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The biostratigraphically important Permian radiolarian genera  Pseudoalbaillella  sensu stricto and  Follicucullus  (Follicucullidae, Polycystinea) are discriminated by morphological gaps in their wings and segmentation. Previous statistical analyses demonstrated that  Longtanella  fills morphological gaps between these two genera.  Longtanella  has long been regarded as a junior synonym of  Parafollicucullus , and only a few species have been described. Herein several true  Longtanella  species are recognized from South China, and eight new species and five indeterminate species are described and illustrated to prove the validity of the genus  Longtanella . In addition, a new genus,  Parafollicucullinoides  gen. nov., is described. Their palaeogeographic distributions and living environments are explored by applying correspondence analysis (CA), with occurrence datasets of selected fusulinacean genera from the Japanese Islands, China and Sundaland. CA results indicate that  Longtanella  was present to a limited extent in warmer conditions in the fusulinacean Province B and C during Kungurian–Roadian time, and possibly lived above the thermocline and below the deepest limit of fusulinaceans. The  Pseudoalbaillella  and the  Follicucullus  group preferred open ocean conditions, living below the thermocline and distributed not only in the ‘Equatorial Warm Water Province’, but also the northern peri-Gondwana Cool Water Province and the southern North Cool Water Province.

New Permian radiolarians from east Asia and the quantitative reconstruction of their evolutionary and ecological significances