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Propelled by eight rows of combs, sea gooseberries deploy
long tentacles to fish for small crustaceans.
At first sight pleurobrachia may look like a Chinese lantern, a christmas decoration or a flashing sign. A strange animal, commonly called ‘sea gooseberry’ or cat’s eye Pleurobrachia, which means arm at the side, is about the size of a marble. Pleurobrachia belongs to the family of ctenophores, from the Greek word ‘ktenos’, a comb. Their iridescent combs are made up of thousands of cilia which are used for propulsion.
Pleurobrachia are carnivorous. They capture zooplankton using long tentacles armed with sticky cells - called colloblasts - and then pull them towards their mouth.
Ctenophores are amongst the most ancient animals known to have developed a neuro-sensorial system. By studying them, biologists hope to learn how the first neurons appeared, information vital to an understanding of our own brain cells.
In this episode
/ Beroe ovata
/ Leucothea multicornis