Arctosa pacaya Paredes-Munguía & Brescovit & Teixeira 2024, sp. nov.
Creators: name: Paredes-Munguía, Williams
name: Brescovit, Antonio D.
name: Teixeira, Renato A.
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Lycosidae
Arctosa
Arctosa pacaya

description: 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).
description: Published as part of 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, pp. 1-83 in Zootaxa 5414 (1) on pages 31-35, DOI: 10.11646/zootaxa.5414.1.1, http://zenodo.org/record/10681263