The precursor of dinosteranes were dinoflagellate algae developed in the saline and brackish water environments.
在这些环境中发育的甲藻类是甲藻甾烷的先质物.
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ABSTRACT Non - marine dinoflagellate fossil of middle cretaceous is very rare in the world.
中白垩世 非 海相沟鞭藻化石在世界上极为罕见.
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