Caenogastropods occur in almost every habitat found on Earth. Most are found in the marine environment, where they extend from the high tide mark to the deepest oceans; several groups live in freshwater or terrestrial habitats. In the terrestrial realm, caneogastropods can be found in the wettest en vironments of tropical rainforests and in the driest deserts, where annual activity patterns may be measured in hours. Some of the smallest caenogastropods live below ground in the lightless world of aquifers and caves, and others intersti-tially in groundwater. Marine diversity is highest near shore and becomes reduced as depth increases beyond the shelf slope. Like many other organisms, caenogastropods reach their highest diversity in the tropical western Pacific and decrease in diversity toward the poles.
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