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Ciro Santilli (@cirosantilli, 36)

The simplest multicellular species

One of the simplest known seems to be: en.wikipedia.org/wiki/Trichoplax

www.u-tokyo.ac.jp/focus/en/articles/a_00220.html "The simplest multicellular organism unveiled" from 2013 mentions Tetrabaena socialis.

Then of course: Caenorhabditis elegans is a relatively simple and widely studied model organism.

Nicole King (UC Berkeley, HHMI) 1: The origin of animal multicellularity by iBiology (2015)

youtu.be/1v6cgSkiHik?t=513 multicellularity is polyphyletic, e.g. evolved separately on plants, fungi and animals.
youtu.be/1v6cgSkiHik?t=668 describes how unicellular organism choanoflagellates form colony, and how animals are characterized by certain key types of cellular interaction: adhesion, communication, regulation (cell differentiation) and extra cellular matrix production

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