Ariadna weaveri Beatty 1970
Creators: name: Giroti, André Marsola
name: Brescovit, Antonio Domingos
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Segestriidae
Ariadna
Ariadna weaveri

description: 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).
description: Published as part of Giroti, André Marsola & Brescovit, Antonio Domingos, 2018, The taxonomy of the American Ariadna Audouin (Araneae: Synspermiata: Segestriidae), pp. 1-114 in Zootaxa 4400 (1) on pages 70-71, DOI: 10.11646/zootaxa.4400.1.1, http://zenodo.org/record/1207641