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Phylum Cnidaria > Class Anthozoa > Subclass Zoantharia/Hexacorallia > Order Scleractinia > Family Acroporidae
Pebble coral
Astreopora sp.*

Family Acroporidae
updated Nov 2019
Where seen? This hard coral with a pebbly surface is sometimes seen on some of our Southern shores.

Features: Colonies large (about 20cm or more). Colonies are solid (massive) and may be dome-shaped or encrusting, with a few species forming tiers of thick plates. Corallites small, circular opening (1cm or less), usually in a blunt conical shape. The many conical shapes result in a pebbled appearance. The corallites and the surface between corallites usually covered with tiny bumps. New corallites emerge in between existing corallites. The polyps look like tiny sea anemones with 24 tentacles that are flat and petal-like, and a thick body column. Extended polyps usually only seen at night. Colours seen include brown, blue, green sometimes with tinges of other colours.

Sometimes mistaken for Turbinaria or Echinopora species.

Status and threats:
Some of our Pebble corals are listed as threatened on the IUCN global listing. Like other creatures of the intertidal zone, they are affected by human activities such as reclamation and pollution. Trampling by careless visitors, and over-collection by hobbyists also have an impact on local populations.


Terumbu Pempang Tengah, May 11

Polyps with 24 flat, petal-like tentacles.


Pulau Hantu, Jun 08

Pulau Hantu, Apr 06

Terumbu Pempang Tengah, May 11

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

Pebble corals on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores


Sentosa Tg Rimau, Aug 20
Photo shared by Loh Kok Sheng on facebook.
 


St. John's Island, May 10
Photo shared by Loh Kok Sheng on his blog.

St. John's Island, Apr 21
Photo shared by Loh Kok Sheng on facebook.

Terumbu Semakau, Jun 10
Photo shared by Loh Kok Sheng on his flickr.


Pulau Berkas, May 10

Pulau Berkas, May 10

Pulau Berkas, May 10


Pulau Biola, May 10

Pulau Pawai, Dec 09

Terumbu Salu, Jan 10


Pulau Salu, Jun 10
Bleaching.

Pulau Senang, Aug 10
Photo shared by Loh Kok Sheng on his flickr.
 

Astreopora 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.
*Groups based on in Veron, Jen. 2000. Corals of the World.
in red are those listed as threatened on the IUCN global list.

  Family Acroporidae
Genus Astreopora
  Group 1: Plate-like species
Astreopora expansa (Near Threatened)

Group 2: Encrusting species
Astreopora incrustans (Vulnerable)

Group 3: Boulder shaped (massive) species with small corallites
Astreopora listeri

Group 4: Boulder shaped (massive) species with middle-sized or large corallites
Astreopora cucullata
(Vulnerable)
Astreopora gracilis**
Astreopora myriophthalma**

Links

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.
  • 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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