Ariadna arthuri Petrunkevitch, 1926

Giroti, André Marsola & Brescovit, Antonio Domingos, 2018, The taxonomy of the American Ariadna Audouin (Araneae: Synspermiata: Segestriidae), Zootaxa 4400 (1), pp. 1-114: 64-65

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Ariadna arthuri Petrunkevitch, 1926


Ariadna arthuri Petrunkevitch, 1926  

Figures 38‒39 View FIGURE38 View FIGURE39 , 68 View FIGURE68

Ariadna arthuri Petrunkevitch, 1926: 48   , figs 8‒10 (Immature holotype from Santa Maria Bay, Saint Thomas [18°21'52"N; 64°59'47"W], Virgin Islands, Lesser Antilles, deposited in Peabody Museum, not examined).— Petrunkevitch (1929: 59, fig. 41).— Beatty (1970: 472, figs 8‒9, 26‒27, 32).— World Spider Catalog (2018).

Note. This species was identified based on the descriptions and illustrations of specimens identified by Beatty (1970). The specimens examined in this study are identified as “J.A.B.”. after the collection number.

Material examined. UNITED STATES OF AMERICA: Florida State: Monroe County: Squirrel Key [24°40'38"N; 81°37'23"W], 1♀, 29.VIII.1967, R. Silberglied leg. ( MCZ 46081 View Materials ) GoogleMaps   ; Squirrel Key, opposite E-1, under bark of red mangrove [24°40'38"N; 81°37'23"W], 1♀, 4.VII.1967, R. Silberglied leg. ( MCZ 128432 View Materials ; J.A.B.); Key E-2, east side of Upper Snipe Key , Lower Keys [24°40'40"N; 81°39'09"W], 1♀, 12.VI.1966, D. Simberloff & E.O. Wilson leg. ( MCZ 46152 View Materials ) GoogleMaps   ; Big Pine Key [24°41'10"N; 81°21'40"W], 1♀, 29.XII.1956, F. & C. Phillips leg. ( MCZ 128431 View Materials ; J.A.B.); CUBA: Villa Clara Province: Santa Clara, Prosa Ochoa y Ochoyta [22°24'24,91"N; 79°57'53,78"W], 2♀ 2imm., 26.V.2006, R. Teruel leg. ( IBSP 166774 View Materials ) GoogleMaps   ; Camagüey Province: Camagüey, Sierra de Cubitas; Limones-Tuabaquey Ecological Reserve [21°34'56,69"N; 77°45'0,47"W], 1♂ 4♀ 5imm., III ‒IV.2012, CarBio T. leg. ( IBSP 166771 View Materials ) GoogleMaps   ; Holguín Province: Moa, El Toldo [20°38'23"N; 74°55'03"W], 2♀ 4imm., 2.XI.1997, A. Foug leg. ( IBSP 166772 View Materials ) GoogleMaps   ; Guantánamo Province: Baracoa, Parque Nacional Humboldt [20°27'N; 75°00'W], 2♀ 1imm., 2.III. 1 998, A. Sánchez leg. ( IBSP 166773 View Materials ) GoogleMaps   ; Santiago de Cuba Province: Santiago de Cuba, Sierra Cristal , La China, 640m (20°27'33.5"N; 75°32'06.1"W), 1♀, 2.XI.2009, A. Sánchez leg. ( IBSP 166775 View Materials ) GoogleMaps   ; Santiago de Cuba, Silvarey, Cueva Atabex (19°57'41.1"N; 75°42'56.1"W), 1♀, 19.III.1998, A. Sánchez leg. ( IBSP 166776 View Materials ) GoogleMaps   .

Diagnosis. Ariadna arthuri   is similar to A. obscura   , A. tarsalis   , A. multispinosa   , A. reginae   n. sp. and A. aurea   n. sp. due to the morphology of the male metatarsi I ( Figs 16C ‒E View FIGURE 16 , 32C ‒E View FIGURE 32 , 38C ‒E View FIGURE38 , 54C ‒E View FIGURE54 , 56C ‒E View FIGURE 56 ) and macrosetae pattern of the tibia I ‒II of females, but differ by the presence of males with a sinuous metatarsi I, with two apophyses on the distal region, bearing thickened macrosetae ( Fig. 38C ‒E View FIGURE38 ); females differ by the presence of the anterior receptaculum with a sinuous dorsal lobe and a expanded ventral lobe, mainly at the base ( Fig. 39C ‒D View FIGURE39 ).

Description. Male ( IBSP 166771): Carapace and chelicerae orange ( Fig. 38A View FIGURE38 ). Endites yellow; labium dark yellow. Sternum light yellow, with darker margins, and marbled with dark pigment, also present in the labium ( Fig. 38B View FIGURE38 ). Palps light yellow ( Fig. 39A ‒B View FIGURE39 ). Legs yellow with pairs I ‒II darker ( Fig. 38C ‒E View FIGURE38 ). Abdomen light grey, darker dorsally ( Fig. 38A ‒B View FIGURE38 ). Total length 4.36; carapace 2.16 long, 1.52 wide. Chelicerae projected ( Fig. 38A View FIGURE38 ). Palps: tibia incrassated, with the dorso-ventral diameter similar to the bulb; rounded bulb, mid-portion shorter than the embolus; embolus tubular, curved and tapered ( Fig. 39A ‒B View FIGURE39 ). Legs: robust and sparsely coated with setae ( Fig. 38C ‒E View FIGURE38 ); tarsal brush of putative chemosensory setae present in legs II ‒IV. Leg formula: I-II-IV-III. Leg measurements: I, femur 2.04, patella 0.8, tibia 2.0, metatarsus 2.08, tarsus 0.56, total 7.48; II, 2.0, 0.72, 1.8, 1.88, 0.65, 7.05; III, 1.56, 0.64, 1.16, 1.16, 0.44, 4.96; IV, 1.68, 0.8, 1.44, 1.24, 0.48, 5.64. Macrosetae: I, femur D0-0-0- 1-0-2-0, P0-0-0-0-1/2-1-0; tibia D0-0-0-0-1-0-0, P1-0-1-0-0-1-0, vp0/1-0-0-0-0-0-0, vr1-1-1-1-1/0-1-1, R0-0/1-0- 1-0-0-1; metatarsus vp1-0-0-0-1(truncated/apophysis)-0-1, vr1-0-0-0-1(truncated/apophysis)-0-1 ( Fig. 38C ‒E View FIGURE38 ); II, femur D0-0-0-1/0-1-2-0, P0-0-0-0-1-1-0; tibia D0-0-0-0-1-0-0, P1-0-1/0-0-0-1-0, vp0-0-0-0-0-0-1, vr2-1-1-1-1-1- 1, R1-0-1-0-1-0-1-0; metatarsus vp1-0-0-1-0-0-1, vr1-1-0-1-0-0-1, r0-1-0-0-0-1-0; IV, metatarsus vp0-0-0-0-0-0-2/ 1, vr metatarsal comb with 2 macrosetae.

Female ( IBSP 166771): Carapace and chelicerae orange ( Fig. 38F View FIGURE38 ). Endites orange; labium dark orange. Sternum light orange, with darker margins, and marbled with dark pigment ( Fig. 38G View FIGURE38 ). Palps orange, gradually darkening to distal direction ( Fig. 38F ‒G View FIGURE38 ). Legs orange with pairs I ‒II darker, and dark conspicuous bands present in the ventral region of the femur, patella, tibia and metatarsus ( Fig. 38H ‒I View FIGURE38 ). Abdomen as in male ( Fig. 38F ‒G View FIGURE38 ). Total length 5.2; carapace 2.52 long, 1.6 wide. Carapace with cephalic region slightly elevated, and wavy margins. Chelicerae not projected ( Fig. 38F View FIGURE38 ). Legs: robust and coated with setae; legs I ‒II with ventro-prolateral and ventroretrolateral tibial macrosetae of similar size, and metatarsal macrosetae of different sizes ( Fig. 38H ‒I View FIGURE38 ). Leg formula: I-II-IV-III. Leg measurements: I, femur 1.76, patella 0.84, tibia 1.6, metatarsus 1.44, tarsus, 0.44, total 6.08; II, 1.6, 0.76, 1.48, 1.28, 0.44, 5.56; III, 1.32, 0.64, 0.96, 0.88, 0.4, 4.2; IV, 1.68, 0.84, 1.36, 1.04, 0.4, 5.32. Macrosetae: I, femur D0-0-0-1/0-0-2-0, P0-0-0-1-1-1-0; tibia P0-1-0-1-0-1-0, vp1-1-1-1-1-1-0, vr1-1-1-1-1-1-1, R0-1-0-1-0-0; metatarsus vp1-1-1-1-1-1-1-1, vr1-1-0/1-1-1-1-1-1 ( Fig. 38H ‒I View FIGURE38 ); II, femur D0-0-0-0-0-2-0, P0-0-0- 0-1-1-0; tibia P0-1-0-0-1-0-0, vp1-1-1-1-1-1-0, vr1-1-1-1-1-1-1, R0-0-1-1-0-0; metatarsus vp1-1-1-1-1-1-1-1, vr1- 1-0/1-1-1-0/1-1; IV, metatarsus vp0-0-0-0-0-0-1, vr metatarsal comb with 2 macrosetae. Internal genitalia: anterior receptaculum with the ventral lobe longer than the dorsal one, and glandular ducts plate located in the median region of the receptaculum, with proximal region expanded ( Fig. 39C ‒D View FIGURE39 ).

Variation. Female (n=10): Total length 4.08‒8.28; carapace 1.84‒3.76 long, 1.16‒2.4 wide; femur I 1.2‒2.6.

Distribution. USA (Florida), Virgin Islands and Cuba ( Fig. 68 View FIGURE68 ).


Museum of Comparative Zoology


Instituto Biologico de Sao Paulo














Ariadna arthuri Petrunkevitch, 1926

Giroti, André Marsola & Brescovit, Antonio Domingos 2018

Ariadna arthuri

Petrunkevitch 1926: 48