Ariadna isthmica Beatty 1970
Creators: name: Giroti, André Marsola
name: Brescovit, Antonio Domingos
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Segestriidae
Ariadna
Ariadna isthmica

description: Ariadna isthmica Beatty, 1970
Figures 43‒44, 68
Ariadna isthmica Beatty, 1970: 470, figs 23‒25, 30 (♂ holotype from Barro Colorado Island [09°09'N; 79°51'W], Canal Zone, Panama, 1‒2.VII.1939, A.M. Chickering leg., deposited in MCZ 21712, examined. Paratypes: ♀, same holotype's locality and collector, 28‒31.VII.1939 (MCZ 27669); 1♀ 4imm., 16.VI‒15.VII.1934 (MCZ 27675); 2imm., 7‒9.VII.1936 (MCZ 27681); 2♀, 23‒30.VI.1939 (MCZ 27682); 1♂ 1imm., 8‒9.VIII.1939 (MCZ 27683); 1♀, 1936 (MCZ 27684); 1♂, 19.IV.1939, V.H. Dropkin leg. (AMNH); 5imm. from Canal Zone Biological Area, Canal Zone, Panama, VI.1950, A.M. Chickering leg. (MCZ 27667); 1♀ from Canal Zone Forest PreserVe, Canal Zone, Panama, 25.VII.1954, A.M. Chickering leg. (MCZ 27673); 2imm. from Huaspuc River [14°37'60"N; 84°25'60"W], Musawas, Nicaragua, 10‒31.X.1955, B. Malkin leg. (AMNH), all examined).— World Spider Catalog (2018).
Additional material examined. COSTA RICA: Limón Province: Estación Reserva Biológica Hitoy Cerere [9°38'32.3"N; 83°04'14.6"W], La poza de las chichis, 140m, 1♂, 21‒24.VI.1998, E. Rojas leg. (INBIO 4407610); Cuatro Esquinas [10°27'27.0"N; 83°40'06.2"W], 200m, 1♂, IV‒IX.1990, J. Solano leg. (INBIO 4407604); Guanacaste Province: Bagaces, Parque Nacional Palo Verde [10°22'59.9"N; 85°20'02.5"W], Estación Palo Verde, 0‒100m, 1♂ 1♀, 15.VI.1999, C. Víquez leg. (INBIO 4407887); Fita Catalina, 250m, 1♀, 9.III‒6.IV.2000, I. Jiménez leg. (INBIO 4407618); 150 N de la Estación, 50m, 1imm., 6‒20.V.1999, I. Jiménez leg. (INBIO 4407889); Área de Conservación Guanacaste, Liberia, Parque Nacional Santa Rosa [10°53'01''N; 85°46'30''W], Estación Santa Rosa, 300m, 2♀, 1‒31.I.1991, D. Janzen leg. (INBIO 4407615); Área de Conservación Guanacaste, La Cruz, Parque Nacional Guanacaste [10°57'21.9"N; 85°29'42.9"W], Estación Maritza, 600m, 2♂, 1‒31.V.1996, M. Pereira leg. (INBIO 4407616); 1imm., 1‒30.IX.1996 (INBIO 4407609); 2imm., 1‒31.I.1997, C. Zuniga leg. (INBIO 4407617); 600‒700m, 1♀, 22.IV.2004, G. Alayón leg. (INBIO 4407614); Sendero a la Toma de Água, 1♀, 22.IV.2004, R. Gutiérrez leg. (INBIO 4407613); NICARAGUA: Granada Department: Volcan Mombacho [11°49'3''N; 85°58'03"W], San Joaquin #1, 1♂, 15.VI.1999, J.M. Maes leg. (MCZ 32451); Volcan Mombacho, El Progreso #1, non-organic coffee plantation, elev. 700‒800m, 1♀, 2.VI.1998, J.M. Maes leg. (MCZ 32454); 1♂, 21.VI.1998 (MCZ 32455); PANAMA: Canal Zone: Barro Colorado Island [09°09'N; 79°51'W], Kodak House, 1♀, 10.IV.1976, Silberglied & Aiello leg. (USNM); Panama [08°59'N; 79°31'W], 2♀, 24‒25.XII.1943, D. L.F. leg. (CAS 9039563); BRAZIL: Amazonas State: Reserva Florestal Adolpho Ducke, 100m (02°55'12"S; 59°58'48"W), 1♂, 16.IX.1991, H. Höfer & T. Gasnier leg. (SMNK-ARA 3035); Pará State: Ilha de Marajó, Salvaterra, Praia de Joanes [00°45'10"S; 48°31'01"W], 1♀, 15.II.2010, R.P. Indicatti, D.F. Candiani & N.F. Lo-Man-Hung leg. (MPEG 15621); Senador José Porfírio [02°35'27"S; 51°57'14"W], 1♂, 2.III.2001 (MPEG 11278).
Diagnosis. Ariadna isthmica is similar to A. boliviana, A. ipojuca n. sp. and A. gaucha n. sp. due to the morphology of male palp (Figs 37A‒B, 44A‒B, 58G‒H, 61A‒B), metatarsi IV (Figs 36F, 43F, 58F, 60F), and leg macrosetae of females, but differ by the presence of sinuous metatarsi I, with both extremes equal in size and similarly bended; basal region prolaterally bended, and distal region retrolaterally (Fig. 43C‒E); females differ from these species by the presence of a ventral lobe less sinuous (Fig. 44C‒D).
Description. Male (Paratype—Barro Colorado Island—AMNH). Carapace and chelicerae brownish orange (Fig. 43A). Endites orange; labium dark orange. Sternum orange, with darker margins, and three pairs of fainted dark marginal areas (Fig. 43B). Palps orange (Fig. 44A‒B). Legs brownish orange, pairs I‒II darker, with the femur, patella and tibia marbled with fainted dark pigment, and dark diffuse rings in the distal region of metatarsus (Fig. 43C‒F). Abdomen grey, lighter ventrally (Fig. 43A‒B). Total length 6.24; carapace 3.12 long, 2.32 wide. Palps: tibia incrassated, with the dorso-ventral diameter shorter than the bulb; bulb rounded, midportion shorter than the embolus and directed backwards; mid-portion/embolus transition conspicuous; embolus long and with a tubular tip (Fig. 44A‒B). Legs: slender and sparsely coated with setae (Fig. 43C‒F); metatarsi IV sinuous, in lateral view (Fig. 43F); tarsal brush of putative chemosensory setae present in legs II‒IV, extending to the median region of the metatarsi IV (Fig. 43F). Leg formula: I-II-IV-III. Leg measurements: I, femur 3.0, patella 1.2, tibia 2.52, metatarsus 2.72, tarsus 0.72, total 10.16; II, 2.68, 1.12, 2.52, 2.72, 0.76, 9.8; III, 2.08, 0.96, 1.56, 1.68, 0.64, 6.92; IV, 2.4, 1.08, 1.88, 1.68, 0.64, 7.68. Macrosetae: I, femur D0-0-0-1-0-2-0, P0-0-0-0-1-1-0; tibia D0-0-0-0-1-0-0, P0-1-0-1-0-1-0, vp1-0-0-0-0-0-1, vr2-0-1-0-1-0-1, R1-1-1-1-1-1-1; metatarsus p0-1-0-0-0-0-0, vp0-1-0-0-1-0-1, vr0-0-0-0-1-0-1 (Fig. 43C‒E); II, femur D0-0-0/1-0/1-0-2-0, P0-0-0-0-1-1-0; tibia D0-0-0-0-0/1- 0-0, P0-1-0-1-0-1-0, vp0-0-0-0-0-1-1, vr2-0-1-0-1-0/1-1, R1-1-0-1-0-1-0; metatarsus p0-1-0-0-0-0-0, vp1-0-0-1-0- 0-1, vr1-0-0-1-0-0-1, r0-0-0/1-0-1/0-0-0; IV, femur D1/0-1-0-0-0-0-0; metatarsus vr metatarsal comb with 4 macrosetae.
Female (Barro Colorado Island—USNM). Coloration as in male; palps orange, gradually darkening to distal direction (Fig. 43G‒H). Total length 10.56; carapace 3.8 long, 2.56 wide. Legs: robust and densely coated with setae; legs I‒II with ventro-prolateral and ventro-retrolateral tibial macrosetae of similar size, and metatarsal macrosetae of different sizes (Fig. 43I ‒J). Leg formula: I-II-IV-III. Leg measurements: I, femur 2.8, patella 1.32, tibia 2.2, metatarsus 2.0, tarsus 0.68, total 9.0; II, 2.6, 1.32, 2.2, 2.0, 0.68, 8.8; III, 2.04, 1.12, 1.44, 1.44, 0.64, 6.68; IV, 2.44, 1.32, 1.92, 1.6, 0.6, 7.88. Macrosetae: I, femur D0-0-0-0-0-2-0, P0-0-0-2-1-0-0; tibia P0-0-0-1-0-1-0, vp1- 0-1-0-1-0-1, vr1-0-1-0-1-0-1, R0-1-0-1-0-1-0; metatarsus vp1-1-1-1-1-1-1, vr1-1-1-1-1-1-1 (Fig. 43I ‒J); II, femur D0-0-0-0-0-2-0, P0-0-0-0-0-1-0; tibia P0-1-0-1-0-1-0, vp0-0-0-1(slender)-0-1-1, vr1-0-1-0-1-0-1, R0-1-0-1-0-1-0; metatarsus vp1-1-1-1-1-1-1, vr1-1-1-1-1-0/1-1-1-1; IV, metatarsus vp0-0-0-0-0-1, vr metatarsal comb with 4 macrosetae. Internal genitalia: anterior receptaculum with short lobes, and glandular plate in the proximal region, expanded laterally (Fig. 44C‒D).
Variation. Male (n=10): Total length 4.52‒7.76; carapace 2.28‒3.68 long, 1.6‒2.72 wide; femur I 2.32‒3.4. Female (n=10): Total length 7.2‒12.48; carapace 3.2‒4.32 long, 2.08‒2.8; femur I 2.32‒2.96.
Distribution. Nicaragua, Panama and north of Brazil (Fig. 68).
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 71-74, DOI: 10.11646/zootaxa.4400.1.1, http://zenodo.org/record/1207641