Figs 78–79, 87

Type material. Holotype female, 6 female paratypes, VIETNAM: Hai Phong Province, Cat Ba National Park, Trung Trang Cave (N20°46.68', E106°58.35'), 16 July, 2008, Shuqiang LI, Guo ZHENG & Dinh-Sac PHAM leg.

Etymology. The species epithet is derived from the Latin ‘ parvi ’ and ‘ triangulus ’, referring to the small and triangular atrium in this new species; adjective.

Diagnosis. The new species is similar to N. pseudovietnamensis sp. nov. in having the small and triangular atrium, the large copulatory ducts, the small and anteriorly situated spermathecal heads (Figs 78A–B, 79B–C), but can be distinguished from the latter by the widely separated and elliptic copulatory ducts, the complex spemathecal stalks which are not entirely covered by copulatory ducts (Figs 78A–B, 79B–C).

Description. Female. Total length 4.50–5.10. Holotype total length 4.75, prosoma 2.25 long, 1.65 wide; opisthosoma 2.50 long, 1.60 wide. Eye measurements: AME 0.05; ALE 0.13; PME 0.11; PLE 0.13; AME– AME 0; AME–ALE 0; ALE–PLE 0; PME–PME 0.08; PME–PLE 0.04. Clypeus height 0.13. Leg formula: IV, I, II, III; leg measurements: I: 8.60 (2.25, 2.80, 2.20, 1.35); II: 7.35 (1.95, 2.45, 1.75, 1.20); III: 6.60 (1.85, 1.95, 1.80, 1.00); IV: 9.45 (2.45, 3.00, 2.70, 1.30). Chelicerae with three promarginal and two retromarginal teeth (Fig. 78C). Epigynal teeth absent (Figs 78A, 79B); atrium small, triangular, with a tongue-shaped posterior extension (Figs 78A, 79B); copulatory ducts elliptic, covering the most of spermathecae (Figs 784B, 79C); spermathecae large, rounded, widely separated (Figs 78B, 79C); spermathecal heads small, extended anteriorly, with distinct stalks (Figs 78B, 79C).

Male. Unknown.

Habitat preferences. These specimens were collected in cave, this species may live in the caves or the rock crevices.

Distribution. Vietnam (Hai Phong) (Fig. 87).