Katherine Wallis/ Shutterstock There are some 3,600 species of hydrozoans. These are typically smaller than scyphozoan jellyfish. The polyp stage of their lives is usually more conspicuous than the ...

It then settles on the seafloor as a blob-like cyst. Over the next 24-36 hours, this blob develops into a new polyp - the jellyfish's previous life stage - and after maturing, medusae bud off. This ...

Studying comb jellies made sense to scientists given the existence of Turritopsis dohrnii, also known, ironically, as the ...

When the jellyfish is damaged or stressed, it shrinks in on itself, reabsorbs its tentacles, and settles on the seafloor as a cyst ...

And one hydrozoan, the immortal jellyfish (Turritopsis dohrnii), seen here in a water drop, has a life cycle that skips death: It reverts from a medusa back to a polyp. How, no one knows.

Jellies: Go with the Flow brings a new, custom-built, 1,700-square-foot permanent expansion to the Newport Aquarium. The ...

This colorful jellyfish is not one organism but a colony of four kinds of polyp. The stinging cells on the tentacles with which it fishes secrete a substance that is almost as toxic as cobra venom ...

Jellyfish are known for drifting to and fro at the whim of ocean currents—but not all species are so passive. The millions of golden jellyfish that pack Palau’s Jellyfish Lake spend much of ...

In Wolf Lake, Folino-Rorem found the freshwater jellyfish in the polyp stage, which is its primary stage and present throughout the year. The polyp stage is a precursor to the medusa stage ...

as the immortal jellyfish. This unique species was once the only creature on earth capable of returning to a polyp stage after stress, injury, and drastic changes in its environment. However ...