1. Some members of the classes Asteroidea, Echinoidea and Holothuroidea are poisonous and can cause serious injuries to humans.
2. Some echinoderm-like fossils have been suspected of being chordates.
3. In the past, scientists once thought there was a sixth class of echinoderms called the Concentricycloidea.
4. Each skeletal element of echinoderms are actually a finely branched cystal of calcium carbonate.
5. The biggest cucumbers can grow to 2 m high.
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