According toEncyclopedia Britannica, the Volvoxgenus contains about 20 different species (2015). These autotrophic green algaelive in fresh water where they form “spherical or oval hollow colonies” (2015).These colonies can range from 500 to 60,000 cells joined together via cytoplasmicfilaments (2015). Their somatic cells each have two flagella and one chloroplast(2015).
These microorganisms engage in “phototaxis” by grouping the colony memberswith larger “light reception” areas together to form an area specifically targetedfor photosynthesis (2015). Most Volvoxspecies reproduce asexually and sexually with some switching “primary modes ofreproduction” (2015).