Enw gwyddonol: Chrysaora hysoscella
It's easy to see where the Compass Jellyfish got its name when you spot its brown markings - they look just like a compass!
YstadegauBell: Up to 30cm across
Pryd i'w gweldMay to October
YnghylchThe Compass Jellyfish is a summer visitor to our shores, feeding on small fish, crustaceans and even other jellyfish. They get their name from the distinct brown pattern on their bell - a radial pattern that resembles a compass. They often wash ashore in summer months and it is this brown radial pattern that can be used to identify them on the beach. They give a nasty sting though - so look, but don't touch. If you are stung, jellyfish often leave the tentacle on your skin - it will continue to sting you even when not connected to the body! Scrape the area with a clean stick or remove the tentacle with tweezers if you have them to hand, then rinse the area with warm to hot water to reduce swelling.
Sut i'w hadnabodA translucent yellowish-white jellyfish with brown markings around the fringe and on the top of the bell. Those atop the bell resemble a compass, with V shapes radiating out from a central point. They have a bunch of frilled oral arms below the bell and long thin marginal tentacles around the fringe of the bell.
Don't get too close to those tentacles though, they give a nasty sting.