Ariadna gaucha,

Giroti, André Marsola & Brescovit, Antonio Domingos, 2018, The taxonomy of the American Ariadna Audouin (Araneae: Synspermiata: Segestriidae), Zootaxa 4400 (1), pp. 1-114: 95-97

publication ID 10.11646/zootaxa.4400.1.1

publication LSID

persistent identifier

treatment provided by


scientific name

Ariadna gaucha

new species

Ariadna gaucha  new species

Figures 60‒61View FIGURE 60View FIGURE 61, 70View FIGURE 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 24622View Materials.)GoogleMaps  ; 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 1043View Materials)GoogleMaps  ; 1♂ from Porto Alegre , Rio Grande do Sul, Brazil, 25.X.1994, M.A.L. Marques leg. ( MCN 25873View Materials)  ; 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 16822View Materials)GoogleMaps  ; 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 22335View Materials).GoogleMaps 

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 1041View Materials); Capão da Canoa [29°45'39"S; 50°01'48"W], 14♀ 6imm., 6.I.1963, C.A. Hartlieb leg. ( MCN 1052View Materials); Porto Alegre [30°01"58"S; 51°13'48"W], 1♂, 17.XI.1991, M.A.L. Marques leg. ( MCN 21612View Materials); 1♂, 25.XI.2000 ( MCN 33489View Materials); 1♂, 2.I.2003 ( MCN 35030View Materials); 1♂, 2009 ( MCN 46763View Materials); 1♂, 5.X.1998, Z. Rosa leg. ( MCN 29474View Materials); 1♂, 19.V.1973, S.L. Cardoso leg. ( MCN 52084View Materials); Reserva Biológica do Lami José Lutzenberger (30°14'S; 51°06'W), 1♂, 20.X ‒8.XI.2005, R. Moraes leg. ( MCN 40282View Materials); Morro São José [30°01'58"S; 51°13'48"W], 1♂, 6.I.1963, C.A. Hartlieb leg. ( MCN 1176View Materials); Viamão, Parque Estadual de Itapuã [30°04'51"S; 51°01'22"W], 1♀ 2imm., 2.XI.1962, C.A. Hartlieb leg. ( MCN 1062View Materials); 1♂, 21.X.2003, A.C.K. Ferreira leg. ( MCTP 16819View Materials); 1♂, 10.II.2004 ( MCTP 16820View Materials); 1♂, 8.X.2003 ( MCTP 16821View Materials); 1♂, 30.XII.2003 ( MCTP 16823View Materials); 1♂, 12.VIII.2003 ( MCTP 16View Materials 824); 1♀, 28.VIII.2003 ( MCTP 16825View Materials); 1♂, 17.XII.2003 ( MCTP 16826View Materials); 1♂, 26.I.2004 ( MCTP 16827View Materials); Foz Arroio Itapuã, 1♂, 11.IX.2001, L.E.C. Schmidt & R. Ott leg. ( MCN 34282View Materials); Cidreira [30°10'26"S; 50°12'27"W], 1♂, 6.IX.2003, J.A.M. Pinto leg. ( MCTP 22336View Materials); 1♂, 1.XI.2003 ( MCTP 22337View Materials); 3♂, 29.XI.2003 ( MCTP 22338‒22340View Materials); 3♂, 26.XII.2003 ( MCTP 22341View Materials; 22342); Tapes [30°40'22"S; 51°23'45"W], 1♀ 1imm., 18.II.1977, E.H. Buckup leg. ( MCN 5292View Materials).GoogleMaps 

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 ‒BView FIGURE 37, 44A ‒BView FIGURE44, 58G ‒HView FIGURE 58, 61A ‒BView FIGURE 61) and metatarsi IV ( Figs 36FView FIGURE 36, 43FView FIGURE 43, 58FView FIGURE 58, 60FView FIGURE 60), 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 ‒BView FIGURE 61); females differ from those by the presence of a strongly sinuous ventral lobe, with an expanded tip ( Fig. 61C ‒DView FIGURE 61).

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. 60AView FIGURE 60). Endites orange, labium dark orange. Sternum orange, with darker margins ( Fig. 60BView FIGURE 60). Palps orange ( Fig. 61A ‒BView FIGURE 61). 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 ‒FView FIGURE 60). Abdomen grey, lighter ventrally ( Fig. 60A ‒BView FIGURE 60). 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 ‒BView FIGURE 61). Legs: robust and coated with setae ( Fig. 60C ‒FView FIGURE 60); metatarsi IV slightly sinuous, in lateral view ( Fig. 60FView FIGURE 60); tarsal brush of putative chemosensory setae present in tarsi II ‒IV, extending to the median region of metatarsi IV ( Fig. 60FView FIGURE 60). 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 ‒HView FIGURE 60). 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 ‒JView FIGURE 60). 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 ‒JView FIGURE 60). 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 ‒JView FIGURE 60); 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 ‒DView FIGURE 61).

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. 70View FIGURE 70).


McNeese State University