Ariadna isthmica Beatty, 1970,

Giroti, André Marsola & Brescovit, Antonio Domingos, 2018, The taxonomy of the American Ariadna Audouin (Araneae: Synspermiata: Segestriidae), Zootaxa 4400 (1), pp. 1-114: 71-74

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Ariadna isthmica Beatty, 1970


Ariadna isthmica Beatty, 1970 

Figures 43‒44View FIGURE 43View FIGURE44, 68View FIGURE68

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 21712View Materials, examined. Paratypes: ♀, same holotype's locality and collector, 28‒31.VII.1939 ( MCZ 27669View Materials); 1♀ 4imm., 16.VI ‒15.VII.1934 ( MCZ 27675View Materials); 2imm., 7‒9.VII.1936 ( MCZ 27681View Materials); 2♀, 23‒30.VI.1939 ( MCZ 27682View Materials); 1♂ 1imm., 8‒9.VIII.1939 ( MCZ 27683View Materials); 1♀, 1936 ( MCZ 27684View MaterialsView Materials); 1♂, 19.IV.1939, V.H. Dropkin leg. ( AMNH); 5imm. from Canal Zone Biological Area, Canal ZoneGoogleMaps  , Panama, VI.1950, A.M. Chickering leg. ( MCZ 27667View Materials); 1♀ from Canal Zone Forest PreserVe, Canal Zone  , Panama, 25.VII.1954, A.M. Chickering leg. ( MCZ 27673View Materials); 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)GoogleMaps  ; Cuatro Esquinas [10°27'27.0"N; 83°40'06.2"W], 200m, 1♂, IV ‒IX.1990, J. Solano leg. ( INBIO 4407604)GoogleMaps  ; 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)GoogleMaps  ; 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)GoogleMaps  ; 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)GoogleMaps  ; 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 32451View Materials)GoogleMaps  ; Volcan Mombacho, El Progreso #1, non-organic coffee plantation, elev. 700‒800m, 1♀, 2.VI.1998, J.M. Maes leg. ( MCZ 32454View Materials)  ; 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)GoogleMaps  ; Panama [08°59'N; 79°31'W], 2♀, 24‒25.XII.1943, D. L.F. leg. ( CAS 9039563View Materials)GoogleMaps  ; 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)GoogleMaps  ; 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 15621View Materials)GoogleMaps  ; Senador José Porfírio [02°35'27"S; 51°57'14"W], 1♂, 2.III.2001 ( MPEG 11278View Materials)GoogleMaps  .

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 ‒BView FIGURE 37, 44A ‒BView FIGURE44, 58G ‒HView FIGURE 58, 61A ‒BView FIGURE 61), metatarsi IV ( Figs 36FView FIGURE 36, 43FView FIGURE 43, 58FView FIGURE 58, 60FView FIGURE 60), 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 ‒EView FIGURE 43); females differ from these species by the presence of a ventral lobe less sinuous ( Fig. 44C ‒DView FIGURE44).

Description. Male (Paratype—Barro Colorado Island—AMNH). Carapace and chelicerae brownish orange ( Fig. 43AView FIGURE 43). Endites orange; labium dark orange. Sternum orange, with darker margins, and three pairs of fainted dark marginal areas ( Fig. 43BView FIGURE 43). Palps orange ( Fig. 44A ‒BView FIGURE44). 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 ‒FView FIGURE 43). Abdomen grey, lighter ventrally ( Fig. 43A ‒BView FIGURE 43). 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 ‒BView FIGURE44). Legs: slender and sparsely coated with setae ( Fig. 43C ‒FView FIGURE 43); metatarsi IV sinuous, in lateral view ( Fig. 43FView FIGURE 43); tarsal brush of putative chemosensory setae present in legs II ‒IV, extending to the median region of the metatarsi IV ( Fig. 43FView FIGURE 43). 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 ‒EView FIGURE 43); 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 ‒HView FIGURE 43). 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 ‒JView FIGURE 43). 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 ‒JView FIGURE 43); 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 ‒DView FIGURE44).

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. 68View FIGURE68).


Museum of Comparative Zoology


American Museum of Natural History


Smithsonian Institution, National Museum of Natural History














Ariadna isthmica Beatty, 1970

Giroti, André Marsola & Brescovit, Antonio Domingos 2018

Ariadna isthmica

Beatty 1970: 470