There are no two- three- or four-, five-, six-, etc.-celled organisms.
Two celled.
Desmidoideae is a class of conjugating green algae, phylum Gamophyta. Most desmids form pairs of cells whose cytoplasms are joined at an isthmus (Margulis and Schwartz 1982, 100). The bacterium Neisseria also tends to form two-celled arrangements. As noted above, this may not be relevant to the evolution of multicellularity.
CB922: Intermediate two-celled life
Two to thirty-two celled.
The photosynthetic flagellate Gonium is a colonial intermediate between the free-living Chlamydomonas and the hollow ball-like colonies of Volvox, in that Gonium is a simple cluster of 2 to 32 Chlamydomonas-like cells embedded in a wad of gelatinous polysaccharides.
Bonner, John Tyler, 2000. First Signals: The evolution of Multicellular Development, Princeton University Press.
Edited by molbiogirl, : No reason given.
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