Related Experiment Videos
Embryogenesis in hydra
V J Martin1, C L Littlefield, W E Archer
1Department of Biological Sciences, University of Notre Dame, Indiana 46556, USA.
The Biological Bulletin
|June 1, 1997
Summary
Hydra embryogenesis, previously poorly understood in later stages, is detailed here. Key events include cell differentiation and gastric cavity formation within a protective cuticle before hatching.
Area of Science:
- Developmental Biology
- Animal Development
- Cell Biology
Background:
- Embryogenesis in hydra involves a dormant phase within a thick cuticle, obscuring middle and later developmental stages.
- Previous understanding of hydra embryogenesis was limited to early qualitative descriptions.
Purpose of the Study:
- To provide a detailed description of hydra embryogenesis stages.
- To quantify the time required for each developmental stage.
- To characterize cellular changes throughout embryogenesis.
Main Methods:
- Observation and characterization of embryonic development stages.
- Cell type and number analysis during embryogenesis.
- Analysis of cuticle formation and its role in development.
Main Results:
- Cleavage and gastrulation occur within 48 hours, forming a coeloblastula.
- Dormancy (2-24 weeks) involves ectoderm formation and interstitial cell lineage appearance.
- Endoderm and gastric cavity form in the final 2 days, with stem cell differentiation.
Conclusions:
- Hydra embryogenesis is characterized by distinct stages, including a prolonged dormancy.
- Gastric cavity formation and hatching are driven by osmotic and hydrostatic forces.
- Developmental events in hydra share characteristics with triploblastic phyla.