Benthic comb jelly

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The Benthic comb jelly is a jellyfish living in the Ryukyu Trench near Japan. Found at a depth of 7,217 metres (23,700 ft), it is the deepest dwelling ctenophore discovered.


The benthic comb jelly is a gelatinous organism 5–8 cm wide and 10–20 cm long. It can attach itself to the sea floor using two long filaments and has two retractable tentacles at the opposite end. Its appearance has been said to resemble a two-tailed box kite.[1]


The Benthic comb jelly was discovered off the coast of Japan at the Ryukyu Trench. It was observed by the remotely operated underwater vehicle Kaikō on a dive into the Ryukyu Trench in April 2002, but the video and images of this unique bottom dwelling ctenophore remained "undiscovered" until several years later.[when?] During April 2006, scientists from the Census of Marine Zooplankton observed a number of rare deep-sea ctenophores, which led to a re-examination of the cydippid ctenophore taxonomy and the suggestion that there be two new families of cydippid ctenophore. Due to several taxonomic affinities[vague], researchers considered this species for inclusion in the genus Aulacoctena. However, the two species did not match up, so a second category will be made.


Many questions have arisen about the availability of food for the benthic comb jelly. Previously, it was thought the abyssal depths of deep sea trenches, such as this one, could not support predators that actively hunt macroscopic food sources (as opposed to sessile predators, which do not hunt). This led some to believe that there is missing information about the area's ecosystem.


  1. ^ "Benthic Comb Jelly | World Ocean Observatory". Retrieved 2014-05-13.