Pikelinia arenicola , Lise, Arno A., Ferreira, Ana Carla K., Cruz, Estevam L. & Silva, Da, 2010

Lise, Arno A., Ferreira, Ana Carla K., Cruz, Estevam L. & Silva, Da, 2010, Description of a new species of Pikelinia (Araneae: Filistatidae) from Brazil, with notes on its ecology, Zootaxa 2604, pp. 61-68: 62-67

publication ID

10.5281/zenodo.197631

persistent identifier

http://treatment.plazi.org/id/FF6F87DE-FF95-FFB2-FF77-AAAEFE30D117

treatment provided by

Plazi

scientific name

Pikelinia arenicola
status

sp. n.

Pikelinia arenicola  sp. n.

Figs. 1–32View FIGURES 1 – 10View FIGURES 11 – 18View FIGURES 19 – 26View FIGURES 27 – 30View FIGURE 31View FIGURE 32

Type material: Holotype male from Viamão, Parque Estadual de Itapuã, Rio Grande do Sul, Brazil, 18.XI. 2003, Ana Carla K. Ferreira ( MCTPAbout MCTP 19721). Paratypes: same data as holotype, 1 Ƥ ( MCTPAbout MCTP 17881); 1 3, 09.III. 2004, ( MCTPAbout MCTP 17854), 1 3, 26.VI. 2004, ( MCTPAbout MCTP 17860), 1 Ƥ, 17.XII. 2003, ( MCTPAbout MCTP 17857), 1 Ƥ, 30.IV. 2004, ( MCTPAbout MCTP 17863), all from the same locality and collector.

Etymology. The specific name is an adjective in apposition to the generic name and refers to the sandy habitat preferred by this species.

Diagnosis. Males of Pikelinia arenicola  sp. n. resemble those of Pikelinia tambilloi  ( Grismado & Ramírez, 2006: 40, figs. 1–11) by the similar shape of the palpal tibia, but can be distinguished by the tibia being larger, by the different curvature of the apex of the bulb ( Figs. 7, 8 View Figure ) and by a projection on the ventral face of the tarsus ( Figs. 7 View Figure , 14– 16 View Figure ). Females can be distinguished by the shape of the epigastric flap with numerous marginal long feathery setae ( Fig. 6 View Figure ).

Description. Male (Holotype, MCTPAbout MCTP 19721). Total length 2.22. Carapace 1.0 long, 0.70 wide, 0.40 high. Carapace elliptic, convex, narrower on the anterior region, with few bristles ( Figs. 1, 2 View Figure ). General color yellow, shaded with dark brown. Lateral margins bordered with brown. Clypeus 0.18 high. Eyes on mound. Ocular area black. Anterior eye row almost straight, posterior slightly recurved. Eye diameters and eye interdistances: AME 0.04, ALE 0.10, PME 0.08, PLE 0.08, AME-AME 0.04, AME-ALE tangent, PME-PME 0.06, PME- PLE close together. MOQ 0.16 long in dorsal view, anterior width 0.12, posterior width 0.18. Chelicerae 0.24 long, 0.10 wide, yellow, shaded with brown ( Fig. 13 View Figure ). Labium 0.20 long, 0.16 wide, yellow. Endites 0.34 long, 0.10 wide, convergent, light yellow, shaded with brown near the articulation with the palpus, coated with many bristles. Sternum 0.60 long, 0.50 wide, elliptic, yellow, shaded with brown, margins darker. Legs: formula 1.4.2.3; color – light gray shaded with brown. Leg II with curved metatarsus carrying retrolaterally a group of thick macrosetae ( Figs. 9, 10 View Figure , 17, 18 View Figure ). Tarsus curved with prominent claw ( Fig. 22 View Figure ). Leg measurements (length: femur, patella, tibia, metatarsus, tarsus, total): I: 1.64, 0.32, 1.90, 1.44, 0.80, 6.10; II: 1.24, 0.32, 1.20, 0.80, 0.40, 3.96; III: 0.86, 0.30, 0.74, 0.80, 0.50, 3.20; IV: 1.26, 0.34, 1.20, 1.16, 0.56, 4.52. Palpus yellow; femur long, with a longitudinal row of setae; tibia dilated with a dorsal-retrolateral apical projection, setose; cymbium short, almost spherical ( Figs. 7, 8 View Figure , 14–16 View Figure ). Abdomen ovoid ( Figs. 1, 2 View Figure ) 1.26 long, 0 70 wide, 0.70 high, dorsum cream with transversal parallel brown bands, sides cream, venter cream irregularly shaded with brown. Epigastric region light fulvous. Spinnerets light yellow. Tegument of dorsum covered with numerous white setae ( Figs. 11, 12 View Figure ), venter covered with long white setae.

Female (Paratype, MCTPAbout MCTP 17881). Total length 3.06. Carapace 1.14 long, 0.90 wide, 0.40 high, shape as in male. Color light fulvous stained with brown; the shading is darker than in the male, lateral margins brown ( Fig. 3 View Figure ). Clypeus 0.18 high. Eyes as in male. Eye diameters and interdistances: AME 0.06, ALE 0.10, PME 0.06, PLE 0.10, AME-AME 0.04, AME-ALE tangent, PME-PME 0.06, PME-PLE tangent. MOQ 0.14 long in dorsal view, anterior width 0.14, posterior width 0.20. Chelicerae 0.22 long, 0.12 wide, light yellowish with the anterior face coated with brown setae. Labium 0.26 long, 0.22 wide, light fulvous, densely coated with setae. Endites 0.44 long, 0.14 wide on the apical third, very convergent, densely coated with setae. Sternum 0.64 long, 0.60 wide, light fulvous, shaded with brown, setose ( Fig. 4 View Figure ). Legs: formula 1.4.2.3; general color as in male. Female pedipalpi with prominent claw ( Fig. 21 View Figure ). Femur of leg IV slightly dilated ( Fig. 19 View Figure ) with feathery setae ( Fig. 20 View Figure ). Leg measurements (length: femur, patella, tibia, metatarsus, tarsus, total): I: 1.20, 0.36, 1.16, 1.04, 0.70, 4.46; II: 0.84, 0.36, 0.66, 0.66, 0.48, 3.00; III: 0.72, 0.34, 0.50, 0.60, 0.40, 2.56; IV: 1.02, 0.36, 0.90, 0.86, 0.50, 3.64. Abdomen ovoid, 1.90 long, 1.20 wide, 1.20 high, dorsum whitish cream with the same parallel stripes as in the male. Sides whitish cream, ventral face cream shaded with brown. Epigastric region light fulvous, epigastric flap with a row of marginal feathery setae ( Fig. 6 View Figure ). Spermathecae rounded ( Fig. 5 View Figure ). Female cribellum conspicuous ( Figs. 23, 24 View Figure ). Spinnerets whitish yellow, tegument soft, with long bristles ( Figs. 25–30View FIGURES 19 – 26View FIGURES 27 – 30).

Variation. Males (n= 6). Total length 2.30 (2.00– 2.53). Carapace length 1.01 (0.88–1.04), width 0.77 (0.70–0.82), height 0.59 (0.52–0.62). Abdomen length 1.28 (1.10–1.44), width 0.74 (0.64–0.84), height 0.69 (0.62–0.76). Females (n= 6). Total length 3.00 (2.35–3.92). Carapace length 1.07 (0.92–1.34), width 0.84 (0.60–1.06), height 0.65 (0.46–0.80); abdomen length 1.92 (1.26–2.56), width 1.15 (0.82–1.60), height 0.92 (0.68–1.54).

Other material examined. BRAZIL: Rio Grande do Sul, Viamão, Parque Estadual de Itapuã, 2 Ƥ, 28.VIII. 2003, ( MCTPAbout MCTP 17.876), 3 3, 2 Ƥ, 17.XII. 2003, ( MCTPAbout MCTP 17.884), 1 3, 1 Ƥ, 02.XII. 2003, ( MCTPAbout MCTP 17.894), 1 3, 13.I. 2004, ( MCTPAbout MCTP 17.871), 5 3, 13.I. 2004, ( MCTPAbout MCTP 17.875), all collected by Ana Carla K. Ferreira.

Distribution. Known only from the type locality.

Ecological notes. During the study period 79 adult specimens of Pikelinia arenicola  sp. n. were collected (61 males and 18 females). Forty-one specimens were collected within the dune area, 10 in the forest and 28 in the ecotone ( Fig. 31 View Figure ). This apparent preference for arid environments has also been documented for other Pikelinia  species ( Ramírez & Grismado, 1997). Males were collected in almost every month of the year ( Fig. 32 View Figure ). Most males were collected between November 2003 and February 2004, coinciding with the end of the period of spring and summer ( Fig. 32 View Figure ). Twenty-four males, approximately 39 % of all collected males, were captured in January ( Fig. 32 View Figure ).

MCTP

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