Ariadna pilifera, O. Pickard-Cambridge, 1898

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

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 ).

Figures

FIGURE 13. Ariadna bicolor (Hentz, 1842). Male from Hyattsville (USNM) (A‒B): Left palp, prolateral (A) and retrolateral view (B). Female from Sierra Laguna (CAS 9039538) (C‒D): Internal genitalia, lateral view (C); Anterior receptaculum, ventral view (D).

FIGURE 28. Ariadna pilifera O. P.-Cambridge, 1898. Male from Guanajuato (MNHNP-AR 14381) (A‒B): Left palp, prolateral (A) and retrolateral view (B). Female from Mexico (MNHNP-AR 7047) (C‒D): internal genitalia, lateral view (C); Anterior receptaculum, ventral view (D). Scale bar:1mm.

FIGURE 42. Ariadna weaveri Beatty, 1970. Male (Paratype) from Clarion Island (AMNH) (A‒B): Right palp, prolateral (A) and retrolateral view (B). Female (Paratype) from Clarion Island (AMNH): Internal genitalia, lateral view (C); Anterior receptaculum, ventral view (D). Scale bar:1mm.

FIGURE27.Ariadna piliferaO.P.-Cambridge, 1898.Male from Guanajuato(MNHNP-AR14381) (A‒E):Habitus, dorsal(A) and ventral view (B); Right leg I, prolateral (C) and retrolateral view (D), arrowheads = lanceolated macrosetae; Right metatarsus I, ventral view (E). Female from 15 mi W. Yecora (CAS 9039541) (F‒I): Habitus, dorsal (F) and ventral view (G); Left leg I, prolateral (H)and retrolateral view (I). Scale bar: 1mm.

FIGURE67.Locality of thespecimens of A.bicolor, A.pilifera, A.comata, A.perkinsi and A.weaveri examinedin the present study.