Ariadna gaucha, Giroti & Brescovit, 2018

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

http://doi.org/ 10.11646/zootaxa.4400.1.1

publication LSID

lsid:zoobank.org:pub:59CC08B8-5B13-42EC-943E-C930D7D0DD7F

persistent identifier

http://treatment.plazi.org/id/039B87D1-FFBA-B17A-169B-F8A5C45EFE09

treatment provided by

Plazi

scientific name

Ariadna gaucha
status

new species

Ariadna gaucha   new species

Figures 60‒61 View FIGURE 60 View FIGURE 61 , 70 View 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 24622 View 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 1043 View Materials ) GoogleMaps   ; 1♂ from Porto Alegre , Rio Grande do Sul, Brazil, 25.X.1994, M.A.L. Marques leg. ( MCN 25873 View 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 16822 View 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 22335 View 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 1041 View Materials ); Capão da Canoa [29°45'39"S; 50°01'48"W], 14♀ 6imm., 6.I.1963, C.A. Hartlieb leg. ( MCN 1052 View Materials ); Porto Alegre [30°01"58"S; 51°13'48"W], 1♂, 17.XI.1991, M.A.L. Marques leg. ( MCN 21612 View Materials ); 1♂, 25.XI.2000 ( MCN 33489 View Materials ); 1♂, 2.I.2003 ( MCN 35030 View Materials ); 1♂, 2009 ( MCN 46763 View Materials ); 1♂, 5.X.1998, Z. Rosa leg. ( MCN 29474 View Materials ); 1♂, 19.V.1973, S.L. Cardoso leg. ( MCN 52084 View Materials ); Reserva Biológica do Lami José Lutzenberger (30°14'S; 51°06'W), 1♂, 20.X ‒8.XI.2005, R. Moraes leg. ( MCN 40282 View Materials ); Morro São José [30°01'58"S; 51°13'48"W], 1♂, 6.I.1963, C.A. Hartlieb leg. ( MCN 1176 View Materials ); Viamão, Parque Estadual de Itapuã [30°04'51"S; 51°01'22"W], 1♀ 2imm., 2.XI.1962, C.A. Hartlieb leg. ( MCN 1062 View Materials ); 1♂, 21.X.2003, A.C.K. Ferreira leg. ( MCTP 16819 View Materials ); 1♂, 10.II.2004 ( MCTP 16820 View Materials ); 1♂, 8.X.2003 ( MCTP 16821 View Materials ); 1♂, 30.XII.2003 ( MCTP 16823 View Materials ); 1♂, 12.VIII.2003 ( MCTP 16 View Materials 824); 1♀, 28.VIII.2003 ( MCTP 16825 View Materials ); 1♂, 17.XII.2003 ( MCTP 16826 View Materials ); 1♂, 26.I.2004 ( MCTP 16827 View Materials ); Foz Arroio Itapuã, 1♂, 11.IX.2001, L.E.C. Schmidt & R. Ott leg. ( MCN 34282 View Materials ); Cidreira [30°10'26"S; 50°12'27"W], 1♂, 6.IX.2003, J.A.M. Pinto leg. ( MCTP 22336 View Materials ); 1♂, 1.XI.2003 ( MCTP 22337 View Materials ); 3♂, 29.XI.2003 ( MCTP 22338‒22340 View Materials ); 3♂, 26.XII.2003 ( MCTP 22341 View Materials ; 22342); Tapes [30°40'22"S; 51°23'45"W], 1♀ 1imm., 18.II.1977, E.H. Buckup leg. ( MCN 5292 View 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 ‒B View FIGURE 37 , 44A ‒B View FIGURE44 , 58G ‒H View FIGURE 58 , 61A ‒B View FIGURE 61 ) and metatarsi IV ( Figs 36F View FIGURE 36 , 43F View FIGURE 43 , 58F View FIGURE 58 , 60F View 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 ‒B View FIGURE 61 ); females differ from those by the presence of a strongly sinuous ventral lobe, with an expanded tip ( Fig. 61C ‒D View 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. 60A View FIGURE 60 ). Endites orange, labium dark orange. Sternum orange, with darker margins ( Fig. 60B View FIGURE 60 ). Palps orange ( Fig. 61A ‒B View 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 ‒F View FIGURE 60 ). Abdomen grey, lighter ventrally ( Fig. 60A ‒B View 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 ‒B View FIGURE 61 ). Legs: robust and coated with setae ( Fig. 60C ‒F View FIGURE 60 ); metatarsi IV slightly sinuous, in lateral view ( Fig. 60F View FIGURE 60 ); tarsal brush of putative chemosensory setae present in tarsi II ‒IV, extending to the median region of metatarsi IV ( Fig. 60F View 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 ‒H View 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 ‒J View 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 ‒J View 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 ‒J View 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 ‒D View 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. 70 View FIGURE 70 ).

MCN

McNeese State University

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Segestriidae

Genus

Ariadna