Ariadna weaveri Beatty, 1970

Giroti, André Marsola & Brescovit, Antonio Domingos, 2018, The taxonomy of the American Ariadna Audouin (Araneae: Synspermiata: Segestriidae), Zootaxa 4400 (1), pp. 1-114: 70-71

publication ID 10.11646/zootaxa.4400.1.1

publication LSID

persistent identifier

treatment provided by


scientific name

Ariadna weaveri Beatty, 1970


Ariadna weaveri Beatty, 1970 

Figures 41‒42View FIGURE 41View FIGURE 42, 67View FIGURE67

Ariadna weaveri Beatty, 1970: 464  , figs 50, 53, 56. (♂ holotype from Clarion Island [18°22'N; 114°44'W], ReVillagigedo Islands, Mexico, 7‒8.V.1955, McDonald & Blodget leg., deposited in AMNH, not examined. Paratype: 1♂ 6♀, same data from holotype, deposited in AMNH, examined).— World Spider Catalog (2018).

Diagnosis. Ariadna weaveri  is similar to A. bicolor  , A. comata  and A. pilifera  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 nearly straight, without macrosetae or apophyses ( Fig. 41C ‒EView FIGURE 41); females differ by presenting two lobes with similar sizes and sinuous, not expanded ( Fig. 42C ‒DView FIGURE 42).

Description. Male (Paratype). Carapace and chelicerae orange ( Fig. 41AView FIGURE 41). Endites yellow; labium dark yellow. Sternum light orange, with darker margins, and marbled with darker pigment ( Fig. 41BView FIGURE 41). Palps light yellow ( Fig. 42A ‒BView FIGURE 42). Legs yellow, with pairs I ‒II darker ( Fig. 41C ‒EView FIGURE 41). Abdomen grey, dorsal and ventrally, lighter laterally ( Fig. 41A ‒BView FIGURE 41). Total length 5.16; carapace 2.04 long, 1.52 wide. Chelicerae projected ( Fig. 41AView FIGURE 41). Palps: tibia slightly incrassated, with the dorso-ventral diameter less than half of the bulb; bulb rounded, mid-portion curved and slightly shorter than the embolus; embolus tubular and thickened; ( Fig. 42A ‒BView FIGURE 42). Legs: slender and sparsely coated with setae ( Fig. 41C ‒EView FIGURE 41); tarsal brush of putative chemosensory setae present on legs II ‒IV, but reduced on pair II. Leg formula: I-II-IV-III. Leg measurements: I, femur 2.4, patella 0.84, tibia 2.0, metatarsus 2.0, tarsus 0.64, total 7.88; II, 2.2, 0.8, 2.08, 2.0, 0.64, 7.72; III, 1.56, 0.64, 1.08, 1.12, 0.48, 4.88; IV, 1.88, 0.84, 1.48, 1.24, 0.48, 5.92. Macrosetae: I, femur D0-0-0-0-0-1-0, P0-0-0-0-2-1-0; tibia P1-0-1-0-1-0-1-0, vp1-0-0-0-0-0-0-1, vr1-1-0-1-1-1-0-1, R1-0-1-0-1-0-1-0 ( Fig. 41C ‒EView FIGURE 41); II, D0-0-0-0-0-1-0, P0-0-0-0-0-1-0; tibia P1-0-1-0-1-1/0-1-0, vp0-0-0-0-0-1/0-1, vr1-0-1-0-1-0-1, R0-0-1-0-0-0-0-0; IV, femur D0-1-1-0/1-0-0; metatarsus, vp0-0-1/0-0-2, metatarsal comb with 3 macrosetae.

Female (Paratype). Carapace and chelicerae reddish orange, with cephalic region darker ( Fig. 41FView FIGURE 41). Endites orange; labium dark orange. Sternum orange, with darker margins, and marbled with darker pigment ( Fig. 41GView FIGURE 41). Palps orange, gradually darkening to distal direction. Legs orange, with pairs I ‒II darker ( Fig. 41H ‒IView FIGURE 41). Abdomen as in male ( Fig. 41F ‒GView FIGURE 41). Total length 9.4; carapace 4.3 long, 2.65 wide. Carapace with wavy margins. Chelicerae not projected ( Fig. 41FView FIGURE 41). Sternum as in male ( Fig. 41GView FIGURE 41). 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. 41H ‒IView FIGURE 41). Leg formula: I-II-IV-III. Leg measurements: I, femur 3.25, patella 1.3, tibia 2.4, metatarsus 2.2, tarsus 0.65, total 9.8; II, 2.95, 1.45, 2.45, 2.15, 0.65, 9.65; III, 2.35, 1.2, 1.6, 1.55, 0.65, 7.35; IV, 2.6, 1.6, 2.4, 1.7, 0.7, 9.0. 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; metatarsus vp1-1-1-1-1-1-1- 1-1, vr1-1-1-1-1-1-1-1-1 ( Fig. 41H ‒IView FIGURE 41); II, femur P0-0-0-0-1-1-0; tibia vp0-0-0-0-1-1-1/0-1, vr1-1/0-1-0/1-1-0-1; metatarsus vp1-1-1-1-1-1-1-1-1-1, vr1-1-1-0/1-1-1-1-1-1; IV, metatarsus vp0-0-0-0-0-1, vr metatarsal comb with 3 macrosetae. Internal genitalia: anterior receptaculum with glandular plate slightly expanded in its proximal region ( Fig. 42C ‒DView FIGURE 42).

Variation. Female (n=6): Total length 8.65‒12.5; carapace 4.25‒5.95 long, 2.65‒3.75 wide; femur I 3.05‒4.3.

Distribution. Revillagigedo Islands, Mexico ( Fig. 67View FIGURE67).














Ariadna weaveri Beatty, 1970

Giroti, André Marsola & Brescovit, Antonio Domingos 2018

Ariadna weaveri

Beatty 1970: 464