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Number of species (from various families) found in surface (blue bars) vs. underground (red bars) habitats:1–Nerillidae, 2–Parergodrilidae, 3–Potamodrilidae, 4–Propappidae, 5–Haplotaxidae, 6–Lumbriculidae, 7–Erpobdellidae, 8–Aeolosomatidae, 9–Glossiphoniidae, 10–Lumbricidae, 11–Tubificidae, 12–Naididae, 13–Enchytraeidae.
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