; C 100µm; D 50µm; E, F 100µm.

FIGURE 30. Prolateral processes of leg I. A Masteria lewisi. B M. amarumayu. C M. mutum. D M. aguaruna. E M. tayrona. F M. manauara. Abbreviations: BS, basal spine; P1, Process 1; P2, Process 2; P3, Process 3. Scale bar: A 0.10 mm; B 100µm, C 50µm, D 50µm, E 50µm, F 50µm.

FIGURE 33. Distribution map of Masteria species.