Helmet jellyfish (Periphylla periphylla) is a luminescent, red-colored jellyfish of the deep sea. Trondheimsfjord, Norway, Atlantic Ocean

periphylla periphylla carybdea periphylla periphylla dodecabostrycha periphylla dodecabostrycha hyacinthata periphylla hyacinthata periphylla regina fjord autumn adult alone profile shot overview underwater shot red temperate sea bioluminescence october trondelag fylke norwegian sea black background abyssal scyphomedusa periphylla periphylla periphylla nobody fjords fiord fiords fall season adults single lonely only solo one lone profile sights profile sight profile shots profile view profile views side view overviews global sight global sights full length subaquatic photos subaquatic sights seen under the water photos under the water underwater shots subaquatic image underwater view submarine images submarine sights submarine sight submarine photos submarine photo underwater views submarine photographies submarine photography underwater underwaterphoto underwaterpicture underwaterphotography underwaterphotographies underwaterphotos underwaterpictures reds carmine magenta carmines magentas temperate seas temperate ocean temperate oceans bioluminescences bioluminescent bioluminescents black backgrounds helmet jellyfish with nobody landform earth's crust temperate season seasons atmosphere stage of development individual enumeration shot colour sea marine area area behavior trondelag landsdel norway scandinavia european union europe north atlantic ocean atlantic ocean world sea and ocean jellyfish cnidaria wild animal animal periphyllidae coronatae scyphozoa medusozoa cnidaria radiata metazoa opisthokonta eukaryota