Noun
nucleomorph (plural nucleomorphs)
English Wikipedia has an article on:nucleomorphWikipedia
(biology) A small vestigial eukaryotic nucleus found between the inner and outer pairs of membranes in certain plastids.
The endosymbiotic acquisition of a eukaryote cell is represented in the cryptophytes; where the remnant nucleus of the red algal symbiont (the nucleomorph ) is present between the two inner and two outer plastid membranes. Source: Internet
However, the cryptophyte is not an endosymbiont—only the chloroplast seems to have been taken, and the chloroplast has been stripped of its nucleomorph and outermost two membranes, leaving just a two-membraned chloroplast. Source: Internet
Their chloroplasts lack a nucleomorph, their thylakoids are in stacks of three, and they synthesize chrysolaminarin sugar, which they store completely outside of the chloroplast, in the cytoplasm of the haptophyte. Source: Internet