Ariadna pilifera

Giroti, André Marsola & Brescovit, Antonio Domingos, 2018, The taxonomy of the American Ariadna Audouin (Araneae: Synspermiata: Segestriidae), Zootaxa 4400 (1), pp. 1-114: 44-48

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Ariadna pilifera


Ariadna pilifera  O. P.- Cambridge, 1898

Figures 27‒28View FIGURE27View FIGURE 28, 67View FIGURE67

Ariadna pilifera  O. P.- Cambridge, 1898: 235, pl. 30, fig. 9 (♀ holotype from Ventana [24°15'11"N; 106°27'10"W], Durango, Mexico, G.D. leg., deposited in NHM 1901/3/3 -78, examined).—F. O. P.- Cambridge (1899: 43).— Petrunkevitch (1911: 131).— Bonnet (1955: 732).— Beatty (1970: 461, figs 20, 31, 36-37, 40‒41).— World Spider Catalog (2018).

Ariadna acanthopus Simon, 1907: 262  , fig. 5A (♂ holotype from Guanajuato [21°01'04"N; 101°15'24"W], Guanajuato, Mexico, Dugès leg., deposited in MNHNP-AR 14381, examined).— Petrunkevitch (1911: 131).— Bonnet (1955: 730).— Beatty (1970: 461, Syn.).

Ariadna jaliscoensis Chamberlin, 1925: 212  (♀ holotype from Hacienda San Marcos, SW Jalisco [20°47'N; 104°11'W], Mexico, 11‒17.VII.1905, P.H. Goldsmith leg., deposited in MCZ 21716 (1263), examined).— Beatty (1970: 461, Syn.).

Additional material examined. MEXICO: Without specific locality: 2♀ 1imm.  , Boucard leg. ( MNHNP-AR 7047); Sonora State: 15 mi W. Yecora, 4000' [28°22'N; 108°55'W], 1♀, 7.VIII.1986GoogleMaps  , V. Roth leg. ( CAS 9039541View Materials); Hidalgo State: Jacala [21°00'19"N; 99°10'19"W], 1♀, 20.IV.1963GoogleMaps  , W.J. Gertsch & W. Ivie leg. ( NHM 1968.2.23.6); Michoacán State: Morelia [19°42'06''N; 101°11'07''W], 1♀, 22.VII.2014, D. Candiani et al. leg. ( IBSP 166770View Materials); Pátzcuaro [19°30'59''N; 101°36'35''W], 1♀, 25.VII.2014GoogleMaps  , G. Ruiz leg. ( IBSP 166769View Materials); Puebla State: Matámoros [18°32'51''N; 98°27'23''W], 1♀, 9.VIII.1942 (CNAN-Ar 0 0 7 978).GoogleMaps 

Diagnosis. Ariadna pilifera  is similar to A. bicolor  , A. comata  and A. weaveri  due to the morphology of the male palp ( Figs 13A ‒BView FIGURE 13, 28A ‒BView FIGURE 28, 42A ‒BView FIGURE 42) and macrosetae pattern of the tibia II of females, but differ by the presence of males with the metatarsi I with two conspicuous lateral conical apophyses, one on each side, bearing one macrosetae in the base of the retrolateral one, and no macrosetae on the prolateral one ( Fig. 27C ‒EView FIGURE27); females differ from A. bicolor  by the presence of a dorsal lobe shorter than the ventral lobe, from A. weaveri  by the expanded ventral lobe, and from A. comata  by the ventral lobe shorter and less sinuous ( Fig. 28C ‒DView FIGURE 28).

Description. Male (Holotype of A. acanthopus  — MNHNP-AR 14381). Carapace reddish orange. Chelicerae orange ( Fig. 27AView FIGURE27). Endites light orange; labium dark orange. Sternum orange, with darker margins, and three pairs of dark marginal areas ( Fig. 27BView FIGURE27). Palps light yellow ( Fig. 28A ‒BView FIGURE 28). Legs orange with pairs I ‒II darker. Metatarsi I ‒II reddish ( Fig. 27C ‒EView FIGURE27). Abdomen light grey ( Fig. 27A ‒BView FIGURE27). Total length 8.36; carapace 4.24 long, 2.8 wide. Chelicerae not projected ( Fig. 27AView FIGURE27). Palps: tibia slightly incrassated, with the dorso-ventral diameter less than half of the bulb; bulb rounded, mid-portion and embolus of equal lengths; embolus tubular, curved and tapered ( Fig. 28A ‒BView FIGURE 28). Legs: robust and sparsely coated with setae ( Fig. 27C ‒EView FIGURE27); tibia I with two distal ventro-retrolateral macrosetae lanceolated ( Fig. 27DView FIGURE27); tarsal brush of putative chemosensory setae present in legs I ‒IV, but reduced in pair I. Leg formula: II-I-IV-III. Leg measurements: I, femur 4.4, patella 1.52, tibia 3.12, metatarsus 3.08, tarsus 1.24, total 13.36; II, 4.12, 1.44, 3.6, 3.56, 1.12, 13.84; III, 3.08, 1.24, 2.2, 2.24, 1.0, 9.76; IV, 3.28, 1.6, 2.84, 2.44, 0.96, 11.12. Macrosetae: I, femur D0-0-0-0-0-2-0, P0-0-0-0-1-0-1/0-0; tibia P1-1-0-1-1-0-0, vp1-0-1-0-1-0- 1(slender), vr2/1-0-1-0-0-1(lanceolated/apophysis)-1(lanceolated/apophysis), R1-0-1-0-1-0-1-0; metatarsus P0-0- 1-0-0-0-0-1, vp0-0-1-1/0-1-1-0-0, vr0-0-0-0-1-0-0-1 ( Fig. 27C ‒EView FIGURE27); II, femur D0-0-0/1-1-0-2-0, P0-0-0-1-0-1-0; tibia P0-1-0-1-0-1-0-0, vp0-0-0-0-1-0-1-0, vr2-0-1-1/0-1-0-0-1, R1-1-0-0-1-1-0-0; metatarsus vp1-0-0-1-0-0-1, vr1-0-0-1-0-0-1, R0-0-1-0-0-0-0-0; IV, femur D1-1-1/0-1-1-0-0, R0-0-1-1-1-0-0; tibia vr0-0-0-0-0-0-1; metatarsus vp0-0-1-0-0-0-1, vr metatarsal comb with 3 macrosetae.

Female ( CAS 9039541). Carapace and chelicerae dark reddish brown ( Fig. 27F ‒GView FIGURE27). Endites reddish orange; labium dark reddish orange. Sternum reddish orange, with darker margins and three pairs of dark marginal areas ( Fig. 27GView FIGURE27). Palps reddish brown, gradually darkening to distal direction. Legs reddish brown, with pairs I ‒II darker ( Fig. 27H ‒IView FIGURE27). Abdomen grey ( Fig. 27F ‒GView FIGURE27). Total length 14.24; carapace 6.32 long, 4.0 wide. Carapace with wavy margins. Chelicerae not projected ( Fig. 27FView FIGURE27). Sternum as in male ( Fig. 27GView FIGURE27). Legs: robust and densely coated with setae, mainly on the ventral region of pairs I ‒III; legs I ‒II with ventro-prolateral and ventro-retrolateral tibial macrosetae of similar size, and metatarsal macrosetae of different size ( Fig. 27H ‒IView FIGURE27). Leg formula: I-II-IV-III. Leg measurements: I, femur 4.92, patella 2.16, tibia 3.52, metatarsus 3.28, tarsus 0.96, total 14.84; II, 4.56, 2.2, 3.8, 3.28, 0.96, 14.8; III, 3.84, 1.84, 2.64, 2.48, 0.88, 11.68; IV, 4.36, 2.24, 3.48, 2.72, 0.88, 13.68. Macrosetae: I, femur D0-0-0-0-0-2-0, P0-0-0-0-2-1-0; tibia P1/0-1-0-1-0-1/0-0, vp1-0-1-0-1-0-1, vr1-0-1-0-1-0-1, R0-0-1-0-0-0-0; metatarsus vp1-1-1-1-1-1-1-1, vr1-1-1-1-1-1-1-1 ( Fig. 27H ‒IView FIGURE27); II, femur D0-0-0-0-0-2-0, P0-0-0-0-1-1-0; tibia P0- 1-0-1-0-1-0, vp0-0-0-0-1-0-1, vr1-0-1-1/0-1-0-1; metatarsus vp1-1/0-1-1/0-1-1/0-1-1-1-1, vr1-1-0-1-0-1-1-1-1-1- 1; IV, femur D1-0-0-0-0-0-0, R0-0-0-1-1/0-1-0; metatarsus vp0-0-0-0-0-0-1, vr metatarsal comb with 3-4 macrosetae. Internal genitalia: anterior receptaculum with glandular ducts plate with the proximal region expanded ( Fig. 28C ‒DView FIGURE 28).

Variation. Female (n=9): total length 11.65‒18.48; carapace 5.0‒7.88 long, 3.0‒4.64 wide; femur I 3.65‒5.6.

Distribution. Central and northwestern Mexico ( Fig. 67View FIGURE67).


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Ariadna pilifera

Giroti, André Marsola & Brescovit, Antonio Domingos 2018

Ariadna jaliscoensis Chamberlin, 1925 : 212

ChamBerlin 1925: 212

Ariadna acanthopus

Simon 1907: 262

Ariadna pilifera

O. Pickard-Cambridge 1898