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In this video on Coastal Waters, we highlight three species. Please learn as much as possible about them and discover for yourself why we think they are so amazing.

  • Jellyfish and Comb Jellies
  • Lobster
  • Sea pens


Jellyfish as they are often called are not related to comb jellies even though they superficially resemble each other. Instead, they belong to two different phyla, about as different as we are from insects.

Comb Jellies belong to the phylum Ctenophora. They do not have stinging cells but instead have coloblasts, which are more like small sticky balls.

Jellyfish belong to the phylum Cnidaria. They do have stinging cells called nematocysts that are used to paralyze prey quickly. If the toxin does not work quickly, the jellies run the risk of the prey ripping off their tentacles and damaging the rest of the organism.


Lobsters are Crustaceans, a type of invertebrate that is closely related to insects. Lobsters feed on detritus, dead organic material that they scavenge from the marine environment. Most temperate lobster have a pair of large chelae, appendages with snapping claws used to manipulate and cut up their food.


Here is some video of a temperate water lobster.


Sea Pens are not actually individual organisms, but a colony of individuals (making polyps) that live together as a commnity of organisms. They are in the phylum Cnidaria, in the same groping as corals, anohter organism that form colonies from a community of polyps.

Sea pens are found throughout the world's oceans, from the tropics to the temperate waters. Certain sea pens like the tall sea pen, which we filmmed here in Scandinavia, are only found in cold, deep waters.

Video soon to come from Explore Biodiversity.

Videos from Terra on Coastal Oceans


Information by Rob Nelson. Video from Google Video (various artists: click on the videos for more information)


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