Which synapomorphy of the plant clade is shared by coleochaetophytes (a group of green algae) and glaucophytes (the group most similar to the unicellular ancestor of Plantae)?

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Chloroplasts are a synapomorphy shared by coleochaetophytes and glaucophytes, as well as all other members of the plant clade. This organelle is crucial for photosynthesis and is a defining feature of plants and algae, indicating their common ancestry.

Which Synapomorphy of the Plant Clade Is Shared by Coleochaetophytes