Nesticus bacchus, Estol, Narelle & Rodrigues, Everton Nei Lopes, 2017

Estol, Narelle & Rodrigues, Everton Nei Lopes, 2017, A new species and a new record of the spider genus Nesticus (Araneae, Nesticidae) from southern Brazil, Zootaxa 4231 (4), pp. 564-566 : 564-566

Nesticus bacchus new species

( Figs. 1 –6)

Type material. Holotype. Male from Brazil, state of Rio Grande do Sul, Candiota ( Fazenda Miolo , Fortaleza do Seival ,

31°23’S 53°45’W, 220m a.s.l.), 22.IX.2009, J.L.O Rosado leg., deposited in MCN 56407. Paratypes: female, same data

as the holotype, 4.X.2010, deposited in MCN 56408; male, same data as the holotype, 17.V.2010, deposited in IBSP

167863; male, same data as the holotype, 25.XI.2011, deposited in MCTP 39511; all collected by pitfall traps. Etymology. The specific name is taken after Bacchus , the Roman god of wine and agriculture, in reference to the

occurrence of this species in vineyards.

Diagnosis. The male of Nesticus bacchus new species resembles that of N. calilegua Ott & Lise, 2002 (see Ott & Lise 2002: 67, figs 27–29) in the shape of the tegular process, distal portion of the conductor, tegulum and paracymbium processes, but differs in the longer tegular process surpassing the margin of cymbium in ventral view ( Fig. 1 ), by the trajectory of the sperm duct in the tegulum ( Fig. 1 ), the paracymbium dorsal process pointed and hook-shaped, and the ventral process larger and distal portion of the conductor which is wider and with a blunt end in N. bacchus new species ( Fig. 1 ) in contrast with slimmer and more pointed in N. calilegua Ott & Lise, 2002 (see Ott & Lise 2002: 67, fig. 28). Nesticus bacchus new species females resemble N. calilegua Ott & Lise, 2002 (see Ott & Lise 2002: 67, figs 25, 26) in the reniform spermathecae with coiled copulatory ducts, but differs in the shape of posterior margin of median septum, wide anteriorly ( Fig. 5 ) and spermathecae more separated from each other, in ventral view ( Fig. 5 ).

Description. Male holotype. Total length 2.34. Carapace length 0.98, width 0.78. Clypeus height 0.06. Chelicerae length 0.42, width 0.16. Sternum length 0.51, width 0.47. Abdomen length 1.24, width 1.09, height 1.09. Leg formula I/ IV/II/III; segment length (I/II/III/IV): femora 1.29/1.08/0.85/1.29; patellae 0.37/0.37/0.34/0.37; tibiae 1.22/0.68/0.57/ 1.12; metatarsi 1.15/0.85/0.68/1.02; tarsi 0.61/0.54/0.51/0.57; total 4.64/3.52/2.95/4.37. Palpus: femur 0.47; patella 0.13; tibia 0.17; cymbium 0.40; total 1.17. Carapace ( Fig. 4 ) pale-yellow. Thoracic fovea circular, inconspicuous. Eyes with dark borders. ALE and PLE larger than the other eyes, AME smaller. Sternum longer than wide, yellow, margins brown. Chelicerae and endites pale-yellow. Labium wider than long, pale-yellow. Legs ( Fig. 4 ) pale-yellow. Abdomen ( Fig. 4 ) longer than wide, oval, yellow. Spinnerets pale-yellow. Palpal tibia developed. Paracymbium with prominent ventral process strongly sclerotized, median process pointed and dorsal process hook-shaped, larger than the other processes and pointed ( Figs 1, 2 ). Tegular process in prolateral position, developed and not curved ( Figs 1, 3 ). Embolus long and filiform ( Figs 1–3 ). Sperm duct in the tegulum with S-shaped trajectory in ventral view ( Fig. 1 ). Conductor developed, with distal portion and ventral portion elongated ( Figs 1–3 ).

Female. Paratype. Total length 2.49. Carapace length 1.04, width 0.88. Clypeus height 0.16. Chelicerae length 0.46, width 0.20. Sternum length 0.57, width 0.57. Abdomen length 1.61, width 1.24, height 1.24. Leg formula I/IV/II/ III; segment length (I/II/III/IV): femora 1.25/0.91/0.74/1.15; patellae 0.37/0.34/0.30/0.34; tibiae 1.12/0.85/0.57/1.19; metatarsi 0.91/0.71/0.57/0.91; tarsi 0.61/0.51/0.40/0.54; total 4.26/3.32/2.58/4.13. Palpus: femur 0.40; patella 0.10; tibia 0.32; tarsi 0.37; total 1.19. Carapace pale-yellow. Thoracic fovea circular, inconspicuous. Eyes with dark borders. ALE and PLE larger than the other eyes, AME smaller. Sternum longer than wide, yellow with brown spots mainly on the edges. Chelicerae and endites yellow. Labium wider than long, pale-yellow. Legs pale-yellow. Abdomen longer than wide, oval, dorsum yellow, sides with longitudinal brown spots, venter with brown spots. Spinnerets pale-yellow. Palpal tarsus with long claw. Epigynum with median septum wide, with copulatory opening in posterior-median portion of epigynal plate ( Fig. 5 ) and reniform spermathecae with long and coiled copulatory ducts (Fig. 6) and fertilization ducts in posterior portion of epigynum, arising from posterior region of spermathecae (Fig. 6).

Remarks. Males and female were collected together in vineyards ( Vitis vinifera Linnaeus (1758) cv Cabernet Sauvignon), with pitfall traps.

Distribution. Brazil (Rio Grande do Sul).

Figures

FIGURES 1 – 5. Nesticus bacchus new species: 1, male palp, ventral; 2, retrolateral; 3, prolateral; 4, male habitus, dorsal; 5, epigynum, ventral. 6, dorsal view. BPC, basal portion of conductor; C, conductor; CD, copulatory ducts; CO, copulatory opening; Cy, cymbium; DP, paracymbium dorsal process; DPC, distal portion of conductor; E, embolus; FD, fertilization ducts; MP, paracymbium median process; MS, median septum; P, paracymbium; S; spermatheca; ST, subtegulum; TP, tegular process; T, tegulum; Ti, tibia; VP, paracymbium ventral process. Scale bars: Figures 1 – 3, 4: 0.5 mm; 5 – 6: 0.25 mm.