Singaporemma adjacens Lehtinen, 1981

Yan, Fanhu & Lin, Yucheng, 2018, A review of the spider genus Singaporemma (Araneae: Tetrablemmidae), with the description of a new species, Zootaxa 4392 (2), pp. 329-346 : 331

Singaporemma adjacens Lehtinen, 1981

Figures 6H–h , 7A (cited from Lehtinen, 1980: fig. 47, slightly modified)

Singaporemma adjacens Lehtinen, 1981: 31 , figs 47, 51, 64. S. adjacens Lin et al., 2017: 51 , fig. 23F.

Examined material. Holotype ♂ ( ZMUT), VIETNAM: Quang Ninh, Ha Long , in litter of dense jungle close to seashore, altitude 10 m, 12 October 1978, P.T. Lehtinen leg, examined and photographed by Seppo K.

Diagnosis. Male of this species is distinguished from S. wulongensis and S. bifurcata by the lack of a furcate tip in embolus, but present in the latter two ( Fig. 6H, 6h vs. Fig. 6E–F, 6e–f ), and from the rest of congeners by the wider, belt-shaped embolus, but narrower, tubular in the rest ( Fig. 6H, 6h vs. Fig. 6A–D, 6G, 6a–d, 6g ). Female differs from females of other Singaporemma specie by the shorter, smaller central process ( Fig. 7A vs. Figs 2E , 5D , 7B ), and the lack of inner vulval plate and anterior ventrolateral plate ( Fig. 7A vs. Figs 7C , 8A–B , 9A–B ).

Description. See Lehtinen, 1981: 31.

Remark. We have no chance to examine the type material of S. adjacens from Vietnam for this study. Dr. Seppo Koponen (University of Turku, Finland) helped us to reexamine the holotype of this species and photographed its left palp. This species shows an egg-shaped bulb, a unique character within the genus Singaporemma . Unfortunately, we also had no chance to check the female specimens, so we can only cite Lehtinen’s illustration of this species ( Fig. 7A as modified from Lehtinen, 1981: 109, fig. 47).

Distribution. Vietnam ( Fig. 10 ).

Figures

FIGURE 2. Singaporemma bifurcata Lin & Li, 2010 A, male left palp, prolateral; B, ditto, retrolateral; C, female opisthosoma, ventral; D, genital area, ventral; E, genital area (lactic acid-treated), ventral. Scale bars: 0.20.

FIGURE 5. Singaporemma takensis sp. n. female paratype. A, opisthosoma, ventral; B, genital area, ventral; C, genital area (lactic acid-treated), ventral; D, vulva (lactic acid-treated), dorsal. Scale bars: 0.20 for A–B, 0.10 for C–D.

FIGURE 6. Singaporemma spp. male left palp (A–H) and embolic tips (a–h). A–a, S. halongense (paratype); B–b, S. banxiaoensis (holotype); C–c, S. singulare (holotype); D–d, S. lenachanae (paratype); E–e, S. wulongensis (holotype); F–f, S. bifurcata (topotype); G–g, S. takensis sp. n. (holotype); H–h, S. adjacens (holotype, photographed by Dr. Seppo Koponen). A– G, a–g, prolateral; H, h, retrolateral. Scale bars: 0.10 for A–H, 0.05 for a–h.

FIGURE 7. Singaporemma spp. female genital area and cleared vulva (A–C). A, S. adjacens B, S. halongense C, S. banxiaoensis (paratype); A–B, ventral (cited from Lehtinen, 1981, slightly modified); C, dorsal. Scale bars: 0.10.

FIGURE 8. Singaporemma spp. female genital area and cleared vulva (A–B). A, S. bifurcata (topotype); B, S. wulongensis (paratype); A–B, ventral. Scale bars: 0.10.

FIGURE 9. Singaporemma spp. female genital area and cleared vulva (A–B). A, S. singulare (specimen from type locality); B, S. lenachanae (paratype); A–B, ventral. Scale bars: 0.10.

FIGURE 10. Distribution records of Singaporemma spp. in the world. White balloon—S. adjacens; Blue balloon—S. banxiaoensis; Red-black circle—S. bifurcata; Red round—S. halongense; Red triangle—S. lenachanae; Red balloon—S. singulare; Red-black concentric circle—S. takensis sp. n.; Yellow square—S. wulongensis.