Velcro
crab
Camposcia retusa
Family Inachidae
updated
Dec 2019
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, without large spines on the
sides. Often all you can see are its tiny eyes on long curved eyestalks
at the tip of its pointed head. Pincers short cylindrical, claws slender
and curving. |
Upperside
Chek Jawa, Aug 05 |
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Underside.
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Pincers are undecorated.
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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.
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. |
Pulau Sekudu, Jul 08
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Chek Jawa, Jul 03
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Chek Jawa, Jun 03
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Upside down crab (showing its small undecorated pincers) righting itself. Changi, Dec 17 |
|
Pulau Sekudu, Aug 24 |
Velcro
crabs on Singapore shores |
Other sightings on Singapore shores |
Sembawang, Oct 20
Photo shared by Vincent Choo on facebook. |
|
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Pulau Ubin, Dec 17
Photo shared by Abel Yeo on facebook. |
Beting Bronok, Jun 18 |
Photo shared by Loh Kok Sheng on facebook. |
Tuas, Oct 12
Photo shared by Loh Kok Sheng on flickr. |
East Coast Park, Apr 17
Photo shared by Loh Kok Sheng on facebook. |
East Coast Park-Marina East, May 22
Photo shared by Kelvin Yong on facebook. |
Sentosa, Apr 13
Photo shared by Marcus Ng on flickr. |
Seringat Kias, Aug 12
Photo shared by Loh Kok Sheng on his blog. |
|
Little Sisters Island, Jul 17
Photo shared by Jianlin Liu on facebook. |
Sisters Island, Dec 10
Photo shared by Loh Kok Sheng on his
blog. |
Sisters Island, Jan 11
Photo shared by Loh Kok Sheng on his
blog. |
St. John's Island, Jul 10
Photo shared by Toh Chay Hoon on her
blog. |
St. John's Island, Sep 07
Photo shared by Loh Kok Sheng on his
blog. |
St. John's Island, Sep 07
Photo shared by Marcus Ng on flickr. |
Pulau Tekukor, May 10
Photo shared by James Koh on flickr. |
Pulau Hantu, Apr 12
Photo shared by Marcus Ng on flickr. |
Terumbu Raya, Jul 14
Photo shared by Heng Pei Yan on flickr. |
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.
- 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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