International Nannoplankton Association (INA): Semi-formal association of scientists worldwide who have an interest in living or fossil nannoplankton - including coccolithophores, nannoliths, and other nannofossils such as silicoflagellates and calcispheres.
International Research Group on Ostracoda (IRGO): An interdisciplinary, international organization of research scientists studying living and fossil Ostracoda.
The Micropalaeontological Society: Organization of micropaleontology workers in the UK. Formerly the British Micropalaeontological Society.
The Pander Society: An international association of palaeontologists and stratigraphers with a common interest in the study of conodonts.