Most animals move through life in one direction, growing, aging, and eventually dying without any way back. A small, ...

Jellyfish are among the oldest animals on Earth, found in all the world's oceans and serve as valuable model systems for biological research. Microbiologists at Kiel University (CAU) have now shown ...

Box jellyfish are often feared as dangerous animals, with some species capable of causing severe or even fatal stings. However, box jellyfish nematocysts—organelles responsible for this toxic ...

Sperm transfer in Copula sivickisi. The male (above) produces and transfers a spermatophore while grasping the female by the tentacles; the female (below) receives the spermatophore. Box jellyfish are ...

A jellyfish smaller than a pinky fingernail has a survival trick that has fascinated scientists for decades. Turritopsis dohrnii, often called the ‘immortal jellyfish’, can reverse its development ...