seen? Only the odd movement of coral rubble gives away
the presence of this little hairy crab that carries around a piece
of rubble. It lives on rubble and reefs. Elsewhere, the crab has been
seen to carry live and dead corals weighing up to 1kg! The crab has
also been observed to excavate holes in fixed and immobile live or
dead corals, soft stones or sponges.
Features: Body width 2-3cm. Body
oval, body and legs covered with velvety hairs, but is not as hairy
as the Common hairy crab. It has stout
pincers, one larger than the other, both covered in bead-like bumps.
If the piece of coral is overturned, the crab will turn it back the
right way and scuttle back into its hiding place. The crab moves around
by holding the rubble with its back legs and pushing agains the ground
with its pincers.
Crab castle: Inside the rubble,
the crab excavates a castle! Besides the entrance on the underside
of the rubble is a feeding chamber, leading up via a tunnel to a place
for it live, and with 8-12 small openings to the outside of the rubble
probably used by the crab to detect food.
Chek Jawa, Jul 13
Jawa, Jul 13
Cyrene Reef, Jul 12
Photo shared by Marcus Ng on his
Cyrene Reef, Jun 12
Jawa, Jul 13
hairy crabs on Singapore shores
Pulau Tekukor, Jun 16
Photo shared by Loh Kok Sheng on facebook.
|1 Jun 2013
Video clip shared
by Marcus Ng on his
P.R., Davie, P.J.F., Neil, D.T. & Fellegara, I. Excavation,
habitation and transportation of massive corals by the crab Actumnus
setifer (Crustacea: Brachyura: Pilumnidae) in Moreton Bay,
Queensland. Memoirs of the Queensland Museum 54 (1)
- 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.