Strotarchus silvae, Bonaldo, Alexandre B., Saturnino, Regiane, Ramírez, Martín J. & Brescovit, Antonio D., 2012

Bonaldo, Alexandre B., Saturnino, Regiane, Ramírez, Martín J. & Brescovit, Antonio D., 2012, A revision of the American spider genus Strotarchus Simon, 1888 (Araneae: Dionycha, Systariinae), Zootaxa 3363, pp. 1-37 : 27-28

Strotarchus silvae new species

Figs. 58−61 , 101−102

Type material. Male holotype from Zona Reservada Pakitza, Madre de Dios, Peru (11º58'S, 71º18'W), Oct. 4, 1987, J. Coddington & R. Acero coll.; male paratype, Sept. 27, 1987, J. Coddington & D. Silva coll.; male paratype, Rio Tambopata, Albergue Sachavacayoc, Madre de Dios, Peru, (12º51'21”S, 69º21'43”W), Aug. 10 –17.1996, J. Ochoa coll.; all deposited in USNM.

Etymology. The specific name is a patronym in honor of arachnologist Diana Silva Davila, one of the collectors of the types.

Diagnosis. Males of Strotarchus silvae n. sp. resemble those of Strotarchus urarina n. sp. by the u-shaped proximal fold of reservoir, the embolar base visible retrolaterally in ventral view of unexpanded bulb and by the embolar apices arising retrolaterally but is readly recognised by the extremely elongated, strongly curved ventrally cymbium ( Figs. 101, 102 ).

Description. Male (Holotype). Carapace orange, margins paler. Chelicera red brown. Endites and labium red brown with white apex. Sternum yellow, with brown margins. Legs orange, with base of the articles darker. Abdomen light gray, spinnerets yellow. Total length 5.00. Carapace 2.10 long, 1.80 wide. Eye diameters: AME 0.20, ALE 0.18, PME 0.20, PLE 0.18. Chelicerae with 3 promarginal teeth, the median largest, and 2 retromarginal teeth, separated by five times their width. Leg measurements: femur I 2.20/ II 2.00/ III 1.60/ IV 2.10. Leg spination: Ifemur d1-1-0, p0-1-1, r0; tibia d0, p0-1-0, r0, v2-2 -0; metatarsus d0-1-0, p1-1-2, r0-1-1, v2-2 - 1m. II—femur d1-1- 0, p0-0-1, r0; tibia d0, p0-1-1, r0, v1 r-2-0; metatarsus d0, p1-1-2, r0-1-1, v2-2 - 1m. III—femur d1-1-0, p0-0-1, r0-0- 1; tibia d0-1-0, p1-1-2, r1-1-0, v0-1p-0; metatarsus d0-1-0, p1-1-2, r1-1-2, v2-2 - 1m. IV—femur d1-1-0, p0-0-1, r0- 0-1; tibia d0-1-0, p1-1-0, r1-1-0, v1 p-1p-0; metatarsus d0-1-0, p1-1-2, r1-1-2, v2-2 - 1m. Palpal tibiae extremely short, approximately one sixth of cymbium length; RTA square; ppRTA small, laRTA absent. Tegulum small, subsquared, proximal fold of reservoir thick, u-shaped; TA inconspicuous; EB visible ventrally as a large, retrolateral triangular area between tegulum and BEF in unexpanded bulb; BEF wide, traversing apical portion of tegulum but obliquely displaced; EP small, sub-triangular, apically truncated; EA extremely long, arising retrolaterally ( Figs. 101, 102 ).

Variation. Two males: total length 5.00−5.50; carapace 2.10−2.30; femur I 2.20−2.40.

Distribution. Known only from the type locality.

Other material examined. None.

Figures

FIGURES 58 – 65. Strotarchus silvae new species, male, palp expanded: 58) dorsolateral; 59) ventral; 60) retrolateral; 61) prolateral. Strotarchus piscatorius (Hentz, 1847), male, palp expanded: 62) dorsal; 63) ventral; 64) prolateral; 65) retrolateral. Abbreviations: BEF—Basal embolar fold; Cy ― Cymbium; EA ― Embolar apex; EB ― Embolar basis; EP ― Embolar process; MH ― Median haematodocha; P ― Petiole; R—Reservoir; ST ― Subtegulum; T ― Tegulum.

FIGURES 97 – 102. Strotarchus gandu new species, male: 97) palp, ventral; 98) palp, retrolateral; female: 99) epigynum, ventral; 100) epigynum, dorsal. Strotarchus silvae new species, male: 101) palp, ventral; 102) palp, retrolateral. Abbreviations: BEF ― Basal embolar fold; EA ― Embolar apex; EP ― Embolar process; TA ― tegular apophysis. Scale bar = 0.5 mm.