Neriene cavaleriei ( Schenkel, 1963 )

Li, Lihong Tu Shuqiang, 2006, Three New And Four Newly Recorded Species Of Linyphiinae And Micronetinae Spiders (Araneae: Linyphiidae) From Northern Vietnam, Raffles Bulletin of Zoology 54 (1), pp. 103-117 : 107-109

Neriene cavaleriei ( Schenkel, 1963)

( Fig. 3 )

Linyphia cavaleriei Schenkel, 1963: 119 , Fig. 71.

Neriene cavaleriei van Helsdingen, 1969: 153 , Figs. 200-204.

Material examined. – 1 male and 1 female, Sac Ha Village , Cao Bang Province, Vietnam (075), 17 Dec.2000 ; 1 female, Sac Ha Village , Cao Bang Province, Vietnam (069), 17 Dec.2000 ; 1 female, Van Hoa Village , Sac Tay Province, Bavi Distr., Vietnam (128), 24 Dec.2000 .

Diagnosis. – The male N. cavaleriei can be recognized by the shape of paracymbium ( Fig. 3C ) and by the longer terminal apophysis that with more than five coils ( Fig. 3I ). The female can be distinguished by the bell-shaped epigynum with two rows of translucent areas ( Fig. 3J ) and vulva with five parallel spiral grooves ( Fig. 3K ).

Description of male. – Total length: 5.04. Carapace: 2.02 long, 1.51 wide. Abdomen: 3.15 long, 1.01 wide. Carapace brown; cephalic portion slightly elevated. PME biggest, situated on black tubercles, others subequal. AER recurved, AME-AME about AMEd, AME-ALE longer; PER slightly procurved, PME-PLE about PMEd, PME-PME longer; ALE and PLE juxtaposed. Chelicerae brown, stridulatory ridges absent, promargin of fang groove with six teeth, but the biggest one not on the same line with the other five small ones, retromargin with six teeth ( Fig. 3B ). Lengths of legs: I 12.10 (2.96+3.53+3.72+1.89), II 9.83 (2.58+2.84+2.96+1.45), III 6.74 (1.89+1.95+1.95+0.95), IV 9.51 (2.77+2.58+2.90+1.26). Each patella and tibia with two dorsal spines, Ti I-II additionally with one prolateral and one retrolateral spine, Ti III-IV with one prolateral spine. Fe I-IV with small dorsal spine. Tm I: 0.18. Tm IV absent. Abdomen cylindriform with conspicuous posterodorsal tubercle above spinnerets; dark gray with whitish spots laterally and dorsally, ventral surface uniformly black.

Male palp ( Figs. 3 C-E). Patella short, with long spine dorsally. Tibia wider than long with several long spines and one prodorsal, two retrodorsal trichobothria. Cymbium unmodified. Paracymbium somewhat J-shaped with short hairs on baslal part, distal arm well-developed with two free ends, one triangular pointing backwards, one more sharper, pointing forwards. Pit-hook on distal part of suprategulum as normal shape of Neriene hammeni group (van Helsdingen, 1969), L-shapped with hooked apex ( Fig. 3F ). Embolic division ( Fig. 3G ) prominently characters by large lamella characteristica in prolateral view, with slender and sharp posterior tip, blunt anterior tip, point tip at end of lateral projection and additional tooth-like projection on dorsal margin. Terminal apophysis conspicuously long with more than five coils ( Fig. 3I ), basal coil saucer-shaped, others with thin transversal grooves. Embolus visible at base of terminal apophysis covered by embolic membrane, with falciform appendage distally which sclerotized and serrated at basal part of anterior margin ( Fig. 3H ). Transversal sclerite somewhat rectangular, lying between lateral projection of lamella characteristica and base of terminal apophysis.

Description of female. – Total length: 5.29. Carapace: 2.02 long, 1.51 wide. Abdomen: 3.15 long, 1.01 wide. Lengths of legs: I 11.03 (2.90+3.34+3.15+1.64), II 8.95 (2.46+2.65+2.52+1.32), III 6.04 (1.76+1.76+1.70+0.82), IV 8.69 (2.58+2.46+2.52+1.13). Tm I: 0.20. Tm IV absent. Other somatic characters same as male.

Epigynum ( Fig. 3J ). In ventral view, ventral plate bell-shaped, with two rows of translucent areas. Posterior margin deeply concave in median and convex laterally. Scape arising from dorsal wall, turning up ventrally, with pit at tip. Vulva ( Fig. 3K ) as long as wide, fertilization grooves started from ventral wall, with five parallel coils, turning points laterally of apices, pointing inwards.

Distribution. – Vietnam (Cao Bang, Sac Tay), China.

Figures

Fig. 3. Neriene cavaleriei (Schenkel, 1963): A, female left chelicera, frontal view; B, male left chelicera, frontal view; C, male left palp, retrolateral view; D, ditto, ventral view; E, ditto, prolateral view; F, distal part of suprategulum; G, embolic division, ventral view; H, embolus, dorsal view; I, terminal apophysis, lateral view; J, epigynum, ventral view; K, vulva, dorsal view. Scale bars = 0.1 mm.