Arctosa pacaya, Paredes-Munguía & Brescovit & Teixeira, 2024

Paredes-Munguía, Williams, Brescovit, Antonio D. & Teixeira, Renato A., 2024, Revision of Neotropical wolf spider genus Arctosa C. L. Koch, 1847 (Araneae: Lycosidae), with description of seven new species, Zootaxa 5414 (1), pp. 1-83 : 31-35

Arctosa pacaya sp. nov.

Figs 24‒27 , 62

Type Material. Male holotype from Pithecia, 5°06'S 74°50'W, 100 m, 11.viii.1989, Parque Nacional Pacaya Samiria, Loreto, Peru, D. Silva D. leg ( MUSM-ENT 505356 ) .

Etymology. The species epithet is dedicated to the Pacaya Samiria Natural Reserve (PSNR), a protected natural wetland area. PSNR is the biggest protected flooded forest in the Peruvian Amazon, the biggest RAMSAR site in Peru, and serves as habitat to 25% of the bird fauna reported from Peru ( Isola 2007).

Diagnosis. Males of Arctosa pacaya resemble Arctosa sapiranga in dorsal pattern of habitus but can be recognized by the wider carapace and the tibia/metatarsus I and II whitish ( Fig. 26a, c ); the male palpus of A. pacaya have the embolus twisted once in the middle part ( Fig. 25b ), and a T-shaped posterior arm (Pa) of the median apophysis ( Figs 24a, c ).

Description. Female. Unknown.

Male. Holotype (MUSM-ENT 505356). Dorsum of Prosoma light brown sparsely covered with tiny black setae and a pale yellow longitudinal median band tapering to fovea; non-recognizable submarginal bands ( Fig. 26a ), four long black bristles on the clypeal condyle. Ocular area is the same color as the longitudinal median band, covered by a sparse white seta. First row of eyes procurved and shorter than the second row; AME slightly bigger than ALE; ALE resting on tubercles distally oriented; PME separated by more than half the length of its radii. anterior to AER. Sternum yellow sparsely covered with brown bristles ( Fig. 26b ). Labium yellow covered with brown bristles, border of the labium and endite clearer than the base; chelicerae dark brown, darker than the endites and labium. Condyle short and poorly notorious, pointed bulge in the outer margin of the cheliceral claw ( Fig. 25i ). Legs yellow, becoming lighter distally. All femora are yellow with dusky irregular patches; only the leg I white from tibiae to tarsi ( Fig. 26c ). All tarsi with no scopula, spinules on tarsi III and IV; trichobothria in tibiae, tarsi and metatarsi distally increasing in size. Opisthosoma dorsal and lateral shield olive gray; a broad yellow longitudinal band runs along the spinnerets finishing in not defined chevron pattern stripes, long black bristles in the yellow band; venter yellow with some irregular dusky patches; spinnerets yellow.

Pedipalp ( Figs 25a‒h , 26d, e , 27 ) femora slightly curved in the dorsal view. Cymbium with a short but strong subterminal spine in the apical area ( Fig. 26d ). Sperm duct crossing the tegulum in a C-shaped pathway, subtegulum visible and bowl shaped ( Figs 25b, d ). In ventral view, Median apophysis with an evident posterior arm T-shaped ventrally projected ( Figs 25b, e , 27c ). The basal portion of the terminal apophysis is more sclerotized than the distal and ribbed with its distal part sharpened ( Figs 24a , 25b ). Embolus is fusiform, sclerotized, and twisted once in its median part ( Figs 25b, e , 27a ).

Leg formula IV>I>II>III. Spination pattern: femur I p 0-0-2 d 1-1-1 r 0-1-1, II p 0-0-2 d 1-1-1 r 0-1-1, III p 0-1-1 d 1-1-1 r 0-1-1, IV p 1-0-1 d 1-1-1 r 0-0-1; patella I p 1 d 1bas-1ap r 1, II p 1 d 1bas-1ap r 1, III p 1 d 1bas-1ap r 1, IV p 1 d 1bas-1ap r 1; tibia I p 1-1v v 2-2-2ap r 1-1v, II p 1-1 d 1-(1 bristle) r 1-1 v 2-2-2ap III, p d1-1 d 1-1 r 1-1 v 2 - 2-2ap, IV p 1-1 d 1-1 r d 1-1 v 2-2-2ap; metatarsus I p 0-1-2ap r 0-12ap v 2-2-1ap, II p 0-1-2ap r 0-1-2ap v 2-2-1ap, III p 1d-1d r 1d-1v-1d-0-1ap v 2-2-1ap, IV p 1d-1d-2ap r 1d-1v-1d-0-2ap v 2-2-1ap.

Measurements: TL 4.92, CL 2.83, CCW 2.14, CTW 1.22, CCH 1.10, CTH 1.16. Eyes: AME 0.50, ALE 0.33, PME 1.50, PLE 0.26, interdistances: AME-AME 0.50, AME-ALE 0.33; PME-PME 0.24, POQ length 0.58, POQ posterior width 0.90, POQ anterior width 0.56. Chelicerae: 0.92 length. Opisthosoma: length 2.17, width 1.33. Legs: length of segments femur + patella+tibia + metatarsus + tarsus = total length: pedipalp 1.16 + 0.60 + - + 0.82 + 1.00 = 3.58, I 2.00 + 0.80 + 1.70 + 1.64+1.08 = 7.22, II 1.80 + 0.82 + 1.52 + 1.56+1.02 = 6.72, III 1.76 + 0.66 +1.30 + 1.66+0.92 = 6.30, IV 2. 40 + 0.92 + 2. 10 + 2.74+1.30 = 9.46.

Distribution. Known only for the type locality, Loreto, Peru ( Fig. 62 ).

Figures

FIGURE 24. Arctosa pacaya sp. nov. Holotype male pedipalp (MUSM-ENT 505356) a–c (a, ventral; b, retrolateral; c, anterior). Scale bars: a–c, 0.25 mm. CMS cymbium macrosetae, Pa posterior arm, Ra retrolateral arm, TA terminal apophysis.

FIGURE 25. Arctosa pacaya sp. nov. Male pedipalp (MUSM-ENT 505356) a–c (a, retrolateral; b, ventral; c, prolateral). Pedipalp bulb d–f, h (d, retrolateral; e, ventral; f, prolateral; h, anterior). g, apical cymbium setae, i, protuberance on male chelicerae. Scale bars: a–c, 0.2 mm, d–h, 100 µm, i, 125 µm. C conductor, DMA depresion of median apophysis, E embolus, P palea, Pa posterior arm, SD seminal duct, ST subtegulum, T tegulum, TA terminal apophysis.

FIGURE 26. Arctosa pacaya sp. nov. Male habitus (MUSM-ENT 505356) a–c (a, dorsal; b, ventral; c, lateral). Pedipalp, expanded d, e (d, prolateral; e, anterior). Scale bars: a–c, 1 mm, d, e, 200 µm. BH basal hematodocha, CMS cymbial macrosetae, DH distal hematodocha, E embolus, Pa posterior arm, SD seminal duct, ST subtegulum, T tegulum, TA terminal apophysis.

FIGURE 27. Arctosa pacaya sp. nov. Male pedipalp SEM (MUSM-ENT 505356) a–c (a, ventral; b, TA detail; c, Pa detail). Scale bars: a, 150 µm, b, 100 µm, c, 50 µm. C conductor, E embolus, MA median apophysis, P palea, Pa posterior arm, Ra retrolateral arm, ST subtegulum, T tegulum, TA terminal apophysis.

FIGURE 62. Geographic distribution records of Arctosa ayaymama sp. nov. (blue dot), Arctosa pacaya sp. nov. (red dot), Hogna andina comb. nov. (orange dot).