Ariadna gaucha 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 gaucha

description: Ariadna gaucha new species
Figures 60‒61, 70
Type-material. ♂ holotype from Porto Alegre [30°01'58"S; 51°13'48"W], Rio Grande do Sul, Brazil, 10.XII.1993, M.A.L. Marques leg., deposited in MCN 24622.); Paratypes: 1♂ 10♀ 8 imm. from Cantagalo, Viamão [30°04'51"S; 51°01'22"W], Rio Grande do Sul, Brazil, 12.VII.1963, J. Pacini leg. (MCN 1043); 1♂ from Porto Alegre, Rio Grande do Sul, Brazil, 25.X.1994, M.A.L. Marques leg. (MCN 25873); 1♂ from Parque Estadual de Itapuã, Viamão [30°04'51"S; 51°01'22"W], Rio Grande do Sul, Brazil, 13.I.2004, A.C.K. Ferreira et al. leg. (MCTP 16822); 1♂ from Cidreira, Rio Grande do Sul, Brazil [30°10'26"S; 50°12'27"W], 10.VIII.2003, J.A.M. Pinto leg. (MCTP 22335).
Additional material examined. BRASIL: Rio Grande do Sul State: Santo Ângelo [28°17'56"S; 54°15'46"W], 1♀ 6imm., 19.VII.1963, L.O. de Moraes leg. (MCN 1041); Capão da Canoa [29°45'39"S; 50°01'48"W], 14♀ 6imm., 6.I.1963, C.A. Hartlieb leg. (MCN 1052); Porto Alegre [30°01"58"S; 51°13'48"W], 1♂, 17.XI.1991, M.A.L. Marques leg. (MCN 21612); 1♂, 25.XI.2000 (MCN 33489); 1♂, 2.I.2003 (MCN 35030); 1♂, 2009 (MCN 46763); 1♂, 5.X.1998, Z. Rosa leg. (MCN 29474); 1♂, 19.V.1973, S.L. Cardoso leg. (MCN 52084); Reserva Biológica do Lami José Lutzenberger (30°14'S; 51°06'W), 1♂, 20.X‒8.XI.2005, R. Moraes leg. (MCN 40282); Morro São José [30°01'58"S; 51°13'48"W], 1♂, 6.I.1963, C.A. Hartlieb leg. (MCN 1176); Viamão, Parque Estadual de Itapuã [30°04'51"S; 51°01'22"W], 1♀ 2imm., 2.XI.1962, C.A. Hartlieb leg. (MCN 1062); 1♂, 21.X.2003, A.C.K. Ferreira leg. (MCTP 16819); 1♂, 10.II.2004 (MCTP 16820); 1♂, 8.X.2003 (MCTP 16821); 1♂, 30.XII.2003 (MCTP 16823); 1♂, 12.VIII.2003 (MCTP 16 824); 1♀, 28.VIII.2003 (MCTP 16825); 1♂, 17.XII.2003 (MCTP 16826); 1♂, 26.I.2004 (MCTP 16827); Foz Arroio Itapuã, 1♂, 11.IX.2001, L.E.C. Schmidt & R. Ott leg. (MCN 34282); Cidreira [30°10'26"S; 50°12'27"W], 1♂, 6.IX.2003, J.A.M. Pinto leg. (MCTP 22336); 1♂, 1.XI.2003 (MCTP 22337); 3♂, 29.XI.2003 (MCTP 22338‒22340); 3♂, 26.XII.2003 (MCTP 22341; 22342); Tapes [30°40'22"S; 51°23'45"W], 1♀ 1imm., 18.II.1977, E.H. Buckup leg. (MCN 5292).
Diagnosis. Ariadna gaucha n. sp. is similar to A. boliviana, A. isthmica and A. ipojuca n. sp. due to the morphology of male palp (Figs 37A‒B, 44A‒B, 58G‒H, 61A‒B) and metatarsi IV (Figs 36F, 43F, 58F, 60F), differing from them, except A. ipojuca n. sp., by the presence of a less marked transition between mid-portion and embolus; it differs from A. ipojuca n. sp. by the abruptly curved embolus (Fig. 61A‒B); females differ from those by the presence of a strongly sinuous ventral lobe, with an expanded tip (Fig. 61C‒D).
Etymology. The specific name is an adjective in apposition, referring to the “gaucho”, people that live in the State of Rio Grande do Sul, Brazil.
Description. Male (Holotype). Carapace and chelicerae orange (Fig. 60A). Endites orange, labium dark orange. Sternum orange, with darker margins (Fig. 60B). Palps orange (Fig. 61A‒B). Legs orange, with pairs I‒II darker and with dark pigment forming diffuse rings in the distal region of the patella, tibia, metatarsi and tarsi (Fig. 60C‒F). Abdomen grey, lighter ventrally (Fig. 60A‒B). Total length 5.76; carapace 2.6 long, 1.76 wide. Palps: tibia slightly incrassated, with the dorso-ventral diameter almost the same as the bulb; bulb rounded, mid-portion shorter than the embolus and abruptly curved forwards; embolus with a tubular and tapered tip, directed upward; (Fig. 61A‒B). Legs: robust and coated with setae (Fig. 60C‒F); metatarsi IV slightly sinuous, in lateral view (Fig. 60F); tarsal brush of putative chemosensory setae present in tarsi II‒IV, extending to the median region of metatarsi IV (Fig. 60F). Leg formula: I-II-IV-III. Leg measurements: I, femur 2.44, patella 0.92, tibia 2.04, metatarsus 2.28, tarsus 0.56, total 8.24; II, 2.36, 0.92, 2.04, 2.24, 0.6, 8.16; III, 1.72, 0.8, 1.24, 1.36, 0.52, 5.64; IV, 2.0, 0.88, 1.48, 1.36, 0.52, 6.24. Macrosetae: I, femur D0-1-0-1-0-1-1/0-0-2-0, P0-0-0-0-0-0-0-1-1-0; tibia D0-0-0-1-0-1-0, P1-1- 0-1-0-1-0, vp1-0-0-0-0-0-1, vr2-0-1-0-1-0-1, R1-1-0-1-0-1-0-1; metatarsus p0-1-0-0-0-0-0, vp0-0-1-0-1-0-0, vr0- 0-0-0-0-0-1; II, femur D0-1-0-1-0-1-0-2-0, P0-0-0-0-0-1-0-1-0; tibia D0-0-0-0-0-1-0, P1-1-0-1-0-1-0, vp0-0-0-0-1- 0-1, vr2-0-1-0-1-0-1, R1-1-0-1-0-1-0-1; metatarsus p0-1-0-0-0-0-0, vp1-0-0-1-0-0-1, vr1-0-0-1-0-0-1, r0-1-0-0-0- 0-0; IV, femur D1-1-1-1-0-1-0, R0-0-0-0-0-1-0; metatarsus vp0-0-0-0-0-0-1, vr metatarsal comb with 4 macrosetae.
Female (Paratype—MCN 1043). Coloration of carapace, chelicerae, endites, labium, sternum and abdomen as in male (Fig. 60G‒H). Palps orange, darkening gradually in distal direction. Legs orange, with pairs I‒II darker and with dark pigment forming diffuse rings in the distal region of the femur, patella, tibia, metatarsus and tarsus (Fig. 60I ‒J). Total length 8.0; carapace 3.2 long, 1.96 wide. Legs: robust and densely coated with setae; legs I‒II with ventral setae that gradually reduce its size in distal direction, ventro-prolateral and ventro-retrolateral tibial macrosetae of similar size, and metatarsal macrosetae of different sizes (Fig. 60I ‒J). Leg formula: I-II-IV-III. Leg measurements: I, femur 2.24, patella 1.12, tibia 1.76, metatarsus 1.72, tarsus 0.6, total 7.44; II, 2.0, 1.12, 1.8, 1.72, 0.6, 7.24; III, 1.64, 0.88, 1.12, 1.16, 0.56, 5.36; IV, 2.04, 1.12, 1.64, 1.24, 0.48, 6.52. Macrosetae: I, femur D0-0-0- 0-1-0-2-0, P0-0-0-0-2-0-1-0; tibia P0-1-0-1-0-0-1-0, vp1-1/0-1-0-1-0-1, vr1-0-1-0-1-0-1, R0-1-0-1-0-0-1-0; metatarsus vp0-1-1-1-1-1-1-1-1, vr0-1-1-1-1-1-1-1-1 (Fig. 60I ‒J); II, femur D0-1-0-1/0-0-1-0-2-0, P0-0-0-0-0-0-0/ 1-1-0; tibia P0-1-0-1-0-1-0, vp1(slender)-0-1-0-1-0-1, vr1-0/1-1-0-1-0-1, R0-1-0-1-0-0-0; metatarsus vp0-1-1-1-1- 1-1-1-1-1, vr0-1-1-1-1-1-1-0-1-1; IV, metatarsus vp0-0-0-0-0-0-1, vr metatarsal comb with 4 macrosetae. Internal genitalia: anterior receptaculum with a glandular ducts plate located in the median region, with the proximal region expanded (Fig. 61C‒D).
Variation. Male (n=10): Total length 4.6‒6.5; carapace 2.25‒3.05 long, 1.6‒2.1 wide; femur I 2.1‒2.65. Female (n=10): Total length 4.75‒7.75; carapace 2.35‒3.3 long, 1.55‒2.1 wide; femur I 1.75‒2.2. Distribution. Rio Grande do Sul (Brazil) (Fig. 70).
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 95-97, DOI: 10.11646/zootaxa.4400.1.1, http://zenodo.org/record/1207641