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africa
shallow waters
radial symmetry
radiating
relative of starfish
sands
sea grass
seashore
seashores
sedentary
shallow seas
short spined sea urchin
protection
slow moving
spiny skin
spots. coral reef
suckers
tanzania
temperate seas
tripneustes gratilla
tropical
vegetarian
venom
radial bands
painful
algae
five rows
ancient
anus on top
camouflage
coast
detritus
diving
domed
echinodermata
echinoidae
empty case
hollow spines
mouth underneath
hydraulics
indo pacific
inter-tidal
invertebrate
iridiphores
irritant
littoral
low tide
lower shore
marine
zanzibar

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