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

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Ariadna cephalotes Simon, 1907


Ariadna cephalotes Simon, 1907 

Figures 34‒35View FIGURE34View FIGURE 35, 69View FIGURE 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)GoogleMaps  ; Junín Department: Tarma [11°25'11"S; 75°41'27"W], 3200mGoogleMaps  , 4♀ 8imm., 14.II.1965, H. Levi leg. (MCZ 46059; 46062); Tarma, 3100m, 3♀, 11‒12.II.1965, H. Levi leg. ( MCZ 46063View Materials); Cochas Bajo [11°25'20"S; 75°46'10"W], 11km W of Tarma, 3600mGoogleMaps  , 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 24097View Materials)GoogleMaps  ; La Paz, La Cumbre [16°20'S; 68°01'W], 1♀, 2.VIII.1993, A.D. Brescovit & H. Höfer leg. ( MCN 24072View Materials)GoogleMaps  ; La Paz, Laguna Viscachani [17°13'S; 69°36'W], 4♀, 5.VIII.1993, A.D. Brescovit leg. ( MCN 23View Materials 865)GoogleMaps  ; La Paz, Vale do Zongo, Laguna Viscachani , 2♀, 5.VIII.1993, H. Höfer leg. ( MCN 24100View Materials)  ; 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], 3600mGoogleMaps  , 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 68118View Materials)GoogleMaps  ; Morochata [17°14'04"S; 66°31'56"W], 1♀, 10.X.1983, A. Roig leg. (MACN-Ar 10123)GoogleMaps  ; 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).GoogleMaps 

Diagnosis. Ariadna cephalotes  is similar to A. boliviana  due to the morphology of the male metatarsi I, with short ventro-prolateral macrosetae ( Figs 34C ‒EView FIGURE34, 36C ‒EView FIGURE 36), and tibiae I ‒II macrosetae pattern of females, but differ by the male palp with short embolus with a basal anterior keel ( Fig. 35A ‒BView FIGURE 35); females differ by the presence of an anterior receptaculum with the dorsal lobe with enlarged tip, and ventral lobe depressed ventrally ( Fig. 35C ‒DView FIGURE 35).

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 ‒DView FIGURE 35), both specimens present the ventral lobe depressed ventrally.

Description. Male ( MCN 24097View Materials). Carapace and chelicerae brownish orange ( Fig. 34AView FIGURE34). Endites orange; labium dark orange. Sternum orange with darker margins, and marbled with dark pigment ( Fig. 34BView FIGURE34). Palps light orange ( Fig. 35A ‒BView FIGURE 35). 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 ‒EView FIGURE34). Abdomen grey ( Fig. 34A ‒BView FIGURE34). 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 ‒BView FIGURE 35). Legs: robust and coated with setae ( Fig. 34C ‒EView FIGURE34); 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 ‒EView FIGURE34); 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 23865View Materials). Carapace and chelicerae reddish orange ( Fig. 34FView FIGURE34). 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. 34GView FIGURE34). Palps reddish orange, gradually darkening to distal direction ( Figs 34F ‒GView FIGURE34). 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 ‒IView FIGURE34). Abdomen as in male ( Fig. 34F ‒GView FIGURE34). Total length 10.4; carapace 4.36 long, 3.04 wide. Carapace with cephalic region elevated ( Fig. 34FView FIGURE34). 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 ‒IView FIGURE34). 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 ‒IView FIGURE34); 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 ‒DView FIGURE 35).

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. 69View FIGURE 69).


Universit� di Perugia


American Museum of Natural History


Museum of Comparative Zoology


McNeese State University














Ariadna cephalotes Simon, 1907

Giroti, André Marsola & Brescovit, Antonio Domingos 2018

Ariadna hotchkissi

Chamberlin 1916: 216

Ariadna cephalotes

Simon 1907: 262