Spotted lagoon jellyfish

Jellyfish have been around a long time…

The earliest jelly fossils are from 600 million years ago! Jellyfish were thriving long before the first insects, trees, flowers or dinosaurs. There are over 200 species of jellyfish in the world, including the beautiful spotted lagoon jellyfish.

Spotted lagoon jellyfish
…and probably will be with us a lot longer
The jellyfish's ancient and simple body structure make it resilient—it can survive where other animals can't. For example, jellies can live in oceanic "dead zones" where oxygen is low, and they also do well in warm temperatures that kill corals and other creatures. Some scientists are concerned that there is an "explosion" of jellyfish these days, and that large jelly populations may have negative impacts on young fish and on marine fisheries.
Wearing your mouth on your sleeve?
Spotted lagoon jellies have what biologists call "oral arms"—eight frilly-looking appendages that hang down from the jelly’s bell. Each oral arm contains many small, mouth-like openings. As they extend away from the bell, the oral arms dramatically change in structure and are called terminal clubs. There are no mouths on the terminal clubs. This is in contrast to the majority of jellies, which have a single, centrally located mouth in the middle of the underside of their bell.
The cowardly lion thought he had it bad
Spotted lagoon jellies aren't only missing a heart, they don't have a brain or blood either. Like all jellies, approximately 95 of their body is water.
More than one way to fill up
All jellies are filter feeders: they trap tiny, planktonic organisms with stinging cells and then transport these food items to their mouth. A few species, including spotted lagoon jellies, are also photosynthetic. They culture algae within their bodies and it’s this algae that converts the sun’s energy into useful products like sugars and oxygen. This is essentially the exact same process seen in most tropical corals, giant clams and some sponges.

In the sheltered waters where they are normally found, spotted lagoon jellies follow the sun as it travels from east to west, then they sink down to lower depths as the sun sets. They are actually strong swimmers (as jellies go) and are capable of daily migrations to follow available sunlight in a way that most planktonic animals aren’t.
Do you know what to call a group of jellyfish?
Well, they're called a "smack of jellyfish!" Also known as a "bloom" or a "swarm."
Have you heard about National Jellyfish Day?
It's November 3 every year.

Map


Spotted lagoon jellyfish range

Quick Facts

Diet: Carnivore
Size: 4" to 6"