What is the chief difference between the hydrozoans and the rest of the cnidarians regarding the germinal layer(s) in which its 'defensive structures or cells of defence' occur?
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Explanation:
These features distinguish hydrozoans from other cnidarians regarding germinal layers:
• Nematocysts are only in the epidermis
• Gametes are epidermal and released to the outside of the body rather than into the gastrovascular cavity
• And Mesoglea is largely a cellular.
• Medusa projects inward to form a Shellie lip, called the vellum. A vellum is present on most hydrozoan medusae but is absent in all other cnidarian classes.
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