Ariadna tarsalis Banks, 1902,

Giroti, André Marsola & Brescovit, Antonio Domingos, 2018, The taxonomy of the American Ariadna Audouin (Araneae: Synspermiata: Segestriidae), Zootaxa 4400 (1), pp. 1-114: 53-56

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Ariadna tarsalis Banks, 1902


Ariadna tarsalis Banks, 1902 

Figures 6View FIGURE6, 32‒33View FIGURE 32View FIGURE33, 69View FIGURE 69

Ariadna tarsalis Banks, 1902: 57  , pl. 1, fig. 9 (Immature holotype from Culpepper Island (currently Darwin Island) [01°40'01"N; 91°59'56"W], Galapagos Islands, Ecuador, N. Banks leg., deposited in MCZ 23235, examined). — Beatty (1970: 474).— World Spider Catalog (2018).

Dysdera murphyi Chamberlin, 1920: 38  (♀ holotype from Chinchas Island [13°38'24"S; 76°24'00"W], Ica, Peru, 12.X.1919, R.C. Murphy leg., deposited in MCZ, not examined; Paratypes: 2♀, same data from holotype, deposited in AMNH, examined).— Bonnet (1956: 1631).— NEW SYNONYMY.

Ariadna murphyi  — Beatty (1970: 467, Transf. from Dysdera  ).— World Spider Catalog (2018).

Ariadna peruviana Beatty, 1970: 467  , figs 34‒35, 39 (♂ holotype from Lima [12°02'06"S; 77°01'07"W], "in haus", Lima, Peru, 1939, Weyrauch leg., deposited in MCZ 22634View Materials, examined; Paratypes: 1♀ 1imm., same data from holotype, deposited in MCZ 46053View Materials); 1 imm. from Jequetepeque [07°25'S; 79°30'W], La Libertad, Peru, 15.II.1965, L. Peña leg., deposited in MCZ 46054View MaterialsGoogleMaps  ; 4♀ de La Molina [12°04'40"S; 76°54'40"W], 250m, Lima, Peru, I.1961, R. Garcia leg., deposited in MCZ 20277View Materials, all examined—all specimens labeled as “ A. andromeda  ”).— Beatty (1970: 485, Syn.).GoogleMaps 

Synonymy. Beatty (1970) distinguished A. murphyi  from A. tarsalis  and A. peruviana  based on the macrosetae of the metatarsal comb found in legs IV. This character has a low value in species diagnosis due to its variation, even in the legs of the same specimen. After the examination of type specimens of A. tarsalis  , A. peruviana  and A. murphyi  , it was found that the last ones could be considered junior-synonyms of A. tarsalis  . Despite of the variation on the legs I ‒II macrosetae pattern present in the three species, we could not find differences in the morphology of the male and female genitalia. In 1970, Beatty describes Ariadna peruviana  from Lima, Peru, but in the appendix on the end of the study, he synonymizes this species with A. tarsalis  , based in specimens posteriorly received from Galapagos Islands. He considered them similar of those found in Lima. In this revision, this hypothesis is corroborated.

Additional material examined: ECUADOR: GALAPAGOS ISLANDS: Darwin Island: [01°40'01"N; 91°59'56"W], 1♂ 14♀ 5imm., 29.I.1964, D.Q. Cavagnaro leg. ( CAS 9039512View Materials; 9039520); Pinta  Island : S. Coast [00°36'S; 90°39'W], 6♀ 5imm., 25.V.1964, D.Q. Cavagnaro leg. ( CAS 903View Materials 9504)GoogleMaps  ; Playa Ibbetson [00°36'S; 90°39'W], 40m, open Bursera forest , 1♂, 13‒33. III.1992, S. Peck leg. ( RBINS)GoogleMaps  ; 710ft. Asl. , 1♀ 1imm., 8.II.1982, Y. D. Lubin leg. ( MCZ 46069View Materials)  ; Santiago Island: NW Slope [00°15'S; 90°42'W], 600m, 1♀ 1imm., 30.V.1964, D.Q. Cavagnaro leg. ( CAS 9039531View Materials)GoogleMaps  ; N-flank, 200m, 2♀, 4.III.1986, L. Baert et al. leg. (RBINS); 1imm., VIII.1924, P.H. Johnson leg. (NHM 1926.I.24.24); Isabela Island: Punta Albermale [00°30'S; 91°04'W], SW of old US radar site, ± 10m, 1♀, 28.III.1970, R. Silberglied leg. ( MCZ 46066View Materials)GoogleMaps  ; San Cristobal Island: vic. " El Junco " (crater lake) [00°48'S; 89°24'W], alt. ± 700m, 1♂, 15‒16.IV.1970, R. Silberglied leg. ( MCZ 46149View Materials)GoogleMaps  ; Santa Fé Island: South Coast [00°49'12"S; 90°03'36"W], 1♀, 30.I.1983, Y.D. Lubin leg. ( MCZ 46068View Materials)GoogleMaps  ; ECUADOR CONTINENTAL: Azuay Province: Cuenca [02°53'57''S; 79°00'55''W], Lago Zurucuchu, 11 mi. W of Cuenca , 1♀, 16.XI.1955, E.I. Schlinger & E.S. Ross leg. ( AMNH)GoogleMaps  ; Cuenca [02°53'57''S; 79°00'55''W], 1♀ 1imm., D.L. & H.E. Frizzel. leg. ( CAS 9039534View Materials)GoogleMaps  ; PERU: Piura Department: Negritos [04°39'14"S; 81°18'16"W], 1♂ 1♀, III.1941, H.E. Frizzel leg. ( CAS 9039505View Materials)GoogleMaps  ; 6♀ 4imm., 18.XI.1939 (CAS 9039509); 6♀ 21imm., 12.X.1941 (CAS 9039539); 1♀, XI.1939 (CAS 9039543); 5♀ 3imm., 7.XI.1939, D.L. & H.E. Frizzel leg. (CAS 9039530); 1♂, VIII.1939 (CAS 9039547); 1♀, 5.I.1942, B. Vivas leg. (CAS 9039553); Pariñas Valley, 15km NE of Negritos , 1♀, 16.X.1938, D.L. & H.E. Frizzel leg. ( CAS 9039551View Materials)  ; Ancash Department: Huarmey [10°04'07"S; 78°09'37"W], Huacho , 1♀ 1imm., 23.I.1984, G. Mayo leg. ( MUSM 0504968)GoogleMaps  ; Lima Department: Mazorca Island (11°23'10''S; 77°44'26''W), 2♂ 4imm., II.1978, D. Duffey leg. ( AMNH)GoogleMaps  ; Matucana [11°50'41"S; 76°23'10"W], 2389m, 1♀, 30.IX.1952, F. Blancas leg. ( MUSM 0504969)GoogleMaps  ; Lima [12°02'06"S; 77°01'07"W], Interior MUSMGoogleMaps  Entomologia, 1♂, 7.X.2009, D. Silva-Dávila leg. ( MUSM 0504972); Lima [12°02'06"S; 77°01'07"W], Interior do Museo GoogleMaps  , 31♀ 2imm., IX.1948, Blancas leg. (MUSM 0504980); Lima, Barbones [12°03'16"S; 77°00'35"W], 1♂ 8♀ 2imm., 22.IV.1948, F. Blancas leg. ( MUSM 0504979)GoogleMaps  ; Lima, Chorrillos [12°10'S; 77°02'W], 20♀ 2imm., 12.X.1954, F. Blancas leg. ( MUSM 0504981)GoogleMaps  ; Lima [12°02'06"S; 77°01'07"W], 1♀, VI.1967, C. del Cicuillo & Dr. Meneses leg. ( IBSP 3012View Materials)GoogleMaps  ; 3♂1♀, 1939, Weyrauch leg. (CAS 9039516); same locality, 1imm., 9.I.1955, E.I. Schlinger & E.S. Ross leg. ( A. peruviana  , paratype, not included in Beatty (1970), AMNH)GoogleMaps  ; same locality, 1imm., 10.I.1965, unknown collector (MACN-Ar 21362); Lunahuana , 423m (12°59'09.2"S; 76°09'29.2"W), 2♂ 5♀ 1imm., 18. VI.2012, A.D. Brescovit et al. leg. ( IBSP 166777View Materials)GoogleMaps  ; Carretera Canta km36 [11°28'S; 76°37'W], 1♀, I.1968, Q. Meneses leg. ( IBSP 3013View Materials)GoogleMaps  ; Ica Department: Pisco, South Chincha Island [13°38'76"S; 76°24'00"W], 2♀ 4imm., 23.II.1935 ( AMNH)  ; Ica [14°04'S; 75°44'W], Casallai Pisco , 1♂ 1♀ ( MUSM 0504974)GoogleMaps  .

Diagnosis. Ariadna tarsalis  is similar to A. obscura  , A. arthuri  , A. multispinosa  , A. reginae  n. sp. and A. aurea  n. sp. due to the morphology of the male metatarsi I ( Figs 6A ‒DView FIGURE6, 16C ‒EView FIGURE 16, 32C ‒EView FIGURE 32, 38C ‒EView FIGURE38, 54C ‒EView FIGURE54, 56C ‒EView FIGURE 56) and macrosetae pattern of the tibia I ‒II of females, but differ by the presence of males with metatarsi I with two apophyses on the proximal region, bearing thick macrosetae and a ventro-prolateral truncated macroseta on the distal region ( Fig. 6A ‒DView FIGURE6, 32C ‒EView FIGURE 32); females differ, except from A. multispinosa  , by the presence of the anterior receptaculum with very sinuous lobes, and extremities in opposite direction; it differs from A. multispinosa  by presenting more elongated lobes ( Fig. 33C ‒DView FIGURE33).

Description. Male (Playa Ibbetson, Pinta  Island—RBINS). Carapace and chelicerae brownish orange ( Fig. 32AView FIGURE 32). Endites orange; labium dark orange. Sternum orange, with darker margins ( Fig. 32BView FIGURE 32). Palps yellow ( Fig. 33A ‒BView FIGURE33). Legs yellow, with pairs I ‒II darker ( Fig. 32C ‒EView FIGURE 32). Abdomen light grey, darker dorsally ( Fig. 32A ‒BView FIGURE 32). Total length 8.08; carapace 3.96 long, 2.56 wide. Chelicerae projected ( Fig. 32AView FIGURE 32). Palps: tibia incrassated, with dorso-ventral diameter slightly shorter than the bulb; rounded bulb, mid-portion slightly shorter than the embolus; embolus tubular, curved and tapered ( Fig. 33A ‒BView FIGURE33). Legs: robust and coated with setae ( Fig. 32C ‒EView FIGURE 32); tibia I with the distal ventro-retrolateral macroseta lanceolated and sinuous ( Fig. 32DView FIGURE 32); tarsal brush of putative chemosensory setae present in legs I ‒IV, but reduced in pair I and IV. Leg formula: I-II-IV-III. Leg measurements: I, femur 3.92, patella 1.44, tibia 3.24, metatarsus 3.12, tarsus 0.92, total 12.64; II, 3.72, 1.32, 3.12, 3.2, 0.88, 12.24; III, 2.68, 1.12, 2.04, 2.16, 0.72, 8.72; IV, 3.12, 1.44, 2.64, 2.48, 0.8, 10.48. Macrosetae: I, femur D0-0-0-2/1-0-2-0, P0-0-0-0-2/1- 1-0; tibia D0-0-0-0-0-1-0, P0-1-0-1-0-1-0, vp1-0-1-0-1/0-0-0, vr2-1-1-1-1-1-1-1(lanceolated), R0-1-0-1-0-1-0; metatarsus P0-0-1(truncated/apophysis)-0-0-0-0, vp1-0-0-0-0-0-1(truncated), vr0-0-0-0-0-0-1, R1(digitiform/ apophysis)-0-0-0-0-0-0 ( Fig. 6A ‒BView FIGURE6, 32C ‒EView FIGURE 32); II, femur D0-0/1-1-1/2-0-2-0, P0-0-0-0-1-1-0; tibia D0-0-0-0-0-1/0- 0, P0-1-0-1-0-1-0, vp1-0-1-0-1/0-0-1/0, vr2-0-1-0-1-0-1, R1-0-1-1-1/0-1-0; metatarsus P0-1-0-0-0-0-0, vp1-0-0-1- 0-0-1, vr1-0-0-1-0-0-1, R1-0-1-0-1-0-0; IV, femur D2/1-1-1-1-0/1-1-0/1-1-0-0; tibia vp0-0-0-0-0-0-1, vr0-0-0-0-0- 0-1; metatarsus P0-0-0-1/0-0-0-1, vp0-0-0-1-0-0-1, vr metatarsal comb with 2 macrosetae.

Female (N-flank, Santiago Island—RBINS). Carapace brownish orange; chelicerae dark brownish orange ( Fig. 32F ‒GView FIGURE 32). Endites orange; labium dark orange. Sternum orange, with darker margins, and three pairs of fainted dark marginal areas ( Fig. 32GView FIGURE 32). Palps orange, gradually darkening to distal direction ( Fig. 32F ‒GView FIGURE 32). Legs orange, with pairs I ‒II darker; metatarsi and tarsi of legs I ‒II reddish brown ( Fig. 32H ‒IView FIGURE 32). Abdomen as in male ( Fig. 32F ‒GView FIGURE 32). Total length 9.52; carapace 4.44 long, 2.88 wide. Carapace with cephalic region elevated. Chelicerae not projected ( Fig. 32FView FIGURE 32). Legs: robust and coated with setae; legs I ‒II with ventro-prolateral and ventro-retrolateral tibial and metatarsal macrosetae of different sizes ( Fig. 32H ‒IView FIGURE 32). Leg formula: I-II-IV-III. Leg measurements: I, femur 3.04, patella 1.4, tibia 2.36, metatarsus 2.08, tarsus 0.6, total 9.48; II, 2.8, 1.4, 2.36, 2.0, 0.68, 9.24; III, 2.28, 1.2, 1.6, 1.56, 0.6, 7.24; IV, 2.8, 1.48, 2.44, 1.84, 0.64, 9.2. Macrosetae: I, femur D0-0-0-0-0-2-0, P0-0-0-0-1/2-1-0; tibia P1-0-0-0-0-0-0, vp1-1-1-1-1-1-1, vr1-1-1-1-1-1-1, R0-1-0-1-0-1/0-0 ( Fig. 32H ‒IView FIGURE 32); metatarsus vp1-1-1-1-1-1- 1-1, vr1-1-1-1-1-1-1-1; II, femur D0-0-0-0-0-1-0, P0-0-0-0-0-0-1-0; tibia P0-1/0-0-0/1-0-0-0, vp1-0-1-0-1-0-1, vr1-1-1-1-1-1-1, R0-1/0-0-0-0-0-0; metatarsus vp1-1-1-1-1-1-1-1, vr1-1-1-1-1/0-1-1-1; IV, metatarsus vp0-0-0-0- 0-0-1, vr metatarsal comb with 3 macrosetae. Internal genitalia: anterior receptaculum with the dorsal lobe shorter than the ventral lobe, and glandular ducts plate in the median region of the receptaculum, not expanded ( Fig. 33C ‒DView FIGURE33).

Variation. Male (n=10): Total length 5.04‒8.08; carapace 2.48‒3.96 long, 1.84‒2.64 wide; femur I 2.36‒4.0. Macrosetae: I, tibia D0-0-0-0-0-1-0, P0-1-0-1-0-1-0, vp1-0-1-0-0-0-0, vr1/2-0-1-0-1-0-1(lanceolated), R0-1-0-1-0- 1-0; II, tibia D0-0-0-0-0-1-0, P0-1-0-1-0-1-0, vp0-0-0-0-0-0-1, vr2-0-1-0-1-0-1, R1-0-1-0-1-0-1-0. Female (n=10): Total length 7.4-12.8; carapace 3.45-5.12 long, 2.25-3.44 wide; femur I 2.7‒4.24. Macrosetae: I, tibia P0-1-0-1-0- 1-0, vp1-0-1-0-1-0-1-0, vr1-0-1-0-1-0-1-0, R0-1-0-1-0-1-0; II, tibia P0-1-0-1-0-1-0, vp1-0-1-0-1-0-1-0, vr1-0-1-0- 1-0-1-0, R0-1-0-1-0-1-0.

Distribution. Ecuador (Galapagos Islands and Azuay) and west of Peru ( Fig. 69View FIGURE 69).


Museum of Comparative Zoology


Royal Belgian Institute of Natural Sciences


American Museum of Natural History


Universit� di Perugia














Ariadna tarsalis Banks, 1902

Giroti, André Marsola & Brescovit, Antonio Domingos 2018

Ariadna peruviana

Beatty 1970: 467

Dysdera murphyi Chamberlin, 1920 : 38

ChamBerlin 1920: 38

Ariadna tarsalis

Banks 1902: 57


Latreille 1804