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Phylum Cnidaria > Class Anthozoa > Subclass Zoantharia/Hexacorallia > Order Scleractinia > Family Pocilloporidae
Cauliflower corals
Pocillopora sp.*
Family Pocilloporidae
updated May 13

Where seen? These small bushy branching hard corals are commonly seen on many of our Southern shores. From Danwei's paper, the species found on many of our shores is Pocillopora damicornis.

Features: Colony 10-20cm, generally a rounded bushy shape made up of short branches with blunt tips. Some have thinner branches, other have thick but flattened branches, and yet others have short lumpy branches. Corallites are small sunken and typically ringed by tiny wart-like bumps that stick out (verrucae), a distinguishing feature of Pocillopora species. It is hard to see the skeleton structure in a living cauliflower coral even when it is out of water at low tide. There always seems to be a layer of mucus over the entire colony.

The polyps are small (0.2-0.5cm) with a short body column and short blunt tentacles with white or blue tips. Tentacles are only extended at night. Cauliflower corals may produce short sweeper tentacles (2.5cm or less) that clear the surroundings of competiting corals and animals.

Another unusual property of cauliflower corals is the inclusion of large amounts of chitin in the skeleton. Chitin is the substance that insect exoskeletons are made of. The only other group of hard corals with this property are the mushroom corals of the genus Fungia.

Colony colours seen include yellow or brown with a bluish or greenish tinge. It is said that pink specimens produce hard skeleton more slowly, but these tend to outcompete and dominate brown ones. The pink colour comes from a pigment called pocilloporin whose function is still unknown. The pigment may have anti-predatory or immune system properties.

Cauliflower friends: The branches of the colony provide shelter for small animals such as shrimps and crabs. While most just shelter among the corals, some of these eat the polyps. The Red coral crab (Trapezia cymodoce) is found only in Cauliflower corals. It feeds on the mucus produced by the coral, and in return, protects the corals from predators.

Human uses: Cauliflower coral are among those harvested for sale as cheap souvenirs. Being tough, cauliflower coral are often kept in captivity and used in laboratory conditions. They are sometimes called the coral guinea pigs. They are among the best studied corals.

Labrador, Jun 05



Usually covered in mucus.
Pulau Hantu, May 05

Red coral crab in bleaching Cauliflower coral.
Cyrene Reef, Jul 10

Pulau Hantu, Aug 13

Corallites sunken, ringed by tiny bumps
that stick out.


Pulau Semakau, Feb 08

Terumbu Semakau, Jun 10
Recently dead bleached coral.

Kusu Island, Aug 04

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

Cauliflower corals on Singapore shores

Photos of Cauliflower corals for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map


Pulau Biola, Dec 09

Pulau Pawai, Dec 09

Pulau Sudong, Dec 09


Terumbu Berkas, Jan 10

Terumbu Berkas, Jan 10

Pulau Berkas, May 10

Bleaching.


Pulau Salu, Aug 10

Pulau Biola, Dec 09

Sightings shared by others:

Tanah Merah, May 09
Photo shared by Loh Kok Sheng on his blog.

Tanah Merah, Jun 10
Photo shared by Loh Kok Sheng on his flickr.

Pocillopora species recorded for Singapore
from Danwei Huang, Karenne P. P. Tun, L. M Chou and Peter A. Todd. 30 Dec 2009. An inventory of zooxanthellate sclerectinian corals in Singapore including 33 new records **the species found on many shores in Danwei's paper.
in red are those listed as threatened on the IUCN global list.

  Family Pocilloporidae
Genus Pocillopora
  Pocillopora damicornis (Cauliflower coral)**
Pocillopora verrucosa

Links

  • Pocillopora damicornis on Corals of the World online on the Australian Institute of Marine Science website: Technical fact sheet.
  • Pocillopora damicornis on the IUCN Red List of Threatened Species website: Technical fact sheet.
  • Pocillopora on Reef Corals of the Indo-Malayan Seas, the Marine Species Identification Portal: Technical fact sheet.
  • Pocillopora damicornis on SeaLife Base: Technical fact sheets.

References

  • Danwei Huang, Karenne P. P. Tun, L. M Chou and Peter A. Todd. 30 Dec 2009. An inventory of zooxanthellate sclerectinian corals in Singapore including 33 new records (pdf). Raffles Bulletin of Zoology Supplement No. 22: 69-80.
  • Veron, Jen. 2000. Corals of the World Australian Institute of Marine Science, Australia. 3 volumes.
  • Chou, L. M., 1998. A Guide to the Coral Reef Life of Singapore. Singapore Science Centre. 128 pages.
  • Erhardt, Harry and Daniel Knop. 2005. Corals: Indo-Pacific Field Guide IKAN-Unterwasserachiv, Frankfurt. 305 pp.
  • Borneman, Eric H. 2001. Aquarium Corals: Selection, Husbandry and Natural History T.F. H Publications. 464 pp.
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