Which of the following does NOT belong to the category of Porifera?

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Step-by-step explanation:

- Identify the groups: phylum $Porifera$ = sponges; examples include Sycon, Spongilla and Euplectella.
- Hydra is a freshwater sessile animal with tentacles and cnidocytes; it belongs to phylum $Cnidaria$, not $Porifera$.
- Therefore the only organism listed that does NOT belong to $Porifera$ is Hydra (item 1).

FINAL_ANSWER: a

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