bogleech:

It’s actually a jellyfish! With the terrifying name Stygiomedusa gigantea!

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the arms of the largest known specimen were almost 33 feet (10 meters) in length 🙂

The edge of the bell seems to reflect red light in these photos, or maybe it appears red because that’s the thinnest part of the bell and all of the tissues might technically be red, just so deep it looks blackish; red is invisible to most deep sea animals!