Achieving a length of 33 feet is a survival milestone for this giant phantom species. The Stygiomedusa genus contains only 1 member, complicating efforts to define its deep-sea evolution.

In the dark and cold of the months-long polar night, food resources are limited. Some groups of marine organisms in the polar regions overcome this challenge by going into a metabolic resting state in ...

Jellyfish have an array of traits that differ between species such as a temporary anus. Read here to learn more about these jellies.

There are thousands of different species of sea anemones in the ocean with some living as far deep as 32,000 feet. Anemones are marine invertebrates that are closely related to jellyfish. This ...