learn only 3 things about them ...
These tiny animals are everywhere on the shore. Don't
step on them!
Look for them among cracks in large boulders as well.
tuck their tentacles into their bodies at low tide.
seen? These small anemones are often seen on our rocky
areas that are exposed even at moderate tides. Usually in clusters
of many individuals. Crowded near the base of boulders, in crevices
and cracks of the boulders and even in the sand nearby.
When exposed to air at low tide, it tucks its tentacles into its body
column so it looks like a bead of jelly. Those in the sand may retract
completely, leaving only little holes. It is easy to miss these small
delicate animals and to accidentally step on them.
To see one with the tentacles expanded, look for pools where some
might still remain submerged.
Features: Diameter with tentacles
expanded 1-2cm. One ring of tapering tentacles with a banded pattern.
The oral disk is relatively large compared to the tentacles and is
sometimes patterned. The entire animal is usually in shades of brown
and beige. Although often found in groups of many individuals packed
close to one another, it is a solitary polyp and not a colonial animal.
There are several species of Anthopleura that may be found
near one another and are hard to distinguish in the field.
Anthopleura handi: Occurs in smaller numbers of larger
individuals. The anemone and its veruccae are a dull grey green.
Anthopleura dixoniana: Occurs in large numbers of smaller
individuals. The anemone's oral disk has a distinctive pale-dark chequer-board
pattern. It is darker with dark body column and verrucae that are
lighter than the body column.
Anthopleura nigrescens: Compared to A. dixoniana,
individuals are larger with a darker body column, more conspicuous
verrucae and the bumps around the top of the body column under the
tentacles (called acrorhagi) have white tips.
Pale body column with red spots along the entire length, tentacles
grey with a reddish cast.
Chek Jawa, Oct 04
Chek Jawa, Mar 05
Chek Jawa, Mar 05
Punggol, Jun 12
St. John's Island
Changi, Oct 09
Often found in crevices on large rocks.
are difficult to positively identify without close examination.
On this website, they are grouped by external features for convenience
bead anemones on Singapore shores
Sembawang, Dec 09
Photo shared by Loh Kok Sheng on flickr.
Pulau Ubin OBS, Jan 16
Photo shared by Lisa Lim on facebook.
Pulau Tekukor, Jan 10
Photo shared by James Koh on his