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Phylum Cnidaria > Class Anthozoa > Subclass Alcyonaria/Octocorallia > Order Alcyonacea
Flowery soft corals
Family Nephtheidae
updated Oct 2016
if you learn only 3 things about them ...
They are animals! Although they look like plants. Don't step on them!
Each soft coral is a colony of countless tiny polyps.
Tiny animals may live in the colony. Look for them.

Where seen? Flowery soft corals are commonly seen on many of our shores. They are usually attached to hard surfaces including boulders, jetty pilings and coral rubble.

Features: Colonies are usually 15- 20cm in diameter but may be larger. When submerged, these soft corals look like bushes. The common tissue is generally rubbery, stiff and rough to the touch. A thick 'main trunk' attaches to a hard surface on one end, with many small branches on the other end.

Only one kind of polyp (autozooids) usually clustered at the tips of the colony's 'branches'. Polyps are tiny (0.5cm or smaller) and have eight short tentacles with 1 row of fine branches. The polyps can be closed but cannot be retracted. The polyps may be white, beige or other colours such as purple.

In some, the polyps are supported by large spindle-shaped sclerites (tiny spikes of calcium carbonate) that stick out of the common tissue and gives the colony a spiky, prickly look. Sclerites may also be embedded in the fleshy supporting tissues that forms the 'stem' or 'branches'. The sclerites are often brightly coloured.

Flowery soft corals come in a variety of colours from pink, red, orange to purple, blue, brown, yellow and white.

Some species can be abundant in areas with fast but one-way flow of water. But they are not often found in areas exposed to strong waves. They can also grow in murky areas.

The fire anemone (Actinodendron sp.) looks similar to a flower soft coral. Unlike the soft coral, however, the anemone has a powerful sting. So be careful!

Flowery babies: Some species reproduce by dropping a branch. Others may drop polyp bundles. These may settle down and become attach to a surface and start growing as a new colony. This is called 'polyp bail-out'.

What do they eat? Some flowery soft corals harbour microscopic, single-celled symbiotic algae (zooxanthellae) within their bodies. The algae undergo photosynthesis to produce food from sunlight. The food produced is shared with the host, which in return provides the algae with shelter and minerals.

Other flowery soft corals don't have zooxanthellae and gather edible bits from the water. Generally, those with zooxanthellae tend to be brown or have other boring dull colours.

Flowery friends: Many kinds of small animals may be found on flowery soft corals. These include tiny transparent shrimps, porcelain crabs, brittle stars and false cowries.

Human uses: Soft corals protect themselves with unusual substances that are being studied for possible anti-cancer properties. These beautiful and delicate animals are also harvested from the wild for the aquarium trade. Collection methods usually harm the soft coral and other marine life and many specimens die before they even reach the retailer. Many more die in home aquariums due to lack of proper care. Living coral reefs, however, are worth far more to humans when they left alone. Reefs bring in tourists which generate business beyond the shore (e.g., hotels, restaurants and travel-related industries).

Status and threats: None of our flowery corals are listed among the endangered animals of Singapore. However, 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.

When the brown polyps are retracted,
the colony can appear different.
Pulau Hantu, Apr 04



Polyps tiny with eight branched tentacles.
Pulau Hantu, Jan 12


Polyps reinforced with large sclerites.
Tuas, Dec 11


Tiny brittle star in the soft coral.
Cyrene Reef, Dec 08


Tiny porcelain crab in the soft coral.
Beting Bronok, Jun 06

Tiny red nose shrimp in flowery soft coral.
Tuas, Nov 03

Tiny colourful brittle star in flowery soft coral.
Tuas, Nov 03

False cowrie snail.
Chek Jawa, Apr 08

Flowery soft corals on Singapore shores


Asparagus flowery soft corals

Bushy, don't have spikes.

Pink flowery soft corals

Pink bushy, don't have spikes.
 


Smooth flowery soft corals

Long branches, without spikes.

Spiky flowery soft corals

Long branches, with spikes.

Ball flowery soft corals

Spherical, with spikes.

Family Neptheidae on Singapore Shores
Wee Y.C. and Peter K. L. Ng. 1994. A First Look at Biodiversity in Singapore.
*from Erhardt, Harry and Daniel Knop. 2005. Corals: Indo-Pacific Field Guide.
+from our observation.


  *Family Neptheidae
  Dendronephthya sp. (Pink flowery soft coral and Ball flowery soft coral)
+Nepththea sp. (Asparagus flowery soft coral)
+Stereonephthya sp. (Spiky flowery soft coral)
+Litophyton sp. (Smooth flowery soft coral)

Links

References

  • 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
  • Fabricius, Katharina and Philip Alderslade, 2001. Soft Corals and Sea Fans. Australian Institute of Marine Science and the Museum and Art Gallery of the Northern Territoriy. 264 pp
  • Edward E. Ruppert, Richard S. Fox, Robert D. Barnes. 2004.Invertebrate Zoology Brooks/Cole of Thomson Learning Inc., 7th Edition. pp. 963
  • Pechenik, Jan A., 2005. Biology of the Invertebrates. 5th edition. McGraw-Hill Book Co., Singapore. 578 pp.
  • Wee Y.C. and Peter K. L. Ng. 1994. A First Look at Biodiversity in Singapore. National Council on the Environment. 163pp.
  • Ng, P. K. L. & Y. C. Wee, 1994. The Singapore Red Data Book: Threatened Plants and Animals of Singapore. The Nature Society (Singapore), Singapore. 343 pp.
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