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Diagnostic features

Chlorophyte with spherical cells, each of which supports one or more spines. Each cell contains a single cup-shaped green chloroplast. Colonies of tightly packed cells may form spheres, squares, triangles or pyramids with many radiating spines. 

Typical habitats

Found in the plankton of nutrient-rich lakes and ponds. Often abundant in sewage ponds, particularly during spring and summer.


Kingdom Plantae
Phylum Chlorophyta
Class Chlorophyceae
Order Chlamydomonadales
Family Micractiniaceae
Common name Green algae