🪼 Chrysaora, commonly known as sea nettles, represents one of the most widespread and ecologically significant genera of scyphozoan jellyfish. These cnidarians are characterized by their bell-shaped medusae with long, trailing tentacles armed with potent nematocysts used for prey capture and defense. The genus exhibits remarkable morphological diversity, with species varying dramatically in size from small coastal forms to massive oceanic varieties like C. fuscescens, which can reach bell diameters exceeding one meter. Their radial symmetry typically follows a four-fold pattern, with four oral arms and multiples of four marginal tentacles.⁠ ⁠ The life cycle of Chrysaora species exemplifies the complex metagenesis typical of scyphozoans, alternating between sessile polyp and free-swimming medusa stages. Environmental factors such as temperature, salinity, and nutrient availability critically influence their population dynamics and distribution patterns. Many species demonstrate seasona...