A new species of Isotomidae (Collembola) was collected from submerged stones on the edge of nine lakes on Tasmania's Central Highland Plateau. Because it did not comply fully with the characters of any existing genus, a new genus, Chionobora gen. n. is erected for it here. An Antarctic species, Desoria klovstadi (Carpenter), has characters which conform with the new genus so is formally transferred to the new genus here. The Antarctic Continent and Tasmania were last in proximity 60 million years b.p. so it is suggested both species are relicts persisting in probable ice-free refugia during glacial cycles. Gut contents of specimens of the new species exclusively contained diatoms in various stages of digestion and the species appears to graze on aquatic macrophytes, a feeding habit not recorded before for Collembola. We note the high numbers of endemic invertebrate taxa of restricted distributions in cold habitats of southern regions compared to warmer regions and stress their conservation values and threats to their populations.
A taxonomic revision of the genus Subisotoma Stach, 1947 is presented. Subisotoma pusilla (Schaffer, 1900), S. tenuis (Dunger, 1982), and S. asiatica (Martynova, 1970) are re-described based on type and fresh material. Eight new species of the genus are described; S. pomorskii sp. nov., S. homonomica sp. nov., S. bisensillata sp. nov., S. guzeriplica sp. nov., S. posteriomollis sp. nov., S. multisensillata sp. nov., S. cruda sp. nov., and S. erratica sp. nov., using material from Eurasia. A key to the known species of Subisotoma is given. A new genus, Isotopenola gen. nov., is erected for some southern representatives of the 'Cryptopygus' complex related to Subisotoma: I. australis (Womersley, 1934) comb. nov., I. loftyensis (Womersley, 1934) comb. nov., I. nilgiris (Denis, 1947) comb. nov. They are re-described based on type and fresh material. A new species I. delicata sp. nov. is described from Australia. A key to the known species of Isotopenola is given.