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For more than a decade, Cynthia Kenyon of the University of California, San Francisco, has been making these microscopic worms, called “C. elegans” live far longer than believed wormly possible.
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Hi Enkidu

The writer means "possible for a worm".

There is a commonly used expression "humanly possible" (i.e. possible for a human), and the writer was creatively using the same format to talk about worms here.
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Do worms send each other their wormest regards?
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Hi, Enkidu. Are you sure in ""wormly"? My dictionary refuses to find it.
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khoffDo worms send each other their wormest regards?
Of course! Whenever wormly possible. Emotion: stick out tongue
This thread is becoming very wormisome.

CJ