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Phylum Cnidaria > jellyfish > Class Scyphozoa > Order Rhizostomeae
Fat-armed jellyfish
Catostylus sp.
Family Catosylidae
updated Sep 2025
Where seen? This large jellyfish is sometimes seen on some of our shores. Usually alone, not in groups of many individuals.

Features: Bell about 10cm in diameter with fat sausage-like oral arms. The arms do not have a long 'tail'.

Status and threats: There is inadequate information as at 2024 to make an informed assesment of its conservation status in Singapore.

Changi, Apr 05

Fat-armed jellyfishes on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores


Tanah Merah, Dec 10
Photo shared by Loh Kok Sheng on his blog.

Lazarus Island, Mar 16
Photo shared by Jonathan Tan on facebook.
 

Jellyfish swimming in oil slick Tanah Merah from Loh Kok Sheng on Vimeo.


Acknowlegement
With grateful thanks to Dr Michael N Dawson of the University of California, Merced for identifying this jellyfish.

Links
  • Checklist of Cnidaria (non-Sclerectinia) Species with their Category of Threat Status for Singapore by Yap Wei Liang Nicholas, Oh Ren Min, Iffah Iesa in G.W.H. Davidson, J.W.M. Gan, D. Huang, W.S. Hwang, S.K.Y. Lum, D.C.J. Yeo, May 2024. The Singapore Red Data Book: Threatened plants and animals of Singapore. 3rd edition. National Parks Board. 663 pp.
  • The Scyphozoan website by Dr Michael N Dawson: lots of info about jellyfishes in Class Scyphozoa.
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