| Salmacis sea urchins
seen? This almost-cuddly white sea urchin
is seasonally common on our Northern shores among seagrasses. At some
times, many of these sea urchins are seen, and then none seen for
some time. On Cyrene Reef, gatherings of many of these sea urchins
are sometimes seen.
Features: Body diameter 5-8cm, with
tiny sharp spines. It has long tube feet and is often seen carrying
all kinds of things from shells to seaweeds. It can quickly gather
these things to cover itself. This behaviour may help camouflage it
or shield it from sunlight.
What does it eat? It eats seaweeds.
Wormy mouth: Sometimes, a worm-like creature is found curled around the mouth of
the White sea urchin. Examination of tests (skeleton of a dead sea
urchin) suggest that large snails might prey on them.
in large numbers.
Cyrene Reef, Apr 07
Hole with 'burn'
mark suggests the urchin
was attacked by a Helmet
Changi, May 08
seen on the underside.
Changi, Oct 10
Beting Bronok, May 06
sea urchins on Singapore shores
Spines shorter, mostly white,
banded with green or maroon.
species recorded for Singapore
Y.C. and Peter K. L. Ng. 1994. A First Look at Biodiversity in
Grateful thanks to Dr Frederic Ducarme for identifying these sea urchins.