Many unusual creatures live in the oceans of the Earth, which people can see very rarely. Among them, huge jellyfish species Stygiomedusa gigantea stand out. These elusive deep-sea jellyfish have a 1 meter wide dome and four tentacles that can grow up to 10 meters. Thus, these creatures, which live in all the oceans of the Earth except the Arctic Ocean, are among the largest marine invertebrate predators in the world, writes Live Science.

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Scientists discovered the first specimen of a jellyfish of the species Stygiomedusa gigantea in 1899, and first described this creature only in 1910. Since then, huge jellyfish in the oceans of the Earth have seen only about 120 times. The fact is that these invertebrate predators usually live at a depth of 6700 meters.

Features of the bodies of these jellyfish, which can shrink, allow them to survive at incredibly high pressure at very great depths.

Three years ago, scientists first observed jellyfish of the species Stygiomedusa gigantea during expeditions to Antarctica. Scientists have discovered that these jellyfish swim at depths of 80 to 280 meters. Biologists suggested that in these latitudes, jellyfish can live much closer to the surface of the ocean, because seasonal changes in the level of sunlight can help move the jellyfish production closer to the surface of the ocean.

Unlike other jellyfish, Stygiomedusa gigantea does not have stinging tentacles to catch prey.. Instead, they wrap their tentacles around their food, usually plankton or small fish, and pull it into their mouths.. These huge jellyfish also differ from other jellyfish in that they are viviparous, meaning they give birth to live young.. They develop inside the mother before it emerges from her mouth.

The huge jellyfish produce a faint orange-red light through bioluminescence, meaning they create light through natural chemical reactions.. Scientists do not know exactly why Stygiomedusa gigantea jellyfish shines, but it is supposed to be associated with their communication with each other, and is also a way to scare away predators and attract prey or potential partners.

Since these jellyfish live very deeply, where sunlight almost does not penetrate, their glow is very weak, and therefore they remain elusive.

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