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Phylum Echinodermata > Class Holothuroidea
Sea apple sea cucumber
Pseudocolochirus violaceus/axiologus
Family Cucumariidae
updated Dec 08
Where seen? This amazing technicolour sea cucumber is sometimes seen on our undisturbed Northern shores, attached to coral rubble.

Features: 10-20cm long. Body long or spherical with five rows of yellow tube feet, but the two rows on the upper side of the body are usually less distinct. It is usually red on the upperside, shading to lilac and white to the underside. The mouth is ringed with blue. During low tide, it retracts its colourful feeding tentacles. When relaxed, the normal shape is short and sausage-like as with most other sea cucumbers. When stressed, however, it may inflate itself into a large round ball.

Human uses: These beautiful sea cucumbers unfortunately are harvested for the aquarium trade. Ironically, they do not make good aquarium specimens as they are often toxic to their tank mates.

Status and threats: This sea cucumber is listed as 'Vulnerable' on the Red List of threatened animals of Singapore. It is threatened by land reclamation and over-collection by beach combers. Like other fish and creatures that are harvested from the wild, most die before they can reach the retailers. Without professional care, most die soon after they are sold. Those that do survive are unlikely to breed.

Changi, May 10
Colourful feeding tentacles.

Changi, May 10

Underside.
Changi, May 10

Inflated.
Chek Jawa, May 02

Backside.

Yellow tube feet.


Chek Jawa, Jun 02

Beting Bronok, Jul 05

Beting Bronok, Jun 03

Sea apple sea cucumbers on Singapore shores

Pulau Sekudu, Dec 03

Chek Jawa, May 02

Changi, Jun 08


Beting Bronok, Feb 06


Beting Bronok, Jun 06


Pulau Sekudu, Jul 03

Changi, Jul 11

Changi, Jul 11

Links
  • Sea apples on Aquarium Invertebrates by Dr Rob Toonen on the Advanced Aquarist's Online Magazine: details the toxic nature and low success rate of keeping these animals in captivity.
References
  • Lane, David J.W. and Didier Vandenspiegel. 2003. A Guide to Sea Stars and Other Echinoderms of Singapore. Singapore Science Centre. 187pp.
  • 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.
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