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Magnificent
anemone
Heteractis magnifica
Family Stichodactylidae
updated Nov 2019
if you
learn only 3 things about them ...
They are found among the coral rubble. Don't step on them!
Don't remove any fishes or shrimps that live in the anemone. They will die and the anemone will also suffer.
Don't
poke the anemone to try to make fishes or shrimps come out.
They will instead hide deeper in the anemone. |
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Where
seen? This stunning, large anemone is well named. It is
seen on our Southern shores, attached to large boulders of dead coral or other solid objects. It is rarely buried in sand or sediments. Several
of these anemones may be found next to one another. The
anemone was previously known as Radianthus ritteri.
Features: Diameter
when expanded 30-50cm, but can reach 1m. Body column uniformly coloured. Those seen were white, pink, maroon,
purple. The body column has longitudinal rows of translucent verrucae
of the same colour or slightly lighter or darker than the body column.
Long tentacles (5-8cm) densely cover the oral disk. The tentacles
are finger-like and do not taper. The tips are blunt or slightly swollen.
The lower part of the tentacles are usually the same colour as the
oral disk. Tips may be yellow, green or white. It is said that the
mouth area of 2-3cm in the centre of the oral disk is usually yellow,
brown or green and the mouth
is often raised so it sits on a cone. But
this has not been observed for those seen at low tide. The animal
can tuck all its tentacles into its body column, forming a ball-shape
with only tufts of tentacles sticking out in the centre.
Sometimes confused with other
large sea anemones and similar large cnidarians. Here's more on how
to tell apart large
sea anemones with long tentacles and large
'hairy' cnidarians.
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The animal can tuck its tentacles
into its body.
Kusu Island, May 04 |
Long tentacles densely cover the oral disk. |
Sea anemone in the process of cloning itself!
Pulau Hantu, Jul 20
Photo shared by Dayna Cheah on facebook. |
Pulau Hantu, Jan 10
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Pulau Hantu, Feb 08
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Terumbu Pempang Tengah, Apr 12
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Magnificent friends: The
Magnificent anemone harbours symbiotic algae (called zooxanthellae)
that photosynthesize. The algae share the food produced with the anemone,
which in turn provides the algae with shelter and minerals.
Several kinds of animals may live happily among and unharmed by the
tentacles of the Magnificent anemone. These include Anemone
shrimps like the Peacock-anemone
anemone shrimp (Periclimenes brevicarpalis) and fishes
such as Dascyllus trimaculatus and anemonefishes including A. akallopisos, A. bicinctus, A. clarkii, A. nigripes, A. ocellaris (Clown anemonefish), A. percula, A. perideraion, A. xanthurus.
Status and threats: Magnificent
anemones are not listed among the endangered animals of Singapore.
However, like other creatures of the intertidal zone, they are affected
by human activities such as reclamation and pollution. Trampling by
careless visitors, and over-collection also have an impact on local
populations. |
A small fish caught in its tentacles.
Kusu Island, Dec 18
Photo shared by Loh Kok Sheng on facebook. |
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Magnificent
anemones on Singapore shores |
Other sightings on Singapore shores |
St. John's
Island , Apr 12
Photo shared by Loh Kok Sheng on his
blog. |
Pulau Jong, Jun 12
Photo shared by Loh Kok Sheng on his
blog. |
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Terumbu Bemban, Jul 11
Photo shared by James Koh on his
blog. |
Terumbu Raya, Jun 20
Photo
shared by Jianlin Liu on facebook. |
Terumbu Pempang
Darat, Jun 10
Photo
shared by James Koh on his
blog. |
Pulau Senang, Jun 10
Photo shared by Loh Kok Sheng on his
flickr. |
Pulau Senang, Jun 10
Photo shared by Loh Kok Sheng on his
flickr. |
Pulau Pawai, Dec 09
Photo shared by James Koh on his
flickr. |
Pulau Salu, Apr 21
Photo shared by Loh Kok Sheng on facebook. |
Pulau Berkas, Feb 22
Photo shared by Loh Kok Sheng on facebook. |
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Links
References
- Daphne Gail Fautin, S. H. Tan and Ria Tan. Dec 2009. Sea anemones
(Cnidaria: Actiniaria) of Singapore: abundant and well-known shallow-water
species. The Raffles Bulletin of Zoology. Pp. 121-143.
- Erhardt,
Harry and Daniel Knop. 2005. Corals:
Indo-Pacific Field Guide
IKAN-Unterwasserachiv, Frankfurt. 305 pp.
- Gosliner,
Terrence M., David W. Behrens and Gary C. Williams. 1996. Coral
Reef Animals of the Indo-Pacific: Animal life from Africa to Hawaii
exclusive of the vertebrates
Sea Challengers. 314pp.
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