Phylum Echinodermata > Class Echinodea > heart urchins
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

This one seemed to have popped out
of the sand, leaving a hole of the same shape.
.
Side view.

A few long banded spines, more short spines

Underside.

Anus is at the rear end.

Pale petal pattern around the mouth.


Pulau Semakau, Feb 09
Photo shared by Loh Kok Sheng on his blog.

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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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