The Silicofossil Group studies siliceous microfossils including diatoms, radiolarians, silicoflagellates, sponge spicules, ebridians, phytoliths, and some scolecodonts
The Palynology Group studies organic-walled palynomorphs that can be found in sedimentary archives, including acritarchs, to dinoflagellate cysts, pollen, spores and non-pollen palynomorphs
The Foraminifera Group represents the interests of all micropalaeontologists with research and applied interests in the foraminifera
The Ostracod Group represents the interests of all micropalaeontologists with research and applied interests in the ostracoda
The Nannofossil Group studies coccoliths and nannoliths, which are the calcareous remains of single-celled marine planktonic algae. They are typically 3-30um in size and range from the Triassic to Recent