Phylum Echinodermata - thegreenisle.wikispaces.comthegreenisle.wikispaces.com/file/view/Phylum+Echinodermata.pdf... · All echinoderms are marine organisms ... locomotion and getting
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Phylum Echinodermata
Echinodermata
All echinoderms are marine organisms
7,000+ species
Ex: starfish, sea urchins, sea cucumbers
and sand dollars.
Starfish
Sea urchins
Sea cucumbers
Sand dollars
Characteristics
Most exhibit pentamerous radial symmetry (can be divided into 5 equal parts from a central axis)
During development, they go through bipinnaria larva stage (bilateral symmetry – suggests evolution from a bilateral symmetrical ancestor)
Have tube feet with suction disks used in locomotion and getting food.