Yes
Coelenterata is an obsolete term encompassing two animal phyla, the Ctenophora (comb jellies) and the Cnidaria (coral animals, true jellies, sea anemones, sea pens, and their allies).
Sea pens are marine cnidarians that have a soft cylindrical body with a feathery, brightly colored polyp at one end. They are named for their resemblance to old-fashioned quill pens. Sea pens are typically found in deep-sea environments and are filter feeders, using their polyps to capture plankton from the water.
Cnidarians are jellyfish, sea anemones, sea pens, hydras (cnidarian="nettle" in latin, so they have stinging cells). They eat aquatic animals, from protozoa to fish.
Jellyfish, Coral, sea anemones, sea pens
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Turtles eat sea pens
Ryan James mildren
Both animals and prisoners were held in underground pens.
Marine Worms,Sea Pens and Sea Urchins
Yes, sea pens are invertebrates. They belong to the phylum Cnidaria and are closely related to corals and jellyfish. Sea pens are colonial organisms, typically found in shallow ocean waters, and have a structure that resembles a quill pen, which is where they get their name. They are anchored to the seabed by a root-like structure and can retract into their protective casing when disturbed.
they eat plankton and organic organisms
Wax tablets