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Phylum Echinodermata > Class Stelleroida > Subclass Asteroidea
Spiny sea star
Gymnanthenea laevis
Family Oreasteridae
updated Oct 2016

Where seen? This sea star is sometimes seen, usually on our Northern shores. In seagrass meadows and coral rubble.

Features: Diameter with arms 7-15cm. Usually five arms long with rounded tips. The body is bordered by large, block-like scalloped plates with huge pedicellaria (pincer-like structures), with many spiny bumps along the arms. On the upper side, there are many spiny bumps, sometimes with very lage flat plate-like spines. Colours seen generally mottled brown or grey, sometimes with orange arm tips. Bright orange ones are sometimes seen. The underside is pale usually without any patterns. Each plate on the underside has a huge bivalved pedicellaria (pincer-like structures). The pale tube feet are tipped with suckers.

Sometimes confused with the Biscuit sea star (Goniodiscaster scaber) and the Cake sea star (Anthenea aspera). Here's more on how to tell apart large sea stars on our shores.

Chek Jawa, Oct 08
Large plate-like spines on upperside.

Underside may be plain or spotted.

Large bivalved pedicelleria on the underside.

Large block-like plates on sides of the arms.
Spines on the tips of the arms.

Spiny sea stars on Singapore shores

Photos of Spiny sea stars for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map


Tanah Merah, Aug 09

Photo shared by Loh Kok Sheng on his blog.

East Coast, Jul 09
Photo shared by Loh Kok Sheng on his blog.


Cyrene Reef, May 08

Photo shared by Loh Kok Sheng on his blog.


Cyrene Reef, Jul 10

Photo shared by Toh Chay Hoon on her blog.

Links

References

www.flickr.com
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