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    Area of Science:

    • Marine Biology
    • Developmental Biology
    • Echinodermata

    Background:

    • Asteroid echinoderm larval forms and developmental patterns show increasing diversity.
    • Previous classification attempts were ambiguous due to undefined character states.
    • Understanding evolutionary changes in development has been hindered by inconsistent definitions.

    Purpose of the Study:

    • To propose a multifactor classification for asteroid developmental patterns.
    • To define explicit ecological and developmental character states.
    • To clarify inconsistent terminology regarding development (e.g., larva, metamorphosis, indirect/direct development).

    Main Methods:

    • Utilizing explicit characters for habitat (pelagic/benthic) and nutrition (feeding/nonfeeding).
    • Categorizing morphological development as indirect (larval) or direct (nonlarval).
    • Revising definitions to account for continuous development and ontogenetic diversification.

    Main Results:

    • Direct development is exceptionally rare in asteroids, with indirect development being the norm.
    • All studied asteroids, except Pteraster tesselatus, exhibit indirect development.
    • The ancestral asteroid life cycle likely involved pelagic larval development with bipinnarian and brachiolarian stages.

    Conclusions:

    • The proposed classification provides a clear conceptual basis for analyzing asteroid life cycle evolution.
    • Six types of evolutionary transitions are hypothesized to explain developmental pattern diversity.
    • Consistent definitions are crucial for advancing research on echinoderm evolutionary developmental biology.