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A mature gastrotrich, with visible cells on the surface. Further growth now occurs by cell enlargement only

Eutelic organisms have a fixed number of somatic cells when they reach maturity. The exact number is constant for any one species. Development proceeds by cell division until maturity; further growth occurs by cell enlargement only.

Most eutelic organisms are small or even microscopic: examples include the nematodes like ascaris, gastrotrichs, rotifers, tardigrades and dicyemida.

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