The researchers mapped the full genetic code of the Pacific sea gooseberry, the nickname for a comb jelly
species known as Pleurobrachia bachei.
There are about 80 kinds of comb jelly
in the world, and about 20 of them are found in Japan, according to Horita.
The team had sequenced the genome of the comb jelly species Mnemiopsis leidyi and compared it with genomes of sponges and dozens of other organisms.
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.
This is the pathogen: the Leidy's comb jelly (Mnemiopsis leidyi), a widespread species but nothing special.
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.
Steve Haddock remembers every detail about his first ocean encounter with a comb jelly.
It's not just their appearance that is wondrous: Slice a comb jelly embryo in two and you get two half-adults that can fertilize themselves to give birth to a perfectly whole offspring.
It's even possible that the sophisticated comb jelly lineage may have evolved before the brainless, gutless, muscle-less sea sponges.
Although this species of comb jelly
can grow nearly 10 centimeters long in Arctic waters, the researchers collected animals that were no more than 1.
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.