Ariadna arthuri Petrunkevitch 1926
Creators: name: Giroti, André Marsola
name: Brescovit, Antonio Domingos
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Segestriidae
Ariadna
Ariadna arthuri

description: Ariadna arthuri Petrunkevitch, 1926
Figures 38‒39, 68
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); 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; 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); Big Pine Key [24°41'10"N; 81°21'40"W], 1♀, 29.XII.1956, F. & C. Phillips leg. (MCZ 128431; 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); 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); Holguín Province: Moa, El Toldo [20°38'23"N; 74°55'03"W], 2♀ 4imm., 2.XI.1997, A. Foug leg. (IBSP 166772); Guantánamo Province: Baracoa, Parque Nacional Humboldt [20°27'N; 75°00'W], 2♀ 1imm., 2.III. 1 998, A. Sánchez leg. (IBSP 166773); 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); 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).
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, 32C‒E, 38C‒E, 54C‒E, 56C‒E) 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); 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).
Description. Male (IBSP 166771): Carapace and chelicerae orange (Fig. 38A). Endites yellow; labium dark yellow. Sternum light yellow, with darker margins, and marbled with dark pigment, also present in the labium (Fig. 38B). Palps light yellow (Fig. 39A‒B). Legs yellow with pairs I‒II darker (Fig. 38C‒E). Abdomen light grey, darker dorsally (Fig. 38A‒B). Total length 4.36; carapace 2.16 long, 1.52 wide. Chelicerae projected (Fig. 38A). 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). Legs: robust and sparsely coated with setae (Fig. 38C‒E); 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); 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). Endites orange; labium dark orange. Sternum light orange, with darker margins, and marbled with dark pigment (Fig. 38G). Palps orange, gradually darkening to distal direction (Fig. 38F‒G). 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). Abdomen as in male (Fig. 38F‒G). 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). 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). 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); 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).
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).
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 64-65, DOI: 10.11646/zootaxa.4400.1.1, http://zenodo.org/record/1207641