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Updated: Jul 27, 2025

A Method for Microinjection of Patiria minata Zygotes
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DEVELOPMENT OF THE SEA-STAR, ASTERINA BATHERI GOTO.

Yasuo T Kano1, Miéko Komatsu1

  • 1Uozu Aquarium, Uozu, Toyama 937 and Department of Biology, Faculty of Science, Toyama University, Toyama 930, Japan.

Development, Growth & Differentiation
|June 7, 2023
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Summary
This summary is machine-generated.

This study details the direct development of the sea-star Asterina batheri Goto from egg to juvenile, observed via natural spawning and artificial fertilization. Key developmental stages and metamorphosis completion in 10 days are highlighted.

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Area of Science:

  • Marine Biology
  • Developmental Biology
  • Echinodermology

Background:

  • Asterina batheri Goto is a species of sea-star.
  • Understanding sea-star development is crucial for marine ecology.
  • Previous research on related species like Asterina coronata japonica provides context.

Purpose of the Study:

  • To document the complete developmental process of Asterina batheri Goto.
  • To observe development from egg to juvenile stages.
  • To compare the developmental pattern with closely related species.

Main Methods:

  • Natural spawning and artificial fertilization were employed.
  • Observation of developmental stages including eggs, blastula, and brachiolaria.
  • Monitoring of metamorphosis and juvenile characteristics.

Main Results:

  • The breeding season is estimated to be late summer.
  • Eggs are approximately 430 μm, developing via holoblastic radial cleavage.
  • Metamorphosis is completed in 10 days, resulting in pale brown juveniles (800 μm) with specific tube-feet and tentacle arrangements.
  • Development is direct, mirroring Asterina coronata japonica.

Conclusions:

  • Asterina batheri Goto exhibits direct development.
  • The developmental stages and timeline are clearly defined.
  • The species shows strong developmental similarities to Asterina coronata japonica.