__________ were an important planktonic algal group that appeared during earliest Jurassic.

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Coccolithophores were an important planktonic algal group that appeared during the earliest Jurassic, around 200 million years ago. They are single-celled organisms that produce tiny calcium carbonate plates called coccoliths, which contribute to marine sedimentation and play a role in global carbon cycling. Dinoflagellates also appeared during this time, but they were already present in the Late Triassic period. Belemnoids and conodonts are not algal groups, but rather extinct marine animals that lived during the Mesozoic era.

__________ Were an Important Planktonic Algal Group That Appeared During