''Tetracoccus'' may refer to:
*
''Tetracoccus'' (bacterium), a genus of the Rhodobacteraceae
*
''Tetracoccus'' (plant), a plant genus under the family Picrodendraceae
*''Tetracoccus'', a genus of algae in the family Dictyosphaeriaceae, now called ''
Westella
''Westella'' is a genus of green algae in the family Scenedesmaceae
Scenedesmaceae is a family of green algae in the order Sphaeropleales. ''Scenedesmus'' algae are commonly found in freshwater plankton. The former family Coelastraceae is ...
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{{genus disambiguation