Ariadna aurea Giroti & Brescovit 2018, new species
Creators: name: Giroti, André Marsola
name: Brescovit, Antonio Domingos
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Segestriidae
Ariadna
Ariadna aurea

description: Ariadna aurea new species
Figures 56‒57, 71
Type material: ♂ holotype from Gruta dos Brejões [11°33'00"S; 41°09'21"W], Morro do Chapéu, Bahia, Brazil, 14.V.2009, M.E. Bichuette leg., deposited in IBSP 151451. Paratypes: 2♀, same data from holotype (IBSP 151451).
Diagnosis. Ariadna aurea n. sp. is similar to A. obscura, A. tarsalis, A. arthuri, A. multispinosa and A. reginae n. sp. due to the morphology of the male metatarsi I (Figs 16C‒E, 32C‒E, 38C‒E, 54C‒E, 56C‒E) and macrosetae pattern of the tibia I‒II of females, but differ by the presence of males with a slender metatarsi I with a short ventroretrolateral apophysis bearing one macroseta, together with a truncated macroseta in the distal region (Fig. 56C‒E); females differ by the presence of lobes with an irregular cuticle, and dorsal lobe wider than the ventral one (Fig. 57C‒D).
Etymology. The specific name is refers to the adjective in Latin “ aurum ”, meaning “golden”, referring to the nearly golden coloration of the carapace of type specimens.
Description. Male (Holotype). Carapace and chelicerae light orange (Fig. 56A). Endites orange; labium dark orange. Sternum yellow, with darker margins (Fig. 56B). Palps light yellow (Fig. 57A‒B). Legs yellow, with pairs I‒II darker (Fig. 56C‒E). Abdomen pale grey (Fig. 56A‒B). Total length 6.4; carapace 3.4 long, 2.36 wide. Chelicerae projected, with frontal region flattened (Fig. 56A). Palps: tibia slightly incrassated, almost cylindrical, with the dorso-ventral diameter shorter than the bulb; bulb sub-rectangular, mid-portion shorter than the embolus; embolus tubular, with tapered tip, abruptly curved (Fig. 57A‒B). Legs: slender and coated with short setae (Fig. 56C‒E); tibia I with the distal ventro-retrolateral macrosetae lanceolated, retilinuous, shorter than the others (Fig. 56D); metatarsus I with a group of short distinct setae in the retrolateral median apophysis (Fig. 56D); tarsal brush of putative chemosensory setae reduced and present only in leg IV. Leg formula: I-II-IV-III. Leg measurements: I, femur 4.2, patella 1.24, tibia 4.28, metatarsus 3.68, tarsus 0.88, total 14.28; II, 3.96, 1.28, 3.92, 3.88, 0.76, 13.8; III, 3.2, 1.2, 2.72, 3.12, 0.72, 10.96; IV, 3.72, 1.32, 3.12, 3.2, 0.76, 12.12. Macrosetae: I, femur D0-0-1-0-1-0-2-0, P0- 0-0-1-2-0-1-0; tibia P1-0-1-0-1-0-1-0, vp2-1-0-1-0-1-0-1-0, vr2-1-0-1-0-1-0-1-1(lanceolated), R1-0-1-0-1-1-0-1-0; metatarsus P0-0-1-0-0-1(truncated)-0-0, vp1-0-0-1-0-0-0-0, vr0-0-0-1(apophysis)-0-0-0-1 (Fig. 56C‒E); II, D0-0- 1-1-1-1-1-1-0-1-0-2-0, P0-0-0-0-0-0-0-1-0-0-1-0; tibia P1-0-1-0-1-0-1-0, vp2-0-1-0-1-0-1-0, vr2-0-1-0-1-0-1-0-1- 0, R1-0-1-0-1-0-1-0; metatarsus P0-0-1-0-0-0-0-0-0, vp1-0-0-1-0-0-1-0-0, vr1-0-0-0-1-0-0-0-1, R0-0-1-0-1-0-1-0- 0; IV, D1-1-1-0-1-1-0-1-1-0-1-1-0-1-0, R0-0-0-0-0-0-0-0-0-0-0-0-0-1-0; tibia R1-0-0-0-0-0; metatarsus, vr metatarsal comb with 3 macrosetae.
Female (Paratype). Carapace and chelicerae orange, with cephalic region and chelicerae darker (Fig. 56F). Endites orange; labium dark orange. Sternum as in male (Fig. 56G). Palps orange, gradually darkening to distal direction (Fig. 56H‒I). Legs and abdomen as in male (Fig. 56F‒I). Total length 9.36; carapace 4.6 long, 2.84 wide. Carapace with cephalic region elevated, and wavy margins. Chelicerae projected (Fig. 56F). Legs: slender and coated with short setae; legs I‒II with conspicuously long ventro-prolateral and ventro-retrolateral tibial macrosetae (about one and a half the tibia's length) of similar size, and metatarsal macrosetae of different sizes (Fig. 56H‒I). Leg formula: I-II-IV-III. Leg measurements: I, femur 4.0, patella 1.44, tibia 4.08, metatarsus 3.2, tarsus 0.68, total 13.4; II, 3.72, 1.52, 3.76, 3.12, 0.64, 12.76; III, 3.08, 1.36, 2.72, 2.64, 0.64, 10.44; IV, 3.72, 1.52, 3.52, 3.04, 0.68, 12.48. Macrosetae: I, femur D0-0-1-0-1-0-2-0, P0-0-0-0-1-2-1-1-0; tibia P1-1-0/1-1-0-0-0-0, vp1- 1-1-1-1-1-1-1-0-1-0, vr2-1-1-1-1-1-1-1-1-1-0, R1-1-0-1-0-1-0-0-0; metatarsus vp1-1-1-1-1-1-1-1-1-1-1-1, vr1-1- 1-1-1-1-1-1-1-1-1-1 (Fig. 56H‒I); II, femur D0-0-1-1-1-0-2-0, P0-0-0-0-1-0-1/0-0; tibia P1-1-1-1-0-0-0-0, vp1-1- 1-1-1-1-1-1-1-0, vr2-0/1-1-1-1-1-1-1-1-1-1-0, R0-0-1-0/1-0-0-0-0; metatarsus vp1-1-1-1-1-1-1-1-1-1-1-1, vr1-1-1/ 0-1-1-1-1-1-1-1-1/0-1; IV, metatarsus, vr metatarsal comb with 3 macrosetae. Internal genitalia: anterior receptaculum with similar sized lobes and glandular plate expanded (Fig. 57C‒D).
Variation. Female (n=2): Total length 8.4‒9.36; carapace 3.68‒4.6 long, 2.48‒2.84 wide; femur I 3.44‒4.0. Distribution. Only known from the type locality (Fig. 71).
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 90-93, DOI: 10.11646/zootaxa.4400.1.1, http://zenodo.org/record/1207641