Ariadna aurea

Giroti, André Marsola & Brescovit, Antonio Domingos, 2018, The taxonomy of the American Ariadna Audouin (Araneae: Synspermiata: Segestriidae), Zootaxa 4400 (1), pp. 1-114: 90-93

publication ID 10.11646/zootaxa.4400.1.1

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Ariadna aurea

new species

Ariadna aurea  new species

Figures 56‒57View FIGURE 56View FIGURE 57, 71View FIGURE 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 151451View MaterialsGoogleMaps  . Paratypes: 2♀, same data from holotype ( IBSP 151451View Materials).GoogleMaps 

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 ‒EView FIGURE 16, 32C ‒EView FIGURE 32, 38C ‒EView FIGURE38, 54C ‒EView FIGURE54, 56C ‒EView FIGURE 56) 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 ‒EView FIGURE 56); females differ by the presence of lobes with an irregular cuticle, and dorsal lobe wider than the ventral one ( Fig. 57C ‒DView FIGURE 57).

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. 56AView FIGURE 56). Endites orange; labium dark orange. Sternum yellow, with darker margins ( Fig. 56BView FIGURE 56). Palps light yellow ( Fig. 57A ‒BView FIGURE 57). Legs yellow, with pairs I ‒II darker ( Fig. 56C ‒EView FIGURE 56). Abdomen pale grey ( Fig. 56A ‒BView FIGURE 56). Total length 6.4; carapace 3.4 long, 2.36 wide. Chelicerae projected, with frontal region flattened ( Fig. 56AView FIGURE 56). 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 ‒BView FIGURE 57). Legs: slender and coated with short setae ( Fig. 56C ‒EView FIGURE 56); tibia I with the distal ventro-retrolateral macrosetae lanceolated, retilinuous, shorter than the others ( Fig. 56DView FIGURE 56); metatarsus I with a group of short distinct setae in the retrolateral median apophysis ( Fig. 56DView FIGURE 56); 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 ‒EView FIGURE 56); 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. 56FView FIGURE 56). Endites orange; labium dark orange. Sternum as in male ( Fig. 56GView FIGURE 56). Palps orange, gradually darkening to distal direction ( Fig. 56H ‒IView FIGURE 56). Legs and abdomen as in male ( Fig. 56F ‒IView FIGURE 56). Total length 9.36; carapace 4.6 long, 2.84 wide. Carapace with cephalic region elevated, and wavy margins. Chelicerae projected ( Fig. 56FView FIGURE 56). 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 ‒IView FIGURE 56). 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 ‒IView FIGURE 56); 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 ‒DView FIGURE 57).

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. 71View FIGURE 71).