Ariadna pilifera O. Pickard-Cambridge 1898
Creators: name: Giroti, André Marsola
name: Brescovit, Antonio Domingos
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Segestriidae
Ariadna
Ariadna pilifera

description: Ariadna pilifera O. P.- Cambridge, 1898
Figures 27‒28, 67
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.1986, V. Roth leg. (CAS 9039541); Hidalgo State: Jacala [21°00'19"N; 99°10'19"W], 1♀, 20.IV.1963, 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 166770); Pátzcuaro [19°30'59''N; 101°36'35''W], 1♀, 25.VII.2014, G. Ruiz leg. (IBSP 166769); Puebla State: Matámoros [18°32'51''N; 98°27'23''W], 1♀, 9.VIII.1942 (CNAN-Ar 0 0 7 978).
Diagnosis. Ariadna pilifera is similar to A. bicolor, A. comata and A. weaveri due to the morphology of the male palp (Figs 13A‒B, 28A‒B, 42A‒B) 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‒E); 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‒D).
Description. Male (Holotype of A. acanthopus —MNHNP-AR 14381). Carapace reddish orange. Chelicerae orange (Fig. 27A). Endites light orange; labium dark orange. Sternum orange, with darker margins, and three pairs of dark marginal areas (Fig. 27B). Palps light yellow (Fig. 28A‒B). Legs orange with pairs I‒II darker. Metatarsi I‒II reddish (Fig. 27C‒E). Abdomen light grey (Fig. 27A‒B). Total length 8.36; carapace 4.24 long, 2.8 wide. Chelicerae not projected (Fig. 27A). 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‒B). Legs: robust and sparsely coated with setae (Fig. 27C‒E); tibia I with two distal ventro-retrolateral macrosetae lanceolated (Fig. 27D); 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‒E); 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‒G). Endites reddish orange; labium dark reddish orange. Sternum reddish orange, with darker margins and three pairs of dark marginal areas (Fig. 27G). Palps reddish brown, gradually darkening to distal direction. Legs reddish brown, with pairs I‒II darker (Fig. 27H‒I). Abdomen grey (Fig. 27F‒G). Total length 14.24; carapace 6.32 long, 4.0 wide. Carapace with wavy margins. Chelicerae not projected (Fig. 27F). Sternum as in male (Fig. 27G). 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‒I). 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‒I); 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‒D).
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. 67).
description: Published as part of Giroti, André Marsola & Brescovit, Antonio Domingos, 2018, The taxonomy of the American Ariadna Audouin (Araneae: Synspermiata: Segestriidae), pp. 1-114 in Zootaxa 4400 (1) on pages 44-48, DOI: 10.11646/zootaxa.4400.1.1, http://zenodo.org/record/1207641