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Phylum Echinodermata > Class Stellaroida > Subclass Ophiuroidea
Upsidedown brittle star
Ophiothrix sp.
Family Ophiotrichidae
updated Oct 10

Where seen? This sea star with an odd preference to be upside down is sometimes seen among seaweeds and seagrasses on our Northern shores. Especially active at night.

Features: Disk diameter less than 1cm, arms about 5cm long. Disk thick, petal-shaped. Arms long with blunt cylindrical spines held like a bottle brush. Often seen upside down and if turned the right side up will turn upside down again. This may be an adaptation to feeding on substances on the water surface.


Pulau Sekudu, Jun 05

Upperside.

Underside.

Upsidedown brittle stars on Singapore shores

Pulau Sekudu, Apr 06

more photos of upsidedown brittle stars on Singapore shores
part 1 | part 2

References
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