Tiny
maretia heart urchin
Maretia planulata*
Family Spatangidae
updated Feb 09
Where
seen?
Small ones are sometimes seen on Pulau Semakau, in sandy areas of
the coral rubble area.According to Lane, were collected subtidally
at Pulau Semakau by dredging. Other larger ones are sometimes seen
on Pulau Sekudu, usually only their skeletons and seldom, living ones.
Features: About 2cm, body oval
mostly white. The sparse long spines directed backwards and are banded
orange and white, while there are more white short spines. The petaloid
is brownish with brownish patches on the upperside. On the underside,
there is a pale orange patten of five petals around the mouth. |

Pulau Semakau, Feb 09 
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This one seemed
to have popped out
of the sand, leaving a hole of the same shape.
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Side view.
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A few long banded spines, more short spines
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Underside.
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Anus is at the rear end.
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Pale petal pattern around the mouth.
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Pulau Semakau, Feb 09
Photo shared by Loh Kok Sheng on his
blog.
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*ID needs confirmation.
Links
- Maretia
on The
Echinoid Directory by Dr. Andrew B. Smith on the London Natural
History Museum website: everything you could possibly want to
know about heart urchins with lots of large close-up images and
explanatory diagrams. With technical descriptions of Order
Spatangoida
References
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