Spotted
moon crab
Ashtoret lunaris
Family Matutidae
updated
Dec 2019
Where
seen? This spotted moon crab is commonly encountered on
our shores. Sandy silty shores, especially near seagrasses. It is
more active at night and is rarely seen by daytime visitors as it
is then often buried in the sediments. 'Lunaris' in Latin refers to
the moon.
Features: Body width 3-8cm. Body rather circular, with a pair of
long spikes on the sides. There are six large smooth bumps in the
middle of the body, the bumps are sometimes but not always highlighted
by body patterns. Colours beige to yellow with little maroon dots
evenly sprinkled on the body surface, sometimes highlighting the six
bumps. Pincers short, sturdy, held against the body to form a somewhat
box-like shape. All walking legs end in paddle-shaped tips and used
to skim along the sea bottom and also like spades to rapidly burrow
into the sand. Some may have large dark blotches on the paddles, with
smaller dark spots on the legs. |
Changi, Apr 05
|
Underside.
Changi, Apr
10
|
Sisters Island, Oct 06
|
Spotted
moon crabs on Singapore shores |
Other sightings on Singapore shores |
Punggol, Jan 13
Photos
shared by Loh Kok Sheng on his
blog. |
|
Sentosa Serapong, May 24
Photos
shared by Ng Leekiang on facebook. |
St. John's Island, Jul 09
Photos
shared by Geraldine Lee on her
blog. |
St. John's Island, Oct 20
Photos
shared by Jianlin Liu on facebook. |
With eggs.
St. John's Island, Feb 24
Photos
shared by Marcus Ng on facebook. |
Pulau Hantu, Oct 24
Photo
shared by James Koh on facebook. |
Cyrene Reef, May 11
Photo
shared by Marcus Ng on flickr. |
Cyrene Reef, Feb 16
Photos
shared by Juria Toramae on facebook. |
Cyrene Reef, Jun 10
Photos
shared by Loh Kok Sheng on his
flickr. |
Cyrene Reef, May 11
Photo
shared by Marcus Ng on flickr. |
|
Pulau Semakau South, Jul 15
Photo
shared by Jianlin Liu on facebook. |
Beting Bemban Besar, Jun 21
Photo
shared by Richard Kuah on facebook. |
|
Acknowledgements
With
grateful thanks to Ondrej Radosta for identification help with these crabs..
Links
References
- Ng, Peter
K. L. and Daniele Guinot and Peter J. F. Davie, 2008. Systema
Brachyurorum: Part 1. An annotated checklist of extant Brachyuran
crabs of the world. The Raffles Bulletin of Zoology. Supplement
No. 17, 31 Jan 2008. 286 pp.
- Jones Diana
S. and Gary J. Morgan, 2002. A Field Guide to Crustaceans of
Australian Waters. Reed New Holland. 224 pp.
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