What's the difference between adelocodonic and phanerocodonic?

Adelocodonic

Definition:

• (a.) Applied to sexual zooids of hydroids, that have a saclike form and do not become free; -- opposed to phanerocodonic.

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Phanerocodonic

Definition:

• (a.) Having an umbrella-shaped or bell-shaped body, with a wide, open cavity beneath; -- said of certain jellyfishes.

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