Cnidarian

Helmet jellyfish

Periphylla periphylla

PacificAtlanticIndianSouthernArctic Found in 4 oceans

Deep waters of all oceans, as far as Antarctic waters; very common in Norwegian fjords

Depth

Mostly below 500 m, down to 7,000 m

Size

Bell about 20 cm, up to 35 cm

Diet

Crustaceans, small fish

Zone

Midnight zone · 1,000 m and deeper

Key facts

• Its dark red color makes it invisible: red light does not penetrate to the depths.
• It avoids light, which destroys its pigments.
• When disturbed, it produces flashes of blue light.

And the sperm whale?

Minor danger: it stings.

Verified sources

1. X-Ray Mag - Periphylla, aliens of the deep
2. Wikipedia - Helmet jellyfish
3. SeaLifeBase, Periphylla periphylla

In the game: Mild danger: stings

In the same zone

Atolla jellyfishAtolla wyvillei FangtoothAnoplogaster cornuta Stoplight loosejawMalacosteus niger Pelican eelEurypharynx pelecanoides Humpback anglerfishMelanocetus johnsonii Greenland sharkSomniosus microcephalus