Sea
apple sea cucumber
Pseudocolochirus violaceus
Family Cucumariidae
updated
Apr 2020
Where
seen? This amazing technicolour sea cucumber is sometimes
seen on our Northern shores, among seagrasses or attached to rubble.
Features: 10-20cm long. Body long
or spherical with five rows of tube feet that are bright yellow long slender, but the two rows
on the upper side of the body are usually less distinct. Body usually
red on the upperside, shading to lilac and white to the underside.
The mouth is ringed with blue. Feeding tentacles red, branched tips may be tinged purple, yellow and white. During low tide, it retracts its colourful
feeding tentacles. Anus is surrounded by five tiny teeth-like structures that are bright yellow. 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. |
Changi, May 10 |
Colourful feeding tentacles. |
Small one.
Changi, Jun 19
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Backside.
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Yellow tube feet.
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Inflated.
Chek Jawa, May 02
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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. |
Sea
apple sea cucumbers on Singapore shores |
Other sightings on Singapore shores |
Changi Loyang, May 17
Photo shared by Loh Kok Sheng on facebook.
|
Changi Loyang, Jun 23
Photo shared by Loh Kok Sheng on facebook.
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Changi Creek, Jun 20
Photo shared by Marcus Ng on facebook.
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Chek Jawa, Jul 16
Photo shared by Loh Kok Sheng on facebook.
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Pulau Sekudu, Jul 20
Photo shared by Loh Kok Sheng on facebook.
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East Coast PCN, Aug 23
Photo shared by Kelvin Yong on facebook.
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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.
- Pseudocolochirus violaceus (Dendrochirotida: Cucumariidae) Sea Apple Cucumber by Lee Sui Kei Rachel, 2016, on taxo4254.
- Pseudocolochirus violaceus on SeaLife Base: Technical
fact sheet.
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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