seen? These crabs really do resemble tiny pebbles and are
sometimes seen on our Northern shores. Silty, sandy areas near seagrasses.
They are usually buried under the sand.
Features: Body width 1-2cm. Body
smooth somewhat rhomboid, indeed resembling a tiny pebble. The head
forms a blunt pointed tip with a pair of tiny eyes. In this way, its
eyes can peep out while the rest of the crab is buried underground.
It has powerful long flat pincers with pointed claws. The crab can
bury itself in the sand very rapidly. Some may be colourful.
According to the Singapore Red Data Book, the Rubble crab (Favus
granulatus) is known only from Singapore and was a new genus and
species discovered from Singapore and is not yet known elsewhere.
It was found on Siloso Beach of Sentosa which has since been 'improved',
and Pulau Semakau. Alox somphos, a related species in another
genus was also first described from Singapore.
Status and threats: Some of our
pebble crabs are listed as 'Endangered' on the Red List of threatened
animals of Singapore.
Like other creatures of the intertidal zone, they are affected by
human activities such as reclamation and pollution. Trampling by careless
visitors also have an impact on local populations.
Changi, Apr 08
Pulau Semakau, Mar 08
Photo shared by Loh Kok Sheng on
Chek Jawa, Jan 02
Mating pebble crabs
Changi, Jul 05
crabs on Singapore shores
Changi, Jul 08
Changi, May 12
Changi, Jul 12
Changi, Jun 13
Photo shared by Loh Kok Sheng on flickr.
Tanah Merah Ferry Terminal, Jun 15
Photo shared by Heng Pei Yan on facebook.
St John's Island, May 09
Photo shared by Loh Kok Sheng on his blog.
Leucosiidae recorded for Singapore
Wee Y.C. and Peter K. L. Ng. 1994. A First Look at Biodiversity
in red are those listed among the threatened
animals of Singapore from 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.
somphos (EN: Endangered)
Ebalia malefactrix=^Philyra malefactrix (Mangrove pebble crab)
Favus granulatus (Rubble crab)
Heteronucia aff. mesenensis
Ixa cylindra=^Ixa cylindrus
Oreophorus rugosus=^Alox rugosum
Philyra heteograna=^Lyphira heterograna
Praosia punctata (EN: Endangered)