ClipArt ETC
A mass of coccoliths; a marine pelagic plant of low order covered with calcereous plates. A coccolithophore is a unicellular, eukaryotic phytoplankton (alga).

Coccolithophora

A mass of coccoliths; a marine pelagic plant of low order covered with calcereous plates. A coccolithophore…

When coccoliths are covered with rods, they are called rhabdoliths, and form a rhabdosphere.

Rhabdosphere

When coccoliths are covered with rods, they are called rhabdoliths, and form a rhabdosphere.