cassiopea upside-down jellyfish is a genus of true jellyfish

animal animals aquarium aquatic background bay beautiful beauty black blue bright cassiopea cassiopeidae cnidarian colorful contractile coral deep dive diving ecosystem egypt environment exotic explore family fish genus holiday jellies jelly jellyfish life light marine members nature ocean only red reef saltwater schyphozoa scuba sea species swim travel tropical true undersea underwater upside upsidedown water wildlife