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not one creature but a floating colony of clones too specialized to survive alone.

means A floating colony of stinging marine organisms (the Portuguese man o' war) whose gas-filled float and trailing tentacles look like a single jellyfish but are actually many cooperating polyps; the term also originally named a warship.

from From "man-of-war," an old English phrase for a heavily armed sailing warship — literally "man (i.e., person or vessel) of war." The Portuguese version, "caravela portuguesa," likened the creature's translucent crested float to such a ship under sail; English sailors borrowed the warship name, struck by how its long tentacles trailed beneath like rigging. So the animal is named after the vessel, not the reverse.

not jellyfish
It's a siphonophore, a colony of cooperating organisms.
sail power
Gas-filled float catches wind to drift across oceans.
tentacle reach
Stinging tentacles can trail 30 meters below.
sting after death
Beached tentacles still fire venom for days.
named for ships
Named after armed Portuguese warships under full sail.
for instance

portuguese man o' war — jellyfish-like marine animal found in atlantic and pacific oceans with venomous tentacles up to 165 feet long

hms man o' war — british naval ship that served in the caribbean from 1778-1784 during the american revolution

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