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LARVAL DEVELOPMENT IN THE ASTEROID ECHINASTER ECHINOPHORUS.

David G Atwood

    The Biological Bulletin
    |April 4, 2017
    PubMed
    Summary
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    Fine structure of an elongated dorso-ventrally compressed echinoderm (holothuroidea) spermatozoon.

    Journal of morphology·2018
    See all related articles

    This study details the external development of Echinaster echinophorus sea star eggs, revealing rapid cleavage and unique larval arm formation. It provides a timeline for larval and juvenile growth, crucial for understanding sea star reproduction.

    Area of Science:

    • Marine Biology
    • Developmental Biology
    • Echinoderm Research

    Background:

    • Echinaster echinophorus sea stars spawn two egg types: pelagic and benthic.
    • This study focuses on the external morphogenesis of the benthic egg type.

    Purpose of the Study:

    • To describe the external morphogenesis of Echinaster echinophorus benthic eggs.
    • To document the chronology of larval and juvenile development.
    • To present growth rates of larvae and juveniles.

    Main Methods:

    • Observation of spawning and egg development in laboratory conditions.
    • Documentation of external morphological changes from fertilization to juvenile stages.
    • Measurement of larval and juvenile growth parameters (length, weight).

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    Main Results:

    • Rapid cleavage stages observed at 25°C, reaching gastrula within 24 hours.
    • A modified brachiolaria larva with four arms and a central sucker developed by 48 hours.
    • Unique preoral lobe folding reported at 7 days; detailed larval and juvenile growth rates presented.

    Conclusions:

    • The study provides a comprehensive account of Echinaster echinophorus benthic egg development.
    • The findings offer insights into sea star larval morphology and growth.
    • This research contributes to the developmental biology of echinoderms.