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| Image: Matthew Hooge |
Molluscs range from mussels who sit around in their shell all day doing nothing, to active, wide-eyed, predatory squid. Arthropods can have 6 legs, 8 legs or several hundred legs. Chordates can have lungs and a backbone, no lungs and a backbone or no lungs and no backbone either.
These are among the most famous and diverse of the
animal phyla; splendidly bountiful branches of the tree of life. But let's not allow their mind-boggling variety cause us to overlook the more stark branches with their tiny animal life that barely anyone has ever heard of.