Calcareous Nannofossils
- Information on these organisms including their fossil record, classification, biology and life cycle with a number of images of individual species.
- http://www.ucl.ac.uk/GeolSci/micropal/calcnanno.html

Coccolithophore
- Information from Wikipedia on these single-celled algae which form part of the phytoplankton.
- http://en.wikipedia.org/wiki/Coccolithophore

Haptophyte
- Information from Wikipedia on these single celled green algae which are some of the most abundant marine phytoplankton, especially in the open ocean and are plentiful as microfossils.
- http://en.wikipedia.org/wiki/Haptophyte