Acerentominae Silvestri 1907

Subfamily Acerentominae Silvestri, 1907

This subfamily includes 11 genera (Szeptycki 2007; Bu & Yin 2011). In the fauna of eastern Russia four genera are present.

Tuxenentulus Imadaté, 1973 comprises 6 species, distributed in the Far East (Japan, China and Taiwan) and North America (Alaska, California) (Fig. 3). All species have been recorded only from their type localities, with the exception of T. ohbai Imadaté, 1973 reported from Japan (Honshu, Hokkaido) and northern China (Heilongjang). Tuxenentulus solncevae is known only from the type locality on Sakhalin Island in the Russian Far East (Shrubovych & Bernard 2013).

Sugaentulus Imadaté, 1978 comprises only 2 species, distributed in eastern Asia (Fig. 4). The type species, S. masumii, occurs in Japan and the other species, S. andrzeji, is widespread in northern and eastern Siberia (Shrubovych & Rusek 2012).

Filientomon Rusek, 1974 contains 10 species, distributed in eastern Asia (Russian Far East, Japan, China and Korea), Siberia and North America (Szeptycki 2007; Bu & Xie 2007) (Fig. 5). The two species collected from Russian Asia are known only from their type localities: F. sibiricum in southern Siberia (Szeptycki 1988) and F. duodecimsetosum in the Russian Far East (Nakamura 2004). Additionally, I have studied undetermined specimens of Filientomon from northern Siberia (Fig. 1, Site 1) and Sakhalin Island (Fig. 1, Site 7).

Yamatentomon Imadaté, 1964 consists of 5 species distributed exclusively in eastern Asia: Russian Far East, China, Japan and Korea (Szeptycki 2007; Bu & Wu 2012) (Fig. 6). The type species, Y. yamato, is described from Japan (Imadaté & Yosii 1956) and occurs in northern China (Bu & Wu 2012). This species is abundant in samples from Primorskyi Kray and Ussurijskyi Kray in the Russian Far East. Yamatentomon kunnephupi is known in both Japan and the Russian Far East (Imadaté 1964; Nakamura 2004).