10cm. A pair of slots in the body margin. Flower-like petalloid obvious
even in living specimens. Usually alone in sandy areas near seagrasses.
Sometimes seen on our Northern shores.
2-8cm. No holes in the body, star-shaped petalloid not obvious in
living specimens. In large groups in sandy areas near seagrasses.
Seen on many of our sandy shores in the north and south.
Rather pentagonal, thick at the edges and at the centre. Petalloid
obvious. Longer spines at the edges of the body. Pale rose pink or
grey. Silty sand near reefs. Sometimes seen on some of our shores.
Circular. Petalloid obvious. Bright pink. In sandy lagoon. Sometimes
seen at Pulau Sekudu and Changi.