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| | Arthropoda |
 | | They live in water, although the water may be the moisture held between the leaves of a moss, and they are capable of producing a thick-walled, protective resting cyst and surviving long periods of dessication (and, apparently, immersion in alcohol, freezing, boiling, vacuum and irradiation; Tudge 2000, p. |
 | | The group comprises three classes: Heterotardigrada, Eutardigrada, and Mesotardigrada. |
 | | For discussion and references, see Dewel and Dewel 1997. |
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