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Deep-sea jellies are as diverse as they are beautiful!

Steve Haddock and his collaborators study these animals because the many remarkable shapes, sizes, colors, and bioluminescence capabilities can help in understanding evolution in the deep-sea, the chemical processes involved in bioluminescence, predator-prey interactions, and biodiversity in the deep midwater.

This Solmissus jelly is probably its deep purple color because of it’s prey—in this case, another purple jelly!

This undescribed species of hydromedusa - Tetrorchis, shows pink pigmentation due to absorbance, and rainbow iridescence due to the thin-film effect of its tissue acting on white incident light from the ROV.

This undescribed physonect, called the galaxy siphonophore by Haddock and his collaborators, is one of the more spectacular of the deep-living species observed this week on the R/V Western Flyer. It is often found in this spiral shape, casting its many tentacles all around like a spider in its web.

(via: Monterey Bay Aquarium Research Institute)