corallimorphs text index | photo index
Phylum Cnidaria > Class Anthozoa > Subclass Zoantharia/Hexacorallia > Order Corallimorpharia
White-tip corallimorphs
Rhodactis indosinensis
Family Discosomidae
updated Nov 2019
Where seen? This small animal with white bulbous tips on its tentacles is often seen in clusters of several tucked among dead and living corals. Sometimes seen on some of our Southern shores.

Features: Diameter with tentacles extended 2-4cm. Tentacles many, thick with bulbous tip, sometimes with a nipple; white or pale green. Body column short, with narrow ridges, pale. Oral disk usually maroon brown. Central mouth slightly protruding. It doesn't seem to be able to tuck its tentacles completely into the body column, although it can retract the tentacles.

A study found that Rhodactis indosinensis can also look like Carpet corallimorphs.

Kusu Island, Jun 12

Terumbu Pempang Tengah, Jul 12

Terumbu Pempang Tengah, Jul 12

Terumbu Pempang Tengah, Jul 12

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

White-tip corallimorphs on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

Pulau Tekukor, Jun 16
Photo shared by Geraldine Lee on facebook.
Terumbu Buran, Jan 10
Photo shared by Loh Kok Sheng on flickr.

Lazarus Island, Feb 21
Photo shared by Richard Kuah on facebook.

Terumbu Semakau, May 10
Photo shared by James Koh on his blog.

Pulau Semakau South, Jul 15
Photo shared by Marcus Ng on facebook.

Pulau Semakau East, Jan 16
Photo shared by Loh Kok Sheng on facebook.


  • 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.
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