subaqueous

Those compact bones can aid such transitional creatures, which might not yet have features like fins or flippers to help them maneuver in the water more easily, in hunting underwater — what the team calls “subaqueous foraging.”

That suggests that both of these dinos were subaqueous foragers, the team says.

Once, indeed, the raft grounded upon a subaqueous reef, and threatened going to pieces.

The shadow of the house had swung over it, and in the gathering dusk the flower-beds glowed with a dim subaqueous radiance.