| Embryology of sea urchin: free-swimming pluteus larva |
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Legend:
1 mouth area
2 anal area
3 stomach in transparence
4 gut
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English name: Sea urchin
Scientific name: Psammechinus sp.
Familia: Echinidae
Classis: Echinoidea
Phylum: Echinodermata
Regnum: Animalia
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The definitive gastrula in sea urchins grows out to a so-called Pluteus- larva. This larva is primarily bilateral symmetrical. The radial symmetry in Echinodermatae is a secundary development.
To an overview of all early stages of sea urchin embryology.
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