The Micropalaeontological Society - Organization of micropaleontology workers in the UK. Formerly the British Micropalaeontological Society. - http://www.nhm.ac.uk/hosted_sites/tms/
The Pander Society - An international association of palaeontologists and stratigraphers with a common interest in the study of conodonts. - http://www.le.ac.uk/geology/map2/pander/index.html
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. - http://www.nhm.ac.uk/hosted_sites/ina/