Noun
endosymbiont (plural endosymbionts)
(ecology) An organism that lives within the body or cells of another organism.
Paulinella chromatophora is a freshwater amoeboid which has recently (evolutionarily speaking) taken on a cyanobacterium as an endosymbiont. Source: Internet
For example, in the initial stages of endosymbiosis, due to a lack of major gene transfer, the host cell had little to no control over the endosymbiont. Source: Internet
Chromatophores While most chloroplasts originate from that first set of endosymbiotic events, Paulinella chromatophora is an exception that acquired a photosynthetic cyanobacterial endosymbiont more recently. Source: Internet
It is important to note that the cyanobacterial endosymbiont already had a double membrane—the phagosomal vacuole -derived membrane was lost. Source: Internet
Early chromalveolates Recent research has suggested that the ancestor of the chromalveolates acquired a green algal prasinophyte endosymbiont. Source: Internet
Euglenophyte chloroplasts have three membranes—it is thought that the membrane of the primary endosymbiont was lost, leaving the cyanobacterial membranes, and the secondary host's phagosomal membrane. Source: Internet