A new monotypic genus of cobweb spiders from the Russian Far East (Araneae, Theridiidae).

A new theridiid spider, Knoflachiakurilensisgen. et sp. nov., is described from the Kuril Islands (Kunashir). The new genus belongs to the 'Anelosimus clade (clade 24)' of Agnarsson (2004). A pair of raised, fused setal sockets on the cheliceral promargin adjacent to the fang base was found to be another synapomorphy of all the 'distal theridiids' (the 'elongated central claw clade (clade 33)': argyrodins, 'Anelosimus clade' and theridiins). Knoflachiakurilensissp. nov. demonstrates a male polymorphism similar to some Anelosimus Simon, 1891 species (e.g., A.studiosus (Hentz, 1850)).

Glebych minutissimus gen. et sp. nov., the smallest cobweb spider (Araneae: Theridiidae).

Glebych minutissimus gen. et sp. n., (♂♀), a minute six-eyed and apparently lungless theridiid spider, inhabiting epiphytes in foggy-forest belt at Peruvian Andes is described, representing the smallest (total length varies from 0.79 to 0.92 mm, carapace length ca. 0.36 mm) member of the family. Glebych gen. n. is related to the Neotropic genus Styposis Simon, 1894, which is small-sized and six-eyed as well.