The Cryptostomata are also Palaeozoic, and include the abundant and widely-distributed genus Fenestella.
It is significant that in India the widely-distributed Nagapancami-festival occurs in the rainy season.
A terrestrial habitat is less common, but the widely-distributed land Isopoda or woodlice and the land-crabs of tropical regions have solved the problem of adaptation to a subaerial life.
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