In some prokaryotes like cyanobacteria, there are membranous extensions into the cytoplasm which contain pigments. These structures are known as:

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In prokaryotes, the plasma membrane can form extensions into the cell. While typical bacteria have mesosomes, certain prokaryotes like cyanobacteria possess other specialized membranous extensions into the cytoplasm called chromatophores. Chromatophores contain pigments and are involved in photosynthesis. Mesosomes do not contain pigments. Inclusion bodies are non-membranous reserve material storage structures. Plasmids are small, circular, extrachromosomal DNA molecules. Answer: Chromatophores