talking points for nature guides
echinoderms text index | photo index
Phylum Echinodermata
Photo index of echinoderms on Singapore shores

Arms many, long feathery
feather stars
Arms five, long bristley
brittle stars
Arms 5-8, short

small <10cm

large
> 10cm
Hard flat, coin-like
sand dollars
Hard spherical, spiny
sea urchins, heart urchins
Soft round or long
sea cucumbers
short <10cm
Soft round or long
sea cucumbers
long >10cm

These are NOT echinoderms

Sea anemone
Phylum Cnidaria

Fanworms
Phylum Annelida

Peacock anemone
Phylum Cnidaria

Flowery sea pen
Phylum Cnidaria

Peanut worm
Phylum Spincula

how to tell apart
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photo index of
echinoderms on this site
Phylum Echinodermata
all echinoderms

With arms

  many, feathery
feather stars

five, bristley
brittle stars

sea stars
small <10cm
large >10cm

Hard
  flat, coin-like
sand dollars

spherical, spiny
sea urchins
heart urchins

Soft

  sea cucumbers
short <10cm
long >10cm
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