"You could see these repeated dark stains along each tentacle that resembles how comb jelly combs fossilize.
"We also realized that a fossil, Xianguangia, that we always thought was a sea anemone is actually part of the comb jelly branch," co-author Cong Peiyun, said in the statement.
It's possible that the comb jelly also evolved its nervous system after diverging from the common ancestor.
Caption: The comb jelly Mnemiopsis leidyi rests at the base of the tree of animal life, according to analyses of its genome.
Leidy's comb jelly eats the myriad tiny animals known collectively as zooplankton.
from The Leidy's comb jelly, a jellyfish native to the the Americas western Atlantic coast, devastated the Black Sea fisheries.
It's even possible that the sophisticated comb jelly lineage may have evolved before the brainless, gutless, muscle-less sea sponges.
Augustine, recently sequenced the genome of the sea gooseberry comb jelly, Pleurobracbia bachei.
This specimen from the Arctic is probably a new species of comb jelly
, (Unlike true jellyfish, in the phylum Cnidaria, comb jellies don't have stinging cells.) Census participants have lamented the current shortage of experts able to classify the vast numbers of organisms that have been pulled from the seas in the past decade.