Source of content: general zoology lab guide.

Operation method

Early embryonic development of animals and experiments on coelom observation

Principle

1. understand the general process of early embryonic development in multicellular animals by observing the various periods of early embryonic development in frogs and starfish, thus deepening our understanding of the origin of multicellular animals. 2. understand the main features of the Coelenterata phylum by observing slices of Hydra and immersion specimens of Serpentina, Lunar Hydroid, Jellyfish, and Anemone. 3. understand the importance of the development of the coelenterata phylum by observing the development of the early embryo in the frog and sea star.

Materials and Instruments

Starfish oval mounts Longitudinal and transverse sections Immersion specimens
Microscope Slides Coverslips

Move

1. Observations on the embryonic development of starfish (or sea urchins) and frogs at various periods.
2. observation of longitudinal and transverse sections of hydroids to characterize their internal structure.
3. observation of immersed specimens of Serpulidia, Luna, Jellyfish, Sea anemone.
4. demonstration: observation of sections of perispermathecial ovaries and ovaries of Hydra.

Common Problems

I. Homework:

1. draw a structural diagram of a transverse section of a frog protozoan embryo.

2. Draw the structure of a longitudinal section of Hydra.

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