Rhabdosphaera clavigera
Rhabdosphaera (in green) forms long protrusions from the centre of the coccolith, and the precise architecture of these spines can be seen. A coccosphere of Emiliania huxleyi (in pink) can be seen in the background.

Details: Specimens from the Alboran Sea, western Mediterranean (R/V Hesperides cruise Mater II, station 69).
Filename: MG128-14 copy.jpg