Prosoponoides sinensis ( Chen, 1991 ) Li, 2006

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 : 113-117

Prosoponoides sinensis ( Chen, 1991) , new combination

( Fig. 9 )

Neriene sinensis Chen, 1991: 164 , Figs. 2 A-D.

Material examined. – 1 male and 1 female, Tan Linh Village , Son Tay Province, Vietnam (131), 23 Dec. 2000 .

Additional Material examined. – 1 male ( MHNG), holotype of Prosoponoides hamatus Millidge & Russell-Smith, 1992 , Ketambe, Gunung Leuser, northern Sumatro , coll. C. Deeleman, 3 May.1976 ; 1 female ( MHNG), holotype of Prosoponoides kaharianum Millidge & Russell-Smith, 1992 , Swampy primary forest, kaharian, Central Kalimantan , coll. C. Deeleman, 2 Sep.1985 ; 1 male ( MHNG), holotype of Prosoponoides simile Millidge & Russell-Smith, 1992 , Khao Yao National Park , Thailand, coll. C. Deeleman, 22 Dec.1988 .

Diagnosis. – The male of Prosoponoides sinensis can be recognized by the large lateral projection of lamella characteristica ( Figs. 9 B-E); the female by the epigynum with a septum that divides atrium into two compartments ( Fig. 9F ).

Description of male. – Total length: 2.70. Carapace: 1.50 long, 1.00 wide. Abdomen: 1.53 long, 1.00 wide. Carapace yellowish brown, unmodified. Eyes with black surroundings; AME smallest, others subequal; AER recurved, AME-ALE about AMEd, AME-AME shorter; PER straight, eyes separated by about PMEd; ALE and PLE juxtaposed. Chelicerae brown; stridulatory ridges absent; fang groove with three promarginal, two retromarginal teeth ( Fig. 9A ). Lengths of legs: I 5.90 (1.67+1.80+1.60+0.83), II 5.23 (1.50+1.60+1.40+0.73), III 3.03 (0.83+0.90+0.80+0.50), IV 3.94 (1.20+1.27+1.20+0.67). Each patella and tibia with two dorsal spines; Ti I-II additionally with one prolateral, one retrolateral spine. Fe I-IV with one small spine dorsally. Tm I: 0.21. Tm IV absent. Abdomen oval shape, dorsal surface pale white with black longitudinal spot on median line from which send out several short transversal spots, last one third part black, ventral surface uniformly dark gray.

Male palp ( Figs. 9 B-D). Patella short. Tibia wider than long, with one prodorsal, one retrodorsal trichobothrium. Cymbium unmodified. Paracymbium polliwog-shaped, main body stout, strongly sclerotized with short hairs, distal “tail” part narrow and thin, hardly visible. Large pit-hook on distal part of suprategulum well developed, with tip bifurcated in ventral view. Embolic division ( Fig. 9E ) characters by well-developed lamella characteristica with lateral projection wide and flat, bending dorsally, sharp apex pointing forwards, anterior and two dorsal projections blunt, triangular posterior projection pointing backwards. Terminal apophysis with two free ends, anterior one long, narrow, ribbon-like, posterior one sclerotized. Embolus long, more than half circle, arising from inside of radix, tracing out of cymbium through rolled embolic membrane.

Description of female. – Total length: 3.20. Carapace: 1.30 long, 1.10 wide. Abdomen: 2.0 long, 1.50 wide. Lengths of legs: I 5.90 (1.60+1.83+1.60+0.87), II 5.17 (1.50+1.67+1.40+0.60), III 3.23 (0.90+1.00+83+0.50), IV 4.74 (1.27+1.40+1.37+0.70). Tm I: 0.26. Tm IV absent. Other somatic characters same as male.

Epigynum ( Fig. 9F ). Two openings of entrance grooves with curved, well sclerotized margins. Atrium formed by enlarged openings with septum, which divides atrium into two. Triangular scape extending from dorsal wall of atrium, strongly sclerotized with big pit, slightly turning upwards in lateral view. Vulva ( Figs. 9 G-H) as long as wide, entrance grooves started from ventral wall, with two and half coils, turning points laterally of apices, pointing inwards.

Remarks. – Compared with the illustrations of Neriene clathrata (Sundevall, 1830) provided by van Helsdingen (1969: Figs. 83-91), the genital structures of present species show several differences: 1) without the coil-shaped terminal apophysis which is typical character of male palp of Neriene ; 2) embolus long, thread like; 3) epigynum with posterior margin of ventral wall extending in the middle to form a septum which divides atrium into two. These characters do not corresponding well with the genital type of Neriene , but show striking resemblance to that of Prosoponoides hamatum Millidge & Russell-Smith (1992: Figs. 1-4 , 8 -11). As a result, N. sinensis was transferred to Prosoponoides here in this study.

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

Figures

Fig. 9. Prosoponoides sinensis (Chen, 1991): A, left chelicera, frontal view; B, left male palp, retrolateral view; C, ditto, ventral view; D, ditto, prolateral view; E, embolic division, ventral view; F, epigynum, ventral view; G, vulva, dorsal view; H, ditto, ventral view. Scale bars = 0.1 mm.

Fig. 2. Microbathyphantes aokii (Saito, 1982): A, left chelicera, frontal view; B, left male palp, retrolateral view; C, ditto, prolateral view; D, embolic division, ventral view; E, epigynum, ventral view; F, ditto, lateral view; G, vulva, dorsal view. Scale bars = 0.1 mm.

Fig. 1. Bathyphantes floralis, new species: A, left chelicera, frontal view; B, left male palp, retrolateral view; C, ditto, prolateral view; D, embolic division, ventral view; E, lamella characteristca, prolateral view; F, embolic membrane, retrolateral view; G, ditto, prolateral view; H, epigynum, ventral view; I, ditto, lateral view; J, vulva, dorsal view. Scale bars = 0.05 mm.

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.

Fig. 4. Neriene oxycera, new species: A, ocular area of male, dorsal view; B, male left chelicera, frontal view; C, left male palp, retrolateral view; D, ditto, ventral view; E, ditto, prolateral view; F, embolic division, ventral view. Scale bars = 0.1 mm.

Fig. 8. Parameioneta bilobata Li & Zhu, 1993: A, embolic division (removing embolus), ventral view; B, embolus, ventral view; C, ditto, ventrolateral view. Scale bars = 0.1 mm.