Cybaeus vignai Brignoli, 1977

Isaia, Marco & Chiarle, Alberto, 2015, Taxonomic notes on Cybaeus vignai Brignoli, 1977 (Araneae, Cybaeidae) and Dysdera cribrata Simon, 1882 (Araneae, Dysderidae) from the Italian Maritime Alps, Zoosystema 37 (1), pp. 45-56 : 47

Cybaeus vignai Brignoli, 1977

( Figs 1 , 2 )

Cybaeus vignai Brignoli, 1977: 32 , fig. 11. — Isaia et al. (2011): 152, figs 2.93D, E; 2.94 (in part, female only; see C. intermedius ).

MATERIAL EXAMINED. — Italy. Piemonte ( CN), Natural Park of Maritime Alps: 1♂, beech forest, Palanfrè, Vernante, 1450 m, 11.VIII-09.IX.2011, leg. A. Chiarle & M. Stassi, pitfall traps (coll. MI); 2♂, 1♀, beech forest, Palanfrè, Vernante, 1500 m, 21.VII- 11.VIII.2011, leg. A. Chiarle & M. Stassi, pitfall traps (coll. MI); 7♂, beech forest, Palanfrè, Vernante, 1550 m, 21.VII-11.VIII.2011, leg. A. Chiarle & M. Stassi, pitfall traps (coll. MI); 8♂, 2♀, beech forest, Palanfrè, Vernante, 1600 m, 21.VII-11.VIII.2011, leg. A. Chiarle & M. Stassi, pitfall traps (coll. MI); 1♂, beech forest, Palanfrè, Vernante, 1500 m, 9.IX-13.X.2011, leg. A. Chiarle & M. Stassi, pitfall traps (coll. MI); 2♂, stream bank with Petasites in deciduous forest ( Fraxinus ), torrente Busset, Trinità di Entracque, 1000-1200 m, 28.VI-09.VIII.2007, leg. K. Wolf-Schwenninger & H. Schwenninger, pitfall traps (coll. MI); 2♀, cave, Grotta di Tetto Verna, Vernante, 25. VI.2006 and 30.VIII.2006, leg. E. Lana, hand collecting (coll. MI) [in Isaia et al. 2011].

DIAGNOSIS. — Males of C. vignai can be distinguished from those of other species of Cybaeus by the peculiar “curled” posterior portion of the tegular apophysis ( Fig. 1A [PA], 1C [PA]). The form of the tegular apophysis is considered species-specific ( Copley et al. 2009).

DESCRIPTION OF MALE ( FIG. 2 ) Measurements (n=1, from Palanfrè): carapace 2.63 long, 1.74 wide. Head region 1.05 wide; PER 0.52 wide. Labium 0.40 wide, 0.29 long. Sternum 1.12 long, 1.16 wide. Opisthosoma 2.23 long, 1.66 wide. Leg measurements as in Table 1.

Eyes In dorsal view both eye rows slightly recurved. Minimum and maximum diameters: PME: 0.056 -0.069; PLE: 0.058 -0.067 ; AME: 0.053 -0.063 ; ALE: 0.069 -0.074 .

Distances

PME–PME about three times their diameter; PME–AME one and half the diameter of PME; PME–PLE nearly twice the diameter of PME; PME–ALE about the diameter of PME or slightly less; AME–AME about twice their diameter; AME–ALE about half the diameter of ALE. Clypeus height (measured under AME) male: 0.23. Coloration:carapace yellowish to dark reddish. Legs yellowish to brown, coxae dorsally and ventrally lighter than the other segments. Sternum without coloration pattern. Opisthosoma pale yellow to greyish; cardiac mark not pronounced. Additional somatic characters: distal margin

of labium straight. Three teeth on promargin of cheliceral fang furrow. Four smaller teeth and three or four denticles on retromargin. Boss on retromargin of cheliceral base. All legs tarsi, metatarsi and tibiae with 8-10 dorsal trichobothria. No trichobothria on patellae, femora and palps. Formulae of leg spination as in Table 2.

Palp ( Figs 1 A-C)

Anterior retrolateral patellar apophysis (RPA) thumb-like, stout, almost long as the width of the patella, distally rounded. Many peg setae (more than 50) scattered on dorsal and lateral surfaces of patellar apophysis. Retrolateral tibial apophysis (RTA) in form of a process slightly produced anteriorly and extending posteriorly nearly for the entire length of tibia. Tegulum distally developed into a filiform embolus originating at almost 12 o’clock position, distal tip at around 4 o’clock position. Anterior portion of tegular apophysis (AA) distally broadly rounded, ending at approximately 2 o’clock position, laterally folded along whole length.

Figures

FIG. 1. — Cybaeus vignai Brignoli, 1977: A-C, male, from Palanfrè: A, bulb (ventral view); B, patella and tibia (dorsal view); C, bulb (retro lateral view); D, E, female, Grotta Tetto Verna (modified from Isaia et al. 2011): D, epigyne (ventral view); E, vulva (dorsal view). Abbreviations: see Material & methods. Scale bars: A, C, E, 0.5 mm; B, D, 0.2 mm.

FIG. 2. — Cybaeus vignai Brignoli,1977,male,from Palanfrè:A, dorsal view; B, prosoma with ocular region and chelicerae,frontal view.Scale bars:A,1 mm; B, 0.5 mm.