hygropetric

hygro- +‎ -petric from Ancient Greek πέτρος (pétros, “stone”).

hygropetric (not comparable)

1. (zoology) Requiring a habitat of a thin layer of water covering a rock surface.
   • 1919, Charles Paul Alexander, The Crane-flies of New York‎:

     In Europe, Dicranomyia trinotata (Meig.) is a characteristic member of the hygropetric association, the insects living on rocks in streams, where they are covered with a thin sheet of water and are usually associated with such insect forms as Beraea, Tinodes, Stactobia (Trichoptera), Orphnephila testacea (Ruthe), Pericoma nubila (Meig.), Dixa maculata Meig., Oxycera pulchella Meig., and other Diptera.

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