Ariadna cephalotes Simon, 1907

Giroti, André Marsola & Brescovit, Antonio Domingos, 2018, The taxonomy of the American Ariadna Audouin (Araneae: Synspermiata: Segestriidae), Zootaxa 4400 (1), pp. 1-114 : 57-59

Ariadna cephalotes Simon, 1907

Figures 34‒35 , 69

Ariadna cephalotes Simon, 1907: 262 (♀ lectotype and immature lectoparatype from San Mateo, BoliVia [16°19'40"S; 59°36'52"W], Garlepp leg., deposited in MNHNP-AR 14384 and 14385, respectively, designated by Beatty (1970), examined).— Petrunkevitch (1911: 131).— Bonnet (1955: 732).— Beatty (1970: 465, fig. 11).— Grismado (2008: 353, figs 8J‒K, 9E‒F).— World Spider Catalog (2018).

Ariadna hotchkissi Chamberlin, 1916: 216 , pl. 10, figs 4‒5 (Immature holotype from Lucma, Cuzco, Peru, 7100ft. (2130m), 1.VIII.1911, H.W. Foote & Y.P. Exp. leg., deposited in MCZ 15693, not examined).— Beatty (1970: 465, Syn.).

Additional material examined. PERU: Apurimac Department: 37km S. of Andahuaylas [13°39'27"S; 73°23'00"W], 1♀ 3imm., 6.III.1951, Ross & Michelbacher leg. ( AMNH) ; Junín Department: Tarma [11°25'11"S; 75°41'27"W], 3200m , 4♀ 8imm., 14.II.1965, H. Levi leg. (MCZ 46059; 46062); Tarma, 3100m, 3♀, 11‒12.II.1965, H. Levi leg. ( MCZ 46063); Cochas Bajo [11°25'20"S; 75°46'10"W], 11km W of Tarma, 3600m , rock ledge in agricultural valley, 2♀ 2imm., 29.III.1988, J. Palmer leg. (MCZ 40718); BOLIVIA: La Paz Department: La Paz, Vale do Zongo, Sainani [16°06'S; 68°04'W], 1♂ 2imm., 4.VIII.1993, H. Höfer leg. ( MCN 24097) ; La Paz, La Cumbre [16°20'S; 68°01'W], 1♀, 2.VIII.1993, A.D. Brescovit & H. Höfer leg. ( MCN 24072) ; La Paz, Laguna Viscachani [17°13'S; 69°36'W], 4♀, 5.VIII.1993, A.D. Brescovit leg. ( MCN 23 865) ; La Paz, Vale do Zongo, Laguna Viscachani , 2♀, 5.VIII.1993, H. Höfer leg. ( MCN 24100) ; La Paz, Vale do Zongo, Laguna Viscachani , 3660m, 4♀ 4imm., 5.VIII.1993, A.D. Brescovit & H. Höfer leg. ( SMNK-ARA 1376 ) ; La Paz, Laguna Viscachani , 3660m, 1♀, 5.VIII.1993, A.D. Brescovit leg. ( SMNK-ARA 1398 ) ; Botijlaca [16°12'56"S; 68°06'58"W], 3600m , 3♀, 2.XI.1984, L.E. Peña leg. (AMNH); Songotal, 3800m, 1♂ 7♀ 5imm., 30.II.1953, Forster & Schlinder leg. (AMNH); Cochabamba Department: Cochabamba, Escola de Agronomia, Next to Ivirganzama , 215m (17°06'17,3"S; 64°46'56,5"W), 1♀, 8.XII.2010, R. Pinto-da-Rocha et al. leg. ( MZSP 68118 ) ; Morochata [17°14'04"S; 66°31'56"W], 1♀, 10.X.1983, A. Roig leg. (MACN-Ar 10123) ; ARGENTINA: Jujuy Department: Calilegua National Park [23°55'S, 64°50'W], near Sevenguillar, 3km up to Mesada de las Colmenas , c. 1600m, 1♀, 7.VIII.1997, M. Ramírez & L. Compagnucci leg. (MACN-Ar 10120).

Diagnosis. Ariadna cephalotes is similar to A. boliviana due to the morphology of the male metatarsi I, with short ventro-prolateral macrosetae ( Figs 34C‒E , 36C‒E ), and tibiae I‒II macrosetae pattern of females, but differ by the male palp with short embolus with a basal anterior keel ( Fig. 35A‒B ); females differ by the presence of an anterior receptaculum with the dorsal lobe with enlarged tip, and ventral lobe depressed ventrally ( Fig. 35C‒D ).

Note. Although Grismado's drawing (2008: figs 8J‒K) show the dorsal lobe with a less enlarged tip that the specimen we present in this study ( Figs 35C‒D ), both specimens present the ventral lobe depressed ventrally.

Description. Male (MCN 24097). Carapace and chelicerae brownish orange ( Fig. 34A ). Endites orange; labium dark orange. Sternum orange with darker margins, and marbled with dark pigment ( Fig. 34B ). Palps light orange ( Fig. 35A‒B ). Legs orange, with pairs I‒II darker and dark pigment forming diffuse rings in the distal region of femur, patella, tibia, metatarsi and tarsi ( Fig. 34C‒E ). Abdomen grey ( Fig. 34A‒B ). Total length 6.24; carapace 2.72 long, 2.08 wide. Palps: tibia incrassated, with the dorso-ventral diameter shorter than the bulb; bulb rounded, mid-portion and embolus with equal lenghts; embolus tubular and curved abruptly ( Fig. 35A‒B ). Legs: robust and coated with setae ( Fig. 34C‒E ); tarsal brush of putative chemosensory setae present in legs I‒III, but reduced in pair I. Leg formula: I-II-IV-III. Leg measurements: I, femur 2.68, patella 1.08, tibia 2.16, metatarsus 2.4, tarsus 0.8, total 9.12; II, 2.56, 1.08, 2.28, 2.32, 0.76, 9.0; III, 2.0, 0.88, 1.44, 1.52, 0.64, 6.48; IV, 2.32, 1.04, 1.76, 1.72, 0.64, 7.48. Macrosetae: I, femur D0-0/1-0-1-0-2-0, P0-0-0-2-0-1/0-0; tibia P0-1-0-1-0-1-0, vp1-0-1-0-1-0-1, vr2-0-1-0-1-0-1, R1-0-1-0-1-0-1-0; metatarsus p0-1(blunt)/0-0-0-0-0-0, vp1-0-0-1(blunt)-0-0-1(blunt), vr0-0-0-1- 0-0-1, r0-1(blunt)-1(blunt)-0-0-0-0 ( Fig. 34C‒E ); II, femur D0-1-0-1-0-1-0-2-0, P0-0-0-0-0-0-1-1-0; tibia P0-0-0- 1-0-1-0, vp0-0-0-0-0-1-1, vr2-0-1-0-1-0-1, R1-0-1-0-1-1-1-0; metatarsus vp1-0-0-1-0-0-1, vr1-0-0-1-0-0-1, r0-1-0- 1-1-0-0; IV, femur D0-1-1-1-1-1-0/1-0-0, R0-0-0-0-0-0-0-1/0-0; tibia vr0-0-0-0-0-0-1, r0-0-0-0-0-0/1-0; metatarsus vp0-0-0-0-1-0-2, vr metatarsal comb with 4 macrosetae.

Female (MCN 23865). Carapace and chelicerae reddish orange ( Fig. 34F ). Endites orange; labium reddish orange. Sternum orange with darker margins, marbled with dark pigment, and three pairs of dark marginal areas, the hind one fainted ( Fig. 34G ). Palps reddish orange, gradually darkening to distal direction ( Figs 34F‒G ). Legs orange, with pairs I‒II darker and with dark pigment forming diffuse rings in the distal region of the tibia, metatarsus and tarsus ( Fig. 34H‒I ). Abdomen as in male ( Fig. 34F‒G ). Total length 10.4; carapace 4.36 long, 3.04 wide. Carapace with cephalic region elevated ( Fig. 34F ). Legs: robust and densely coated with setae; legs I‒II with ventro-prolateral and ventro-retrolateral tibial macrosetae of similar size, and metatarsal macrosetae of different sizes ( Fig. 34H‒I ). Leg formula: I-II-IV-III. Leg measurements: I, femur 3.28, patella 1.6, tibia 2.56, metatarsus 2.4, tarsus 0.8, total 10.64; II, 3.12, 1.56, 2.6, 2.36, 0.76, 10.4; III, 2.44, 1.24, 1.72, 1.68, 0.68, 7.76; IV, 2.96, 1.6, 2.24, 1.96, 0.72, 9.48. Macrosetae: I, femur p0-0-0-0-0-1-0; tibia vp1-0-1-0-1-0-1, vr1-0-1-0-1-0-1, r0-1-0-0-0-0-0; metatarsus vp1-1-1-0/1-1-1-1-1-1-1, vr1-1-1-1-1-1-1-1-1 ( Fig. 34H‒I ); II, tibia vp0-0-1-0-1-0-1, vr1-0-1-0-1-0-1; metatarsus vp1-1-1-1-0/1-1-1-1-1-1-1, vr1-1-1-1-1-1-1/0-1-1-1/0-1; IV, metatarsus vp0-0-0-0-0-0-1, vr metatarsal comb with 5 macrosetae. Internal genitalia: anterior receptaculum with the glandular ducts plate in the median region ( Fig. 35C‒D ).

Variation. Males (n=2): Total length 6.24‒7.2; carapace 2.72‒3.5 long, 2.08‒2.6 wide; femur I 2.68‒3.35. Female (n=10): Total length 7.7‒13.6; carapace 3.4‒4.65 long, 2.3‒3.1 wide; femur I 2.35‒3.4. Distribution. Center of Bolivia, center of Peru, and northwestern of Argentina ( Fig. 69 ).

Figures

FIGURE 35. Ariadna cephalotes Simon, 1907. Male from Vale do Zongo (MCN 24097) (A‒B): left palp, prolateral view (A). and retrolateral view (B) (arrowhead = basal anterior keel). Female from La Cumbre (MCN 24072) (C‒D): internal genitalia, lateral view (C); anterior receptaculum, ventral view (D). Scale bar: 1mm.

FIGURE 36. Ariadna boliviana Simon, 1907. Male from Morrinhos (IBSP 152775) (A‒F): habitus, dorsal (A) and ventral view (B); right leg I, prolateral (C) and retrolateral view (D); right metatarsi I, ventral view (E); left metatarsi IV, retrolateral view (F). Female from Parauapebas (IBSP 193500) (G‒J): habitus, dorsal (G) and ventral view (H); right leg I, prolateral (I) and retrolateral view (J). Scale bar:1mm.

FIGURE 69. Locality of the specimens of A. tarsalis, A. cephalotes, A. calilegua, A. changellkuk and A. abrilae examined in the present study.

FIGURE34.Ariadna cephalotes Simon, 1907.Male from Vale do Zongo(MCN 24097) (A‒E):habitus,dorsal (A) and ventral (B); left leg I, prolateral (C) and retrolateral view (D); right metatarsus I, ventral view (E). Female from Laguna Viscachani (MCN 23865) (F‒I): habitus, dorsal (F) and ventral view (G); right leg I, prolateral (H) and retrolateral view (I). Scale bar: 1mm.