The taxonomy of the American Ariadna Audouin (Araneae: Synspermiata: Segestriidae) Author Giroti, André Marsola Author Brescovit, Antonio Domingos text Zootaxa 2018 2018-03-26 4400 1 1 114 journal article 30419 10.11646/zootaxa.4400.1.1 2b7bf048-65d5-4814-bbdb-59d53d15b00e 1175-5326 1207641 59CC08B8-5B13-42EC-943E-C930D7D0DD7F Ariadna weaveri Beatty, 1970 Figures 41‒42 , 67 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‒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 nearly straight, without macrosetae or apophyses ( Fig. 41C‒E ); females differ by presenting two lobes with similar sizes and sinuous, not expanded ( Fig. 42C‒D ). Description. Male ( Paratype ). Carapace and chelicerae orange ( Fig. 41A ). Endites yellow; labium dark yellow. Sternum light orange, with darker margins, and marbled with darker pigment ( Fig. 41B ). Palps light yellow ( Fig. 42A‒B ). Legs yellow, with pairs I‒II darker ( Fig. 41C‒E ). Abdomen grey, dorsal and ventrally, lighter laterally ( Fig. 41A‒B ). Total length 5.16; carapace 2.04 long, 1.52 wide. Chelicerae projected ( Fig. 41A ). 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‒B ). Legs: slender and sparsely coated with setae ( Fig. 41C‒E ); 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‒E ); 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. 41F ). Endites orange; labium dark orange. Sternum orange, with darker margins, and marbled with darker pigment ( Fig. 41G ). Palps orange, gradually darkening to distal direction. Legs orange, with pairs I‒II darker ( Fig. 41H‒I ). Abdomen as in male ( Fig. 41F‒G ). Total length 9.4; carapace 4.3 long, 2.65 wide. Carapace with wavy margins. Chelicerae not projected ( Fig. 41F ). Sternum as in male ( Fig. 41G ). 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‒I ). 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‒I ); 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‒D ). 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. 67 ).