Pseudodesmus sp. 2

Fig. 26

Material examined.

Vietnam • 1 female; Quang Binh Province, Bo Trach Dist., Son Doong cave, outside cave, back entrance; 17.48667 ° N, 106.28500 ° E; 16 Jan. 2023; A. D. Nguyen leg.; IEBR-Myr 987 .

Description.

Measurements: 55 body rings plus telson, length ca. 10.9 mm, midbody width 2.7 mm.

Quite convex body, almost cylindrical (without paraterga).

Collum bilobed, narrow, a little bit narrower than head, 2 pair of tubercles, posterior ones stronger.

Tergite tubercles on body rings 2–7 strong and wide, but from there onwards decreasingly inconspicuous, from 8 th backwards terga are clearly divided in anterior and posterior parts, also by coloration: light anterior part wider, light posterior part a bit narrower, tubercles disappearing, only weak transversal ridges appear. Telson, including para- and hypoproct dark brown. Coxal sacs on legs small, weak.

Color of ethanol-preserved specimens unique: dark thin median line, terga broadly light, almost white, base of all paraterga dark brown, edge of paraterga light yellow: in general looks like three longitudinal dark stripes, one thin median line and two wider parallel brown stripes. Head color is different: two white bumps (almost like large compound eyes), frontale and mandibulae dark brown, antennae dark brown.