Philisca pizarroi, Soto & Ramírez, 2012

Soto, Eduardo M. & Ramírez, Martín J., 2012, Revision and phylogenetic analysis of the spider genus Philisca Simon (Araneae: Anyphaenidae, Amaurobioidinae) 3443, Zootaxa 3443 (1), pp. 1-65 : 42-45

Philisca pizarroi new species

Figs 24–26 , 32e, f , 35d

Type material: Holotype male and female paratype from Chile, Región V (Valparaíso), Archip. Juan Fernández, Is. Robinson Crusoe, sendero, luego de Mirador Selkirk, ladera W, S33.63749° W78.85155° (GPS, trayecto +- 50m), elev. 460–539m (barómetro), 18–20.II.2011, bosque de luma con helechos arborescentes, M. Ramírez, E. Soto, J. Pizarro ( MHNS; male EMS-00154, female EMS-00153); 1 male and 1 female paratypes from Is. Robinson Crusoe, Plazoleta El Yunque, 200–250m, camote side, 1–28.IV.1962, B. Malkin ( AMNH; male EMS-00077, female EMS-00067).

Etymology: The species is named in honor of the Chilean entomologist Jaime Pizarro Araya (Universidad de La Serena), in recognition of his enormous contribution to the organization and success of the expedition to Juan Fernández in 2011, and for helping collect the type material of this species.

Diagnosis: It resembles other species of the ornata group by the modified male chelicerae and the epigyne with smooth, heart shaped median field close to the epigastric furrow ( Figs 35d , 32e, f ), and is very similar to P. robinson by the contrasted coloration. It can be distinguished from the latter species by lacking the pattern of dark spots in the thoracic area ( Figs 24b , 25b ) and by the presence of a narrow dark band only on the venter of opistosoma ( Figs 24c , 25c ). The females have the accessory bulbs placed more anteriorly from the spermathecae ( Fig. 32f ). As P. robinson , P. pizarroi has a notorious striped appearance. However, the latter species is larger than P. robinson and differs in the dark spotted pattern in general ( Figs 24 , 25 ). Males are distinguished by a few braches in the midsection of the MA ( Fig. 26h ).

Description: Female (paratype MHNS EMS-00153): Total length 8.25. Prosoma length 3.53, width 2.40, wider between legs II–III. Tibia/metatarsus length: I, 2.07/1.80; II, 2.00/1.73; III, 1.53/1.67; IV, 2.27/2.53. Chelicerae with three teeth (middle tooth larger) on promargin, three on retromargin. Sternum length 1.62, width 1.33. Spines: leg I, femur d 1–1–1, p 2ap, r d1ap; tibia v 2–2–2, p 1–1, r 0–v1; metatarsus v 2bas, p and r 0–1–d1. II, femur d 1–1–1, p 0– d1–2ap, r d1ap; tibia v 2–2–2, p d1–1, r 0–1; metatarsus v 2bas, p and r 0–1–d1. III, femur d 1–1–1, p 0–d1–2, r 0– d1–d1; patella r d1; tibia v p1–2–2 or 2–2–2, p d1–1, r 1–d1–1; metatarsus v 2–2–2, d 0–p1–2, p and r d1–1–1 or 0–1– 1. IV, femur d 1–1–1, p 0–d1–d1ap, r d1ap; patella r d1; tibia v 2–2–2, p 1–1, r 1–d1–1; metatarsus v 2–2–2, d 0–p1– 2, p and r d1–1–1. Color in ethanol ( Fig. 24 ): Prosoma and legs are reddish brown, with brown spots. Prosoma in dorsal view with lateral bands of brown. Sternum same color as prosoma but paler in the center. Opisthosoma is yellowish brown with dark brown spots. Opisthosoma length 4.53, epigastrium–spiracle 2.73, spiracle–spinnerets 0.43. Epigyne is small, sclerotized and translucent ( Fig. 32e, f ). MF smooth, heart-shaped, close to the epigastric furrow. Anterior pouch wide, with short lumen. AB anterior to spermathecae, with long ducts.

Male (holotype): Total length 5.87. Prosoma length 2.80, width 2.07. Length of tibia/metatarsus: I, 2.47/2.33; II, 2.40/2.27; III, 1.53/2.13; IV, 2.20/3.00. Chelicerae have modifications ( Fig. 35d ) with three teeth (middle tooth larger) on promargin, three on retromargin. Sternum length 1.37, width 1.12. Spines: leg I, femur d 1–1–1, p 2ap, r d1ap; tibia v 2–2–2 or p1–2–2, p and r 0–1; metatarsus v 2bas–p1, p and r 1–d1. II, femur d 1–1–1, p 0–1–d2 or 0– 1–d1, r d1ap; tibia v 2–2–2, p d1–1, r 0–1; metatarsus v 2bas–p1, p and r 0–1–d1. III, femur d 1–1–1, p and r 0–d1– d1; patella r d1; tibia v 2–2–2, d r1bas, p d1–1, r d1–1–1; metatarsus v 2–p1–2 or 2–2–2, d 0–p1–2, p and r d1–1–1. IV, femur d 1–1–1, p and r d1ap; patella r d1; tibia v 2–2–2, d r1bas, p d1–1, r d1–d1–0–1; metatarsus v 2–2–2, d 0– p1–2, p and r d1–1–1. Opisthosoma length 3.13, spiracle–epigastrium 1.80, spiracle–spinnerets 0.42. Color in ethanol as in female ( Fig. 25 ). Palp ( Fig. 26 ): Tibia width/length 0.41. Embolus normal, thin and cylindrical. MA long and flattened, with a few thin branches in the middle–apical zone ( Fig. 26h ). PMA long and wide, triangular, pPMA simple. Conductor normal and well developed, with clear and distinct canal, ending in longitudinally ridged peak, on rounded projection, directed backwards ( Fig. 26g, h ).

Variability: Spines in males: I, metatarsus v 2bas–0. II, tibia p 0–d1. IV, femur p 0–d1–d1. Spines in females: I, metatarsus v p1bas or 2bas–p1. II, metatarsus v 2–2–0. Adults and immatures may or may not have a group of thick setae on the base of ALS.

Distribution: Known only from the Juan Fernández Islands, Is. Robinson Crusoe, Chile.

Other material examined: CHILE: Región V (Valparaíso): Archip. Juan Fernández: Is. Robinson Crusoe, sendero al Mirador Selkirk, S33.63888° W78.85091° (GPS, trayecto +- 200m), elev. 488m (barómetro), 18.II.2011 , bosque de luma y maqui, con helechos, M. Ramírez, E. Soto, J. Pizarro, 1 female ( UC), 1 female ( MACN-Ar 28041 ), 1 female ( MACN-Ar 28040 ), 1 female ( MACN-Ar 28039 ), 1 female ( MACN-Ar 28038 ); Sendero, luego de Mirador Selkirk , ladera W, S33.63749° W78.85155° (GPS, trayecto +- 50m), elev. 460–539m (barómetro), 18–20.II.2011 , bosque de luma con helechos arborescentes, M. Ramírez, E. Soto, J. Pizarro, 3 females ( MACN-Ar 27976 ), 1 female (MACN- Ar 28033), 1 female ( MACN-Ar 28037 ), 1 female ( MACN-Ar 28036 ), 1 female ( MACN-Ar 27974 ), 1 female (MACN- Ar 27975), 1 male ( MACN-Ar 27977 ), 1 male ( MACN-Ar 27978 ), 1 male ( MACN-Ar 28035 ), 1 male ( MACN-Ar 28042 ), 2 males and 1 immature ( UC), 3 immatures ( MACN-Ar 28034 ); same locality, ladera W, S33.63790° W78.85302° (GPS, trayecto +- 110m), elev. 460–470m (barómetro), 20.II.2011 , bosque de luma con helechos arborescentes, M. Ramírez, E. Soto, J. Pizarro, 15 females and 4 males ( MHNS); El Camote , 600m, 16.IV.1962 , B.

Malkin, 1 female ( AMNH) , 1 female ( MACN-Ar 28043 ) ; slopes of El Yunque , fern covered, pan traps, 28.I.1992, S. Marshall, 1 female and 2 males ( AMNH) ; same locality, site 2, pans, 23–28.I.1992, S. Marshall, 1 male ( AMNH) .

Figures

FIGURE 24. Philisca pizarroi new species (EMS-00153). a–d female paratype (a dorsal habitus; b prosoma, dorsal view; c ventral habitus; d prosoma, ventral view).

FIGURE 25. Philisca pizarroi new species (EMS-00154). a–d male holotype (a dorsal habitus; b prosoma, dorsal view; c ventral habitus; d prosoma, ventral view).

FIGURE 26. Philisca pizarroi new species (EMS-00077 and EMS-00154). Male, a–c left palp (a prolateral view, b ventral view, c retrolateral view); d–h copulatory bulb (d prolateral view, e ventral view, f retrolateral view, g apical view, h apical– retrolateral detail view). (C: conductor, E: embolus, MA: median apophysis, PMA: paramedian apophysis).

FIGURE 32. Epigyne of Philisca species. Philisca atrata (a epigyne, ventral view, EMS-00132; b cleared epigyne, dorsal view, MACN-Ar 28022). Philisca robinson (c epigyne, ventral view; d cleared epigyne, dorsal view; EMS-00068 and EMS- 00155). Philisca pizarroi (e epigyne, ventral view; f cleared epigyne, dorsal view; EMS-00067 and EMS-00153). (AB: accessory bulbs, CD: copulatory ducts, MF: median field, S: spermathecae).

FIGURE 35. Male chelicerae of Philisca species, anterior view. a P. accentifera Simon (EMS-00130). b P. atrata (EMS- 00133). c P. robinson (EMS-00156). d P. pizarroi (EMS-00154). e. P. viernes (EMS-00152).