Sponges. Phylum: Porifera. Sponge Characteristics. Simplest animal Live in all oceans but prefer shallow tropical waters. Sessile Asymmetrical body plan Filter feeders – can filter several thousand liters a day. Sponge Anatomy. Osculum – water out Pores – water in
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1. Encrusting – Flat – found in turbulent waters
2. Tubular – Tall – found in calm waters
3. Boring – make holes in whatever they are attached to
4. Pecten – found on living shellfish