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Velcro
crab
Camposcia retusa
Family Inachidae
updated
May 09
if you
learn only 3 things about them ...
They attach living sponges and seaweeds as a disguise.
The disguise continues to grow and other animals live
on it.
They
tend to move slowly. |
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Where
seen? This superbly disguised crab is commonly
encountered on our Northern shores, on coral rubble and seagrasse
areas. But it requires a keen eye to spot!
Features:
Body width 3-6cm. Body tear-drop shaped with a pointed head. Often
all you can see is its tiny eyes and very short antennae.
This crab snips off bits of sponges and seaweed or selects suitable
shells and debris. These are then stuck firmly onto the fine, hooked
hairs which densely cover its body and legs and thus act like the
'velcro' after which it is named. Some
seem to stick on a protruding 'head gear' on their heads.
These 'decorations' not only camouflage the crab, but the distasteful
nature of some sponges might also give predators second thoughts about
taking a bite out of the crab. The
attached sponges and algae often continue to grow. Tiny animals might
settle on the sponges.
What
does it eat? Relying on its disguise, the crab moves slowly,
feeding on small creatures. Its dainty narrow feeding pincers are
often the only parts of its body left unadorned.
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Upperside
Chek Jawa, Aug 05

Some have a protruding 'head gear'
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| Status
and threats: This crab is listed as 'Vulnerable'
on the Red List of threatened animals of Singapore. It is popular
in the aquarium trade and the Singapore Red Data Book states
that its collection from Singapore should be controlled or stopped. |
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Underside
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Pincers are undecorated.
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Velcro
crabs on Singapore shores

Chek Jawa, Jul 03
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Chek Jawa, Jun 06
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Chek Jawa, Jun 03
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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. (Online
PDF on the Raffles Bulletin of Zoology website)
- Lim, S.,
P. Ng, L. Tan, & W. Y. Chin, 1994. Rhythm of the Sea: The Life
and Times of Labrador Beach. Division of Biology, School of
Science, Nanyang Technological University & Department of Zoology,
the National University of Singapore. 160 pp.
- Davison,
G.W. H. and P. K. L. Ng and Ho Hua Chew, 2008. The Singapore
Red Data Book: Threatened plants and animals of Singapore.
Nature Society (Singapore). 285 pp.
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