Multiple choice

Which of the following sponges is/are the solitary, living sponges characterised by ptychocysts?

  1. Demosponge

  2. Hexactinellids

  3. Octocorallia

  4. Hexacorallia

  5. Cerianthids
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Cerianthids look very similar to sea anemones. They are solitary, living buried in soft sediments. Tube anemones live and can withdraw into tubesthat are made of a fibrous material, which in turn is made from secreted mucus and threads of nematocyst-like organelles known as ptychocysts.

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