8. * Ilyocryptus thailandensis Kotov et Sanoamuang, 2004

Localities and specimens found: 62 − 1♀ ov, 1j; 67 − 13♀, 7♀ ov, 6♀ em, 9j.

Distribution and ecology. This is a rare species, perhaps an endemic to Southeast Asia. It was described from Thailand (Kotov & Sanoamuang 2004b), and later this species was also recorded in Laos (Kotov et al. 2013b). In Vietnam, I. thailandensis was recently discovered during the present studies of the bottom meiofauna (Gusakov et al. 2024; Kotov et al. 2024).

The species lifestyle and ecology are unstudied. Obviously, they are similar to those in other congeners. Hitherto, I. thailandensis has been found in a permanent pond, puddle and peat swamp (Kotov & Sanoamuang 2004b; Kotov & Štifter 2006; Choedchim & Maiphae 2023). In Vietnam, we registered it in two temporary water bodies: a small floodplain forest lake and a roadside pool (see Appendix 1). In the second habitat, the species was relatively abundant.