Upside-down jellyfish
Cassiopea xamachana
Cassiopea xamachana, commonly known as the upside-down jellyfish, is a jellyfish that usually rests on the seafloor with its bell facing downward and its tentacles pointing upward.Its tentacles contain tiny algae that use sunlight to make food, helping support the jellyfish through a close partnership.
Video
About this species
Species identity
Cassiopea xamachana, commonly known as the upside-down jellyfish, is a jellyfish that usually rests on the seafloor with its bell facing downward and its tentacles pointing upward.Its tentacles contain tiny algae that use sunlight to make food, helping support the jellyfish through a close partnership.
Where it lives
It lives in warm tropical and subtropical waters and it is commonly found in shallow coastal habitats such as lagoons, mangroves, seagrass beds, and sheltered bays. Because it relies partly on sunlight through its symbiotic algae, it prefers clear, shallow waters where light can easily reach the seafloor.
Role in the ecosystem
It plays an important role in maintaining healthy seagrass meadows by grazing on seagrass. This helps keep the plants productive and creates habitat for many other marine species. Through its feeding activities, it supports the balance and biodiversity of coastal ecosystems.
Scientific reference
Citation
Ocean Literacy Connections
This resource can be explored through Ocean biodiversity.
- How do ocean habitats support so many forms of life and interaction?
Explore and connect
Open the primary consumer view and compare this species with related marine life.
FAQ
Why does Cassiopea xamachana lie upside down?
It rests with its tentacles facing upward so the tiny zooxanthella living inside its tissues can receive as much sunlight as possible for photosynthesis.
Can Cassiopea xamachana sting?
Yes, it has stinging cells on its tentacles that help it capture food and protect itself, although its sting is usually mild for most people.