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).