Arctosa tenella ( Keyserling, 1877 ) Paredes-Munguía & Brescovit & Teixeira, 2024

Paredes-Munguía, Williams, Brescovit, Antonio D. & Teixeira, Renato A., 2024, Revision of Neotropical wolf spider genus Arctosa C. L. Koch, 1847 (Araneae: Lycosidae), with description of seven new species, Zootaxa 5414 (1), pp. 1-83 : 45-51

Arctosa tenella ( Keyserling, 1877) comb. nov.

Figs 38‒43 , 68

Trochosa tenella Keyserling, 1877: 667 , pl. 8, figs 42‒43. Male holotype from St Fé de Bogotá, Colombia, BMNH 1890.1036, examined.

Lycosa tenella : Petrunkevitch 1911: 568.

Arctosa minuta F.O. Pickard-Cambridge, 1902: 331 , pl. 31, figs 26‒27. Male holotype and female paratype from Guatemala, BMNH, examined by photographs. Dondale & Redner 1983a: 21, figs 50‒56; Jiménez et al. 2018: 5, figs 9‒10. Syn. Nov.

Arctosa cheluncata Petrunkevitch, 1925: 177 , figs 94‒96. Female syntype from Remedios, Panama; two male, three females, and one juvenile syntypes from Santiago , Panama ; one male, one female, and one juvenile syntypes from Wilcox camp, San Lorenzo River , Panama ; one juvenile syntype from La Mesa , Panama , all in PMNH, not examined. Synonymized by Dondale & Redner 1983a.

Arkalosula cheluncata : Roewer 1955: 232.

Other material examined: COLOMBIA: Bolívar: Turbaco : 4♂ 5♀, Jardín Botánico Guillermo Piñeres , 118 m, 14.ii.2020, D. V. Moreno, W. P. Munguia & A. Segovia leg. (ICN-Ar) . Cauca: 1♂ 1♀, Guapi, Parque Nacional Isla Gorgona , ca. 2°58'6.0"N 78°11'4.00"W, 5 m, vii.2003 , A. Rico et al. leg. (ICN-Ar 2577). Caquetá: 1♀, Puerto Rico , El Lobo, ca. 1°30'55.36"N 74°50'6.04"W, 232 m, 10.i.2020, M. Ribero leg. (ICN-Ar 12758) . Guaviare: 1♀, San José del Guaviare, Isla de la Laguna Negra, Vereda Playa Guio , ca. 2°34'19.44"N 72°42'53.85"W, 212 m, 27.x.2012, (ICN-Ar 10071) . Meta: 1♂, Villavicencio , ca. 4°08'36.26"N 73°55'56.69"W, 408 m, 15.x.2014, E. Quiñones leg. (ICN-Ar 10061) . Tolima: 1♀, San Luis, Cultivo de Guanabana , 4°08'25.26"N 75°06'10.32"W, 420 m, 27.iv.1992, A. Castillo leg. (ICN-Ar 10045) ; 1♂, San Luis , 4°08'01.93"N 75°06'11.80"W, 400 m, 10.vi.1992, A. Castillo leg. (ICN-Ar 10049) . ECUADOR: Loja: Malacatos , ca. 4°12'58.0"S 79°11'04.00"W, 1481 m, 27.xii.2006, D. Mora leg. ( QCAZ) . Pichincha: 1♂, Mindo , 0°02'S 78°46'4"W, 1500 m, 19.xi.1997, T. Romero leg. ( QCAZ) ; 1♀, Palmeras , ca. 0°13'44.53"N 78°42'08.35"W, 1930 m, 7.xi.1992, J. Mancheno leg. ( QCAZ) . Manabi: 1♀, El Carmen, Km 40 Via Santo Domingo-Chone , 250 m, ca. 0°16'31.42"S 79°35'06.70"W, 250 m, 28.xii.1995, Jaramillo leg. ( QCAZ) ; 1♀, Rio Ayampe , 20 m, ca. 1°40'24.46"S 80°42'10.77"W, 27.xii.1992, L. de la Torre leg. ( QCAZ) . PERU: Tumbes: 2♂ 1♀, Corrales, Facultad de Ciencias Agrarias UNT, xi.2018, P. Castillo leg. ( MUSM-ENT 513519 ) . Cajamarca. 1♂, Huarapomayo, Choropampa, 6°21'29.61"S 78°19'30.46"W, 619 m, Bosque Seco , 16.ix.2015, J. Pacheco leg. ( MUSM-ENT 508928 ) .

Diagnosis. Males of Arctosa tenella are recognizable among all other neotropical species by the embolus concealed by the median apophysis, retrolateral arm of median apophysis grooved, curved, and pointed ( Figs 38c , 39d ); posterior arm of median apophysis lamellar and ventrally projected ( Figs 39d , 43c ); terminal apophysis (TA) curved, thin and flat, with its basal part more sclerotized than the distal end ( Figs 38a , 39b ). Females of are recognized by the transversal septum (TS) projected posteriorly and curved ( Figs 42b ), the head of the spermatheca rounded, the stalk of spermatheca thin, and the fertilization ducts robust ( Figs 41d , 42d ).

Description. Male (MUSM-ENT 508928). Carapace dorsally covered with little black hairs, dark yellow, with irregular yellow longitudinal median band from the ocular area until fovea, discontinuous submarginal bands. Sternum yellow sparsely covered with brown bristles ( Fig. 40c ). Ocular area black covered by sparse black setae and some short white ones; four long black bristles on the clypeal condyle anteriorly of AER. First row of eyes procurved and shorter than the second row; AME slightly bigger than ALE; ALE resting on tubercles distally oriented; PME separated by more than half the length of its radii. Labium brown covered with brown bristles the same color as the chelicerae; chelicerae with two promarginal teeth and three retromarginal all equal in sizes, condyle short and poorly notorious; protuberance on cheliceral fang. Legs yellow; femora yellowish annuli ( Fig. 40b, c ). All tarsi with no scopula, spinules on tarsi III‒IV stronger than in tarsi I‒II; trichobothria in tibiae, tarsi and metatarsi distally increasing in size. Opisthosoma olive gray, dorsally the area near the pedicel is with long white bristles, pale gray lanceolate mark on the cardiac area flanked with irregular but symmetric yellow spots at both sides, venter yellow, spinnerets dark yellow.

Pedipalp ( Fig 38a‒c , 39a‒i , 40d‒e ) with a cylindrical tibia, a ventral patch of bristles arranged in a dispersal way on the femur. Cymbium piriform with six apical spines ( Fig. 39i ); tegulum with a rounded basal notch, lamellar curved terminal apophysis ( Figs 40d , 43a ); posterior arm lamellar and a retrolateral arm of median apophysis with dorsally keeled, beaklike, and curved in ventral view, conductor lamellar ( Fig. 43b ) The sperm duct runs diagonally through the tegulum in a clockwise way ( Fig. 39e ). Embolus straight directed transversally from prolateral origin and not twisted ( Figs 39b , 43a )

Leg formula IV>I>II>III. Spination pattern: femur I p 0-0-3 d 1-1-1 r 0-0-d1, II p 1d-1d d 1-1-1 r 1d-1d, III p 1d- 1d d 1-1-1 r d1-1d, IV p 1d-0-1d d 1-1-1 r 0-0-1d; patella I p 1 d 1bristle-1bristle ap r 1, II p 1 d 1bristle-1bristle ap r 1, III p 1 d 1bristle-1 bristle ap r 1, IV p 1 d 1bristle -1bristle ap r 1; tibia I p 1-1 v 2-2-2ap r 1-1, II p 1d-1 v 2-2-2ap r 1-1, III p 1d-1 d 1-1 r 1d-1 v 2-1-2ap, IV p 1-1 d 1-1 r 1-1 v 2-2-2ap; metatarsus I p 1d-1d-2ap r 1d-1d-2ap v 2-2-1ap, II p 1d- 1d-2ap r 1d-1d-2ap v 2-2-1ap, III p 1d-1-2ap r 1d-1-2ap v 2-2-1ap, IV p 1d-1d-2ap r 1d-1d-2ap v 2-2-1ap.

Measurements: TL 6.44, CL 3.44, CCW 1.45, CTW 2.57, CCH 1.31, CTH 1.57. Eyes: AME 0.17, ALE 0.13, PME 0.31, PLE 0.26, interdistances: AME-AME 0.11, AME-ALE 0.05, PME-PME 0.24, POQ length 0.54, POQ posterior width 0.80, POQ anterior width 0.54. Chelicerae: length 1.55. Legs: length of segments (femur + patella + tibia + metatarsus + tarsus = total length): pedipalp 1.45 + 0.36 + 0.69 + - + 0.71 = 3.21, I 2.57 + 1.14 + 2.02 + 1.98 + 1.26 = 8.97, II 2.24 + 1.12 + 1.86 + 2.00 + 1.21 = 8.43, III 2.21 + 0.97 + 1.57 + 2.17 + 1.09 = 8.01, IV 3.12 + 1.24 + 2.62 + 3.50 + 1.52 = 12.00.

Female (ICN-Ar 2577). Coloration as in male. All legs with the same color patterns. Coloration and setae arrangement as in male.

pigyne hoodless, transversal septum curved ( Fig. 42b ); fertilization duct visible big and membranous ( Figs 41b, d ). Copulatory duct narrows at extremes of transversal septum. Internally spermatheca is rounded, ( Figs 41b , 42d ), vulval chamber easily to recognize and separate the stalk of spermatheca ( Figs 41c , 42b ).

Variation. Females N=5 (males N=5) (range, mean±s.d.): TL 6.07 – 9.40, 7.41±0.79; CL 3.43 – 4.04, 3.86±0.17; CW 2.74 – 3.33, 3.03±0.15; (TL 5.10 – 7.74, 6.94±0.83; CL 2.80 – 4.04, 3.51±0.49; CW 2.30 – 3.03, 2.82±0.21).

Distribution. USA ( Dondale & Redner 1983a), Mexico ( Jiménez et al., 2018), Guatemala (F.O. Pickard-Cambridge 1902), Colombia, Ecuador and Peru ( Fig. 68 ).

Figures

FIGURE 38. Arctosa tenella (Keyserling, 1877) comb. nov. Male palp (ICN-Ar 2577) (a, ventral; b, retrolateral; c, apical). Scale bars: a–c, 0.25 mm. Pa posterior arm, Ra Retrolateral arm, TA terminal apophysis.

FIGURE 39. Arctosa tenella (Keyserling, 1877) comb. nov. Male palp (ICN-Ar 2577) a–c, i (a, retrolateral; b, ventral; c, prolateral; i, cymbium dorsal view). Pedipalp bulb (MUSM-ENT 508928) d–h (d, retrolateral; e, ventral; f, prolateral, g, basal, h, apical,) Scale bars: a–c, 0.2 mm, d–h, 100 µm, i, 200 µm. C conductor, CMS cymbium setae, DMA depression of median apophysis, E embolus, Pa posterior arm, Ra retrolateral arm, ST subtegulum, T tegulum, TA terminal apophysis.

FIGURE 40. Arctosa tenella (Keyserling, 1877) comb. nov. Male habitus (ICN-Ar 2577) a–c (a, dorsal; b, lateral; c, ventral). Pedipalp, expanded d–e (d, prolateral; e, anterior). Scale bars: a–c 1 mm, d–e 150 µm. BH basal hematodocha, DH distal hematodocha, MA median apophysis, Pa posterior arm, Ra retrolateral arm, ST subtegulum, TA terminal apophysis.

FIGURE 41. Arctosa tenella (Keyserling, 1877) comb. nov. Epigynum (ICN-Ar 2577) (a, ventral; b, dorsal; c, posterolateral; d, posterior). Scale bars: a–d, 0.25 mm. CO copulatory opening, HS head of spermatheca, FD fertilization duct, MS median septum, VC vulval chamber.

FIGURE 42. Arctosa tenella (Keyserling, 1877) comb. nov. Female habitus (ICN-Ar 2577) a, c (a, dorsal; c, lateral). Epigynum, b, d (b, ventral; d, dorsal) Scale bars: a, c, 2 mm, b, d, 0.1 mm. HS head of spermatheca, MS median septum, SS stalk of spermatheca, TS transversal septum, VC vulval chamber.

FIGURE 43. Arctosa tenella (Keyserling, 1877) comb. nov. Male palpal bulb SEM (MUSM-ENT 508928) a–c (a, ventral; b, conductor detail; c, MA details). Scale bars: a, 150 µm, b–c, 50 µm. C conductor, E embolus, Pa posterior arm, Ra retrolateral arm, ST subtegulum, TA terminal apophysis.

FIGURE 68. Geographic distribution records of Arctosa tenella comb. nov. (rose square).