I originally made a typo in the title, calling this a “deep-see” creature, but in fact that’s what it is! The video and info comes from IFL Science!, and shows a bizarre deep-sea species of siphonophore.
Siphonophores are in fact one form of what we normally called “jellyfish,” a group that actually comprises diverse creatures in the phylum Cnidaria. This form falls into the class Hydrozoa along with hydroids and colonial “jellyfish” like the Portuguese “Man O’ War” (Physalia physalis). Like the Man O’ War, this beast, spotted by a remote vehicle operating in the depths, is not really what we usually consider a “jellyfish,” as it’s colonial: the “individual” is really a colony of diverse and specialized individual cells (“zooids“) that have become integrated into a miniature cooperating society. Creatures like this stretch the notion of what biologists consider an “individual.”
At any rate, this siphonophore (if that’s what…
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