corallimorphs text index | photo index
Phylum Cnidaria > Class Anthozoa > Subclass Zoantharia/Hexacorallia > Order Corallimorpharia
Beaded corallimorph
Discosoma nummiforme
Family Discosomidae
updated Nov 2019

Where seen? This little disk-like animal with round bead-like bumps is sometimes seen in small groups on coral rubble on many of our Southern shores.

Features: Each polyp 2-4cm in diameter, sometimes seen in groups of 5-10 polyps. Tentacles are bead-like, forming sparse rows that radiate from the central mouth. The mouth is often seen held upturned and is quite prominent. The outer edge of the oral disk is smooth (does not have a fringe of tentacles).
Colours seen include beige, green, blue, purple, pink. Sometimes several different colours seen on one animal. The underside is smooth and brown. The animal can tuck its oral disk into its body column when it is exposed out of water.

A study found that Discosoma nummiforme can also look like Stubby corallimorphs.

St. John's Island, May 05

Upturned mouth.

St. John's Island, May 06

Smooth underside.

Sisters Island, Jul 10

Sisters Island, Aug 09

*Species are difficult to positively identify without close examination.
On this website, the animals are grouped by external features for convenience of display.

Beaded corallimorphs on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

Pulau Jong, Jan 10
Photo shared by James Koh on flickr.

Terumbu Hantu, Jun 13
Photo shared by Loh Kok Sheng on flickr.

Terumbu Semakau, Apr 21
Photo shared by James Koh on flickr.

Terumbu Pempang Tengah, Jun 20
Photo shared by Dayna Cheah on facebook.

Terumbu Pempang Darat, Jun 10
Photo shared by James Koh on his blog.


  • Corallimorpharia on The Biodiversity of Singapore website, Lee Kong Chian Natural History Museum.


  • Ren Min Oh, Mei Lin Neo, Nicholas Wei Liang Yap, Sudhanshi Sanjeev Jain, Ria Tan, Chaolun Allen Chen and Danwei Huang Citizen science meets integrated taxonomy to uncover the diversity and distribution of Corallimorpharia in Singapore, The Raffles Bulletin of Zoology Volume 67, Pp. 306-321.
links | references | about | email Ria
Spot errors? Have a question? Want to share your sightings? email Ria I'll be glad to hear from you!
wildfactsheets website©ria tan 2008