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 small adult jellies. However, not ...
This fingernail-sized, unassuming creature possesses the rare ability to revert back to its juvenile polyp stage after reaching maturity, which is an early stage in the life cycle of a jellyfish ...
The larva will move about in the current until it finds a hard surface to establish itself. It will then start to mature and grow. Larvae mature into polyps, which will then bud off and mature into ...
Some species never grow up; they remain branching colonies of polyps. And one hydrozoan, the immortal jellyfish (Turritopsis dohrnii), seen here in a water drop, has a life cycle that skips death ...
Like most jellyfish species, it begins life as a larva, which settles on a surface and grows into a polyp, which is a blob-like cyst. This is the stage where the jellyfish is still attached to the ...