Ilyocryptidae Smirnov, 1976

Family Ilyocryptidae Smirnov, 1976 View in CoL View at ENA

Ilyocryptus raridentatus Smirnov, 1989 View in CoL . Benthic species, found in Yingzhow Lake in November. I. raridentatus View in CoL is widely distributed in Australia and East Asia ( Malaysia, Thailand, Vietnam, East China, Japan and South Korea) and penetrates north to the Far East of Russia ( Dadykin et al., 2024). In China it was recorded only recently ( Dadykin et al. 2023), it was probably confused with other species of the genus by previous researchers.

Ilyocryptus spinifer Herrick, 1882 View in CoL . Benthic species found in November only, in Dazong Lake (N3) and in ponds near Tou Lake (N7, N8). The species is distributed worldwide, except the west Palearctic, it is very common in tropics and subtropics, and more rare in temperate regions ( Korovchinsky et al. 2021b). The species is common in East Asia, including China ( Kotov et al., 2024; Xiang et al. 2015).

Ilyocryptus yooni Jeong, Kotov & Lee, 2012 View in CoL . The species was found in March in open water plankton sample from Qili Lake. The sample was taken during a strong wind, and the water was very turbid. The species was not present in samples from macrophytes or open littoral, so we assume that it inhabits bottom sediments at a certain depth. The species is recorded from the Far East of Russia, Japan, Korea and North and East China and Vietnam ( Jeong et al., 2012; Kotov et al. 2024), Hainan Island (Sinev et al. 2015) and mountainous regions of Malaysian Borneo ( Sinev & Yusoff 2015).