Neriene oxycera, 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 : 109

Neriene oxycera , new species

( Fig. 4 )

Type specimens. – Holotype: male, Van Hoa Village , Son Tay Province, Bavi District, Vietnam (142), 23 Dec.2000.

Diagnosis. – Male of Neriene oxycera , new species, can be distinguished by the shape of lamella characteristica and the simple terminal apophysis ( Figs. 4 C-F).

Description of male. – Total length: 2.90. Carapace: 1.37 long, 1.00 wide. Abdomen: 1.60 long, 0.90 wide. Carapace grayish brown, unmodified. Eyes ( Fig. 4A ) subequal. AER recurved, intervals between eyes of AER shorter than AMEd; PER straight, PME-PME about PMEd, PME-PLE longer; ALE and PLE juxtaposed. Chelicerae ( Fig. 4B ) brown, furnished with small warty granulations anterolaterally, stridulatory ridges absent, promargin of fang groove with two teeth, first much bigger than second, retromargin with two small teeth. Lengths of legs: I 8.90 (2.33+2.67+2.50+1.40), II 6.86 (1.73+2.03+2.00+1.10), III 4.00 (1.03+1.07+1.23+0.67), IV 5.66 (1.50+1.60+1.73+0.83). Each patella and tibia with two dorsal spines, Ti I-II additionally with one prolateral spine. Fe I-III with small dorsal spine, Fe IV without. Tm I: 0.14. Tm IV absent. Abdomen cylindriform, without tubercle, gray with whitish spots laterally and dorsally.

Male palp ( Figs. 4 C-E). Patella short, with long spine dorsally. Tibia almost as long as cymbium, with several long spines on lateral and ventral surfaces, and one prodorsal, two retrodorsal trichobothria. Paracymbium J-shaped, basal part plate-shaped with short hairs, distal arm narrow, curved, pointing forwards with cluster of thin hairs at tip. Pit-hook on distal part of suprategulum long, extending out of cymbium, bending laterally. Embolic division ( Fig. 4F ) more simple than that of most Neriene : Lamella characteristica with long, slender lateral projection and posterior projection pointing forward and backward respectively; short, blunt anterior projection and dorsal projection. Terminal apophysis short, twisted element with no more than half coil. Embolus covered by embolic membrane with thumb-like appendage apically, embolus proper blunt.

Female unknown.

Etymology. – The specific name comes from Latin oxycerus (sharp) and refers to the sharp lateral and posterior apophyses of lamella characteristica.

Remarks. – Although the embolic division of this new species is relatively simple, the pattern is reminiscent of the a Neriene male palp. The general morphology of male palp, particularly the shape of embolus, which is similar to that of N. emphana , may show some relationship between them. However, neither terminal sclerite nor transversal sclerite exist in this new species that suggest that it does not belong in the N. emphana group.

Distribution. – Known only from the type locality.

Figures

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.