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Phylum Echinodermata > Class Stelleroida > Subclass Asteroidea
Crown sea star
Aquilonastra coronata

Family Asterinidae
updated Oct 2016

Where seen? This little sea star is sometimes seen, usually under stones at the mid-water line, or on coral rubble on our Northern shores. Sometimes it may be seen wandering among seaweeds far from the midwater line, especially at night. In some locations at some times of the year, they can be found in large numbers, but usually well spaced apart. It was previously known as Asterina coronata.

Features: Diameter with arms 3-5cm. A plump sea star (not flat) with short fat semi-cylindrical arms that have rounded tips. The upper surface has tiny holes through which short stubby transparent finger-like structures (papulae) emerge. Underneath, in grooves under the arms, are somewhat long slender tube feet that end in suckers. It can stick its 'stomach' out of its mouth. Colours plain or mottled beige, brown or grey. Sometimes, bright orange ones are seen! Sometimes, individuals are seen 'carrying' bits of debris.

Tiny brittle stars and tiny snails are sometimes seen on the underside.

Changi, Aug 11

Upperside.

Underside.
Pulau Sekudu, Jul 06

Stubby papulae on the upperside.


Chek Jawa, Jul 05

Stubby papulae on the upperside.

Crown sea stars on Singapore shores

Photos of Crown sea stars for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map


Tuas, Jun 15
Photo shared by Loh Kok Sheng on facebook.

Pulau Ubin OBS, Jan 16
Photo shared by Marcus Ng on facebook.
 


East Coast Park, Feb 16
Photo shared by Loh Kok Sheng on his blog.

East Coast Park, Marina Bay, Oct 15
Photo shared by Loh Kok Sheng on flickr.
 

References
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