hard corals text index | photo index
Phylum Cnidaria > Class Anthozoa > Subclass Zoantharia/Hexacorallia > Order Scleractinia > Family Acroporidae
Acropora corals
Acropora sp.

Family Acroporidae
updated Nov 2019
Where seen? These corals can form delicate colonies that resemble miniature underwater forests. They are always a delight to encounter. Sometimes seen on many of our Southern shores, larger colonies are more commonly seen on undisturbed and remote reefs. The genus Acropora has the largest number of species of all the hard corals. The scientific name is usually pronounced as 'ah-crop-or-ah'.

Features: Colonies seen usually 15-20cm, but on undisturbed shores can be 50cm or larger. Many grow into branching forms that give rise to common names like 'staghorn coral'. For some, the entire colony often has a flat top so they are sometimes also called 'table-top' or 'table coral'. Others appear bushy. Branches are generally cylindrical with corallites appearing all around the branch.

Corallite tiny (0.5cm) smooth cups or tubes. Acropora corals have a distinctive corallite, usually at the tip of the branch, that is larger than the other corallites. This is called an axial corallite. New corallites (called secondary or radial corallites) bud off along the sides while the axial corallite continues to grow upwards on the tip of the branch. The axial corallite lacks zooxanthellae but grows rapidly as it is fed by other areas of the colony. The tips are often white or brightly coloured.

Polyps tiny (0.2-0.5cm), with long tapering tentacles. When fully extended, the colony can appear 'furry'.

Sometimes mistaken for branching pocilloporid corals (Family Pocilloporidae).

There are probably several different species on these pages. It's hard to distinguish them without close examination of small features. On this website, they are grouped by large external features for convenience of display.

As a group, acropora corals are adaptable and found in a wide range of habitats from murky waters to wave-pounded areas and some can survive regular exposure at low tide. These protect themselves with a thick mucus coat and UV-absorbing substances. They come in a wide variety of colours.

Some acropora corals are rather delicate and will shatter if they are knocked against. So please do not touch them, in fact, we should not touch any living hard corals.

Some acropora coral form table-like colonies.
Raffles Lighthouse, Jun 07

Corallites with tentacles contracted.
Sisters Island, Dec 05

With the tentacles extended,
the colony can appear 'furry'.
Pulau Semakau, Apr 08
Role in the habitat: Acropora corals are among the important building blocks of a reef. Together with Montipora species, also members of the Family Acroporidae, acropora corals account for one-third of reef-building coral species. Acropora corals include some of the fastest growing hard corals. Their branching forms provide shelter to a wide variety of animals, from small fishes to tiny clams, small crabs to shrimps.

Producing mucus to protect themselves.
Pulau Semakau, Mar 05

The coral turns pink when stressed.
Pulau Semakau, Feb 19

Coral scallop
Sisters Island, May 08

Machine gun shrimp
Kusu Island, Jun 10
Photo shared by Loh Kok Sheng on his blog.

Bandit coral crab
Sisters Islands, Mar 06

Acropora goby
Sisters Islands, Dec 05
Human uses: Acropora corals are popular in the live aquarium trade and wild colonies are often taken from the natural reefs to supply this demand. Efforts to breed and raise acropora corals have been successful and it is hoped this supply will reduce collection from the wild. Although captive bred acropora corals are healthier and easier to care for than wild collected specimens, captive bred corals are more expensive.

Status: While a few species are listed as Endangered and Vulnerable, for most there is inadequate information as at 2024 to make an informed assesment of the conservation status of the recorded Acropora corals in Singapore.

Some Acropora corals on Singapore shores



Acropora coral @ Pulau Hantu 17Apr2010 from SgBeachBum on Vimeo.


Elegant acropora coral (Acropora sp.)

Acropora species recorded for Singapore
from 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.
in red are those listed as threatened in the above.

  Acropora corals seen awaiting identification
Species are difficult to positively identify without close examination with a microscope. On this website, they are grouped by external features for convenience of display.
  Elegant acropora
Pinecone acropora
Staghorn acropora
Stumpy acropora
Tubular acropora

  Family Acroporidae
Genus Acropora
  Acropora abrotanoides
Acropora aculeus (Bottlebrush coral)
Acropora acuminata (VU Vulnerable)
Acropora anthocercis (VU Vulnerable)
Acropora aspera (EN Endangered)
(Green staghorn coral)
Acropora austera
Acropora cerealis
Acropora chesterfieldensis
Acropora cytherea (Table coral)
Acropora digitifera (EN Endangered)
(Staghorn coral)
Acropora divaricata
Acropora donei (Purple-tipped acropora)
Acropora elseyi (Bottlebrush coral)
Acropora florida
Acropora glauca
Acropora grandis (Brook, 1892) Not Listed DD
Acropora granulosa (Tubular table coral)
Acropora horrida (Blue staghorn coral)
Acropora humilis (Finger coral)
Acropora hyacinthus (Brush coral)
Acropora intermedia
Acropora latistella
Acropora longicyathus
Acropora loripes (Blue tip coral)
Acropora lutkeni
Acropora microclados
Acropora microphthalma (Small staghorn coral)
Acropora millepora (EN Endangered)
(Plate acropora coral)
Acropora muricata (Staghorn coral)
Acropora nana
Acropora nasuta (EN Endangered)
(Branching staghorn coral)
Acropora palmerae
Acropora polystoma
Acropora pulchra
Acropora robusta
Acropora samoensis
Acropora secale
Acropora selago
Acropora solitaryensis
Acropora spicifera (EN Endangered)
Acropora subglabra (EN Endangered)
Acropora subulata
Acropora tenuis
Acropora valenciennesi
Acropora valida
Acropora verweyi
Acropora willisae



Links

References

  • 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.
  • 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
  • Wee Y.C. and Peter K. L. Ng. 1994. A First Look at Biodiversity in Singapore. National Council on the Environment. 163pp.
  • Davison, G.W. H. and P. K. L. Ng and Ho Hua Chew, 2008. The Singapore Red Data Book: Threatened plants and animals of Singapore. Nature Society (Singapore). 285 pp.
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