Ariadna caparao 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 caparao

description: Ariadna caparao new species
Figures 64‒65, 72
Type-material. ♂ holotype and ♀ paratype from Trilha do Terreirão, Parque Nacional da Serra do Caparaó (20°25'S; 41°52'W), Alto Caparaó, Minas Gerais, Brazil, III.2003, E.W. Wienskoski leg., deposited in IBSP 38345. Paratypes: 1♂ 1♀, same holotype's data (IBSP 166970); 1♂ 1♀ from Parque Nacional da Serra do Caparaó, Espírito Santo / Minas Gerais, Brazil [20°25'S; 41°52'W], 13.X.1986, R.L.C. Baptista leg. (MNRJ 06420).
Additional material examined. BRAZIL: Minas Gerais State: Alto Caparaó, Parque Nacional da Serra do Caparaó [20°25'S; 41°52'W], 1♀, III.2003, E. Wienskoski leg. (IBSP 166971); 1♂, 13.X.1986, R.L.C. Baptista leg. (MNRJ 6411); Espírito Santo State: Ibitirama, Distrito de Santa Maria, Parque Nacional da Serra do Caparaó (20°25'44''S; 41°48'6.7''W), 1♂ 6♀ 1imm., 29.XI.2014, L.S. Carvalho & H.C. Costa leg. (CHNUFPI 1267).
Diagnosis. Ariadna caparao n. sp. is similar to A. lemosi n. sp. due to the morphology of the male palp (Figs 65A‒B, 66F‒G), but differs by the sinuous metatarsi I (Fig. 64D‒F), chelicerae with lamelliform distal dorsoprolateral projections (Fig. 64C), and abdomen mostly dark dorsally (Fig. 64A); females resembles A. obscura due to the tibiae I‒II macrosetae pattern, but differs by the anterior receptaculum without an expanded base and with the dorsal lobe long and almost straight (Fig. 65C‒D).
Etymology. The specific name is a noun in apposition taken from the type locality, Parque Nacional da Serra do Caparaó, Alto Caparaó, Minas Gerais, Brazil.
Description. Male (Holotype). Carapace and chelicerae dark brownish orange (Fig. 64A). Endites orange; labium dark orange. Sternum orange, with darker margins, and marbled with dark pigment (Fig. 64B). Palps orange (Fig. 65A‒B). Legs yellowish brown, with pairs I‒II darker and with dark pigment forming diffuse rings in the distal region of femur, patella, tibia, metatarsus and tarsus (Fig. 64D‒F). Abdomen uniformly grey (Fig. 64A‒B). Total length 5.6; carapace 3.04 long, 2.2 wide. Chelicerae with lameliform distal dorso-prolateral projections (Fig. 64C). Palps: tibia slightly incrassated, with the dorso-ventral diameter shorter than the bulb; bulb sub-rectangular, mid-portion shorter than the embolus; embolus tubular and tapered (Fig. 65A‒B). Legs: robust and coated with setae (Fig. 64D‒F); tarsal brush of putative chemosensory setae present in legs I‒IV, but reduced in pair I. Leg formula: I-II-IV-III. Leg measurements: I, femur 2.96, patella 1.0, tibia 2.12, metatarsus 2.36, tarsus 0.76, total 9.2; II, 2.68, 1.0, 2.12, 2.08, 0.8, 8.68; III, 1.96, 0.76, 1.24, 1.32, 0.68, 5.96; IV, 2.28, 1.0, 1.6, 1.44, 0.68, 7.0. Macrosetae: I, femur D0-0-0-0-0-2-0, P0-0-0-0-1-1-0; tibia P0-1-0-1-0-1-0, vp1-0-0-0-0-0-1, vr1-1-1-1-1-1-1, R0- 1-0-1-0-1-0; metatarsus vp1-0-0-0-0-0-0; II, femur D0-0-0-1-0-2-0, P0-0-0-0-1-1-0; tibia P0-1-0-1-0-1-0, vp0-0-0- 0-0-0-1, vr2/1-1-1-1-1/0-1-1/0-1, R1-0-1-0-1-0-1; metatarsus vp1-0-0-0-0-0-0, vr1-0-0-1-0-0-1; IV, femur D1-1-1- 1-0-1-0, R0-0-0-0-0-1-0; metatarsus vp0-0-0-0-0-0-2/1, vr metatarsal comb with 5 macrosetae.
Female (Paratype—IBSP 38345). Coloration as in male; palps reddish orange, gradually darkening to distal direction (Fig. 64 G-J). Total length 8.44; carapace 4.12 long, 2.8 wide. Chelicerae without lamelliform distal dorso-prolateral projections Carapace with cephalic region elevated (Fig. 64G). Legs: robust and densely coated with setae, with the setae dorsally concentrated in the articles; legs I‒II with ventro-prolateral and ventroretrolateral tibial macrosetae of similar size, and metatarsal macrosetae of different sizes (Fig. 64I ‒J). Leg formula: I-II-IV-III. Leg measurements: I, femur 2.92, patella 1.24, tibia 2.08, metatarsus 1.96, tarsus 0.68, total 8.88; II, 2.68, 1.24, 2.16, 1.88, 0.68, 8.64; III, 2.08, 1.08, 1.4, 1.28, 0.6, 6.44; IV, 2.4, 1.36, 1.8, 1.44, 0.64, 7.64. Macrosetae: I, femur D0-0-0-0-0-2-0, P0-0-0-0-2-0-0; tibia vp1-1/0-1-1-1-1/0-1, vr1-1-1-1-1-1/0-1, R0-1-0-1-0-1-0; metatarsus vp1-1-0/1-1-1-1-1-1-1, vr1-1-1-1-0/1-1-0/1-1-1 (Fig. 64I ‒J); II, P0-0-0-0-1-1-0; tibia vp1-0-1-1-1-1-0, vr1-1-1-1- 1-0/1-1-0, R0-0-0-1-1-1-0; metatarsus vp1-1-1-1-1-1/0-1-1-1, vr1-1-1-0-1-1-1-1-1; IV, metatarsus vr metatarsal comb with 6 macrosetae. Internal genitalia: anterior receptaculum billobulated, with elongated lobes, being the ventral one longer than the dorsal. Ventral lobe sinuous, with the tip expanded and glandular ducts plate located in the median region, extending to the proximal region of the dorsal lobe (Fig. 65C‒D).
Variation. Male (n=5): Total length 5.6‒7.52; carapace 3.04‒4.0 long, 2.2‒2.72 wide; femur I 2.96‒3.6. Female (n=10): Total length 7.84‒10.2; carapace 3.88‒4.52 long, 2.68‒3.12 wide; femur I 2.64‒3.04.
Distribution. Brazil (east of Minas Gerais and west of Espírito Santo) (Fig. 72).
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 101-104, DOI: 10.11646/zootaxa.4400.1.1, http://zenodo.org/record/1207641