This black sea urchin with short spines is commonly seen on some of
our Northern shores. Large heaps of many individuals are sometimes
seen. At other times, there are none to be seen. Sandy areas near
seagrasses as well as coral rubble and rocky shores and under jetties.
Features: Body diameter 4-5cm,
sometimes tiny ones about 1cm in diameter are seen among seaweeds.
Short slender spines (1-2cm) with long translucent tube feet that
may extend past the spines. The spines on the upperside are black
and pointed. Spines on the underside are flattened and may be banded.
Some have obvious light-coloured zig-zag lines radiating from the
centre around the body. The sea urchin appears to 'carry' shells and
other debris. This behaviour may help camouflage it or shield it from
May be confused with the Long-spined
black sea urchin (Diadema sp.) which has much longer spines
and is not often seen on the Northern shores.
Prickly Home: Often, a large fat
banded worm-like animal is seen curled around the mouth of the sea
Sometimes found in large groups.
Changi, Jul 04
Changi, May 05