Crystal Jellies

The crystal jellyfish (Aequorea victoria) evolved to thrive in the open oceans of the Pacific, developing adaptations like bioluminescence for survival in deep, dim waters.

Over time, they acquired specialized proteins—aequorin and green fluorescent protein (GFP)—which allow them to produce and emit light, aiding in predator evasion and communication.

Their nearly transparent, gelatinous body minimizes visibility, an evolutionary advantage against visual predators.

As hydrozoans, they evolved from simpler cnidarian ancestors, gradually refining their radial symmetry, nerve nets, and stinging cells (nematocysts) for capturing planktonic prey, making them both elusive and efficient in the pelagic ecosystem.