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Phylum Cnidaria > various classes | jellyfish
Mangrove jellyfish
Acromitus sp.
Family Catosylidae
updated Dec 2019
Where seen? This energetic little jellyfish is sometimes seen in large numbers near mangrove, e.g., at the mouth of mangrove streams, and in estuarine seagrass meadows on our Northern shores.

Features: Bell about 6-8cm in diameter. Each fat sausage-like oral arm has a long 'tail'. Moves in short bobs as it energetically contracts its small bell.

Sungei Buloh Wetland Reserve, Feb 09
Photo shared by Brandon Chia

Pulau Ubin, Apr 09

Chek Jawa, Apr 08

Mangrove jellyfishes on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

Chek Jawa, Dec 12
Photo shared by Loh Kok Sheng on flickr.

Bloom of Mangrove jellyfish (Acromitus sp.)

Pasir Ris mangroves, Dec 10.

mangrove jellyfish from SgBeachBum on Vimeo.

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



  • Uwe Will & Iffah Iesa. River jellyfish, Acromitus hardenbergi, at Sungei Buloh. 30 November 2017. Singapore Biodiversity Records 2017: 156-157 ISSN 2345-7597. National University of Singapore.
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