Arctosa ayaymama, 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 : 8

publication ID	https://doi.org/ 10.11646/zootaxa.5414.1.1
publication LSID	lsid:zoobank.org:pub:3B1DFADA-C20E-473B-A5E9-843548B54AD3
DOI	https://doi.org/10.5281/zenodo.10681556
persistent identifier	https://treatment.plazi.org/id/03E887D2-BA0A-FE2B-FDDB-FF19611AF86B
treatment provided by	Plazi
scientific name	Arctosa ayaymama
status	sp. nov.

Treatment

Arctosa ayaymama sp. nov.

Figs 2b View FIGURE 2 , 3‒5 View FIGURE 3 View FIGURE 4 View FIGURE 5 , 62 View FIGURE 62

Type Material. Female holotype from Yuracyacu, 5°56'34.11"S 77°08'53.44"W, 805 m, 7.ix.2008, Moyobamba, San Martín, Peru, W. Paredes & C. Albujar leg. ( MUSM-ENT 500411 ). Female paratype, near the same locality, 5°54'06.42"S 77°11'18.92"W, 816 m, 11.ix.2008. C. Albujar leg. ( MUSM-ENT 505143 ) GoogleMaps .

Other material examined. COLOMBIA: Caquetá: 1♀, Curillo, Vereda El Conquistador, Laguna la Cocha , ca. 1°20'16"N 75°54'49.7"W, 226 m, F. Arcos-Valencia leg. ( LEUA 88163 ) GoogleMaps . PERU: San Martín: 1♀, Moyobamba, Yuracyacu , 5°54'6.42"S 77°11'18.92"W, 816 m, 11–12.ix.2008, C. Albujar leg. ( MUSM-ENT 500358 ) GoogleMaps ; 4♀, ditto, 11.ix.2008, C. Albujar leg. ( MUSM-ENT 506993 ) GoogleMaps .

Etymology. The species name comes from a Peruvian Amazon folk tale. In this story, one stepmother in the middle of the jungle abandoned two stepsons, and their lament is heard on moonlit nights looking for his dead biological mother. The sound of these children's wailing is folklorically known as "ayaymama ".

Diagnosis. Females of A. ayaymama can be recognized among all Neotropical species of Arctosa by the clearly triangular median septum ( Figs 3a View FIGURE 3 , 4d View FIGURE 4 ), like in Arctosa tenebrosa comb. nov., but with a deeper hood in A. ayaymama ( Fig. 3b View FIGURE 3 ). Likewise, A. ayaymama can be distinguished by the longitudinal median band (LMB) of the carapace covered by white setae ( Fig. 4a View FIGURE 4 ) and by the pyriform-shaped head of the spermatheca (HS), which narrows anteriorly ( Figs 3b View FIGURE 3 , 5b View FIGURE 5 ).

Description. Male. Unknown.

Female. Holotype (MUSM-ENT 500411). Carapace brown with black radial pattern, covered with tiny black setae. Longitudinal median band dark orange, covered by white setae, and tapering towards the opisthosoma ( Fig. 4a, e View FIGURE 4 ), submarginal bands pale. Ocular area light orange, covered by sparse white setae ( Fig. 4f View FIGURE 4 ). Sternum yellow, sparsely covered by long brown setae, labium pale brown. Anterior row of eyes procurved, shorter than the middle row, anterior median eyes larger than anterior lateral eyes ( Fig. 4f View FIGURE 4 ). Chelicerae brown, darker than the endites and labium ( Fig. 4c View FIGURE 4 ), and condyle short. Legs, dorsum of femora yellowish with black annuli, patellae, tibiae, and metatarsi yellowish with black annuli; tarsi yellow, with no annuli ( Fig. 4e View FIGURE 4 ). A sparse scopulae on legs I−II, absent in III− IV. Spinules present only on tarsi III−IV. All tibiae, metatarsi, and tarsi with trichobothria increasing in size distally. Opisthosoma dark dusky with arrow-shaped cardiac mark flanked by yellow bands, covered by tiny white setae, with an irregular yellow median band, distal portion with a chevron yellow pattern ( Fig. 4a View FIGURE 4 ). Venter yellow as the sternum with a dusky irregular band of spots. Spinnerets yellow.

Genitalia ( Figs2b View FIGURE 2 , 3a‒d View FIGURE 3 , 4b,d View FIGURE 4 ) with median and transversal septum of epigyne not distinguishable from each other in ventral view, TS with rounded lateral borders; atrium narrow, MS not depressed. Fertilization ducts membranous and fusiform ( Fig. 3b View FIGURE 3 ). Copulatory ducts narrow. Spermatheca with stalk broad and curved outward, quite as thick as the base of spermatheca; head of spermatheca pear-shaped, narrowing anteriorly visible in posterolateral view ( Fig. 3d View FIGURE 3 ).

Leg formula IV>I>II>III. Spination pattern: femur I p 0-0-2 d 1-1-1 r 0-d1-1ap, II r 0-d1-d1 d 1-1-1, r 0-d1-d1 III p 0-d1-d1 d 1-1-1 r 1-1-1, IV p d1-0-d1 d 1-1-1 r 0-0-1; patella I p 1 d 1bristle-1 bristle r 1, II p 1 d 1 bristle – 1 bristle r 1, III p 1 r 1 d 1-1bristle ap, IV p 1 r 1 d 1bristle - 1ap; tibia I p 1-v1 r 0-1-1 v 2-2-2ap, II p d1-1 r 1-1 v 2-2-2ap III, p 1-1 d 1-1 r 1-1 v 1-2-2ap, IV p 1-v1 d 1-1 r 1-1 v1 -2-2ap; metatarsus I p 0-1-1ap r 0-1-2ap v 2-2-1ap, II p 1-1-2ap r 0- 1-2ap v 2-2-1ap, III p 1-1-2ap r d1-1-2ap v 2-2-1ap, IV p d1-d1-2ap r d1-v1-d1-0-2ap v 2-2-1ap.

Measurements: TL 5.90, CL 2.80, CCW 1.64, CTW 2.50, CCH 1.24, CTH 1.32. Eyes: AME 0.20, ALE 0.10, PME 0.38, PLE 0.30, interdistances: AME–AME 0.12, AME–ALE 0.08; PME–PME 0.30, PME–PLE 0.38, PLEPLE 0.88, POQ length 0.66, POQ posterior width 1.04, POQ anterior width 0.60. Anterior eye row procurved, as long as the PMEs. Chelicerae: 1.18 length. Opisthosoma: length 2.76, width 1.98. Legs: length of segments (femur + patella+tibia + metatarsus+tarsus = total length): pedipalp 1.10 + 0.56 + 0.80 + - + 0.90 = 3.36, I 2.30 + 1.10 + 1.94 + 1.78 + 1.22 = 8.34, II 2.10 + 0.98 + 1.68 + 1.66 + 1.16 = 7.58, III 2. 00 + 0.82 +1.54 + 2.02+1.10 = 7.48, IV 2. 68 + 1.10 + 2. 38 + 3.20+1.48 = 10.84.

Variation. Females (N = 6, range, mean±s.d.): TL 5.67–7.92, 6.51±0.33; CL 3.00–3.67, 3.31±0.09; CW 2.17– 2.58, 2.46±0.06.

Distribution. Amazonian Colombia (Caquetá) and Peru (San Martín) ( Fig. 62 View FIGURE 62 ).