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On dinoflagellate evolution

F J Taylor

    Bio Systems
    |January 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    This study explores dinoflagellate diversity and evolution, proposing new classifications and highlighting unique features like their complex eyes. It examines cyst roles and evolutionary history, affirming the primitive nature of desmokonts.

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    Area of Science:

    • Marine Biology
    • Evolutionary Biology
    • Protistology

    Background:

    • Dinoflagellates represent a diverse group of eukaryotic microorganisms with significant ecological roles.
    • Understanding their evolutionary history is crucial for comprehending early eukaryotic diversification.

    Observation:

    • The study categorizes dinoflagellates into five organizational types: prorocentroid, dinophysoid, gonyaulacoid, peridinioid, and gymnodinoid.
    • Ultrastructural and physiological data are integrated to infer evolutionary developments within these lineages.
    • Special attention is given to the nucleus and ocelli, noting the remarkable parallelism between dinoflagellate ocelli and metazoan eyes.

    Findings:

    • A model for thecal evolution is presented to determine plate homologies in gonyaulacoids and peridinioids.

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  • The roles of various cyst types in the dinoflagellate life cycle are discussed.
  • The study proposes a new combination, Plectodinium miniatum, and recognizes a new order, Gonyaulacales.

    • Implications:

    • The proposed evolutionary framework is evaluated for compatibility with the fossil record.
    • The findings contribute to understanding the phyletic position of dinoflagellates within the broader tree of life.
    • The relative primitiveness of desmokonts is affirmed, refining phylogenetic interpretations.