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The below mentioned article provides a diagram of amphiblastula (larva).
1. It is a free swimming larval stage of Sycon and many other calcareous sponges.
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2. The body is some what ovoid in form and is comprised of an anterior half of small flagellated micromere cells and a posterior half of large non-flagellated macromere cells.
3. It encloses a small cavity the inside of which is filled with amoebocytes.
4. It develops from stomoblastula through a process of inversion.
5. It leads a free swimming existence for some times and then settles down at bottom and gives rise to young sponge through embolic gastrulation.
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6. The micromeres give rise to choanocytes lining radial canals and macromeres give rise to the rest of the layers.