A cyanelle is a photosynthetic organelle of glaucocystophyte algae. Cyanelles are surrounded by a double membrane and, in between, a peptidoglycan wall. Thylakoid membrane architecture and the presence of carboxysomes are cyanobacteria-like. Historically, the term cyanelle is derived from a classification as endosymbiotic cyanobacteria, and thus is not fully correct.
