noun, singular: blue-green alga
The former name for a group of prokaryotes characterized by having the following general features:
- primarily photosynthetic, i.e. chlorophyll on intracytoplasmic membranes are present and involved in photosynthesis
- blue-green in colour due to the presence of phycobiliproteins.
- occurring singly (unicellular) or in colonies (filamentous, e.g. Anabaena sp.)
- heterocysts capable of nitrogen fixation
- nonmotile or by gliding motility
- reproduce by binary fission
The blue-green algae are named as such because of the blue green colour of their cells due to the presence of phycobiliproteins.
Also called: blue-green bacteria or cyanobacteria.