I haven’t been inspired recently, so all I have is a picture of one of the more aquatic creatures of Felinae.
The sirans are the most human-like of the Merish. They have webbed hands and feet, and their eyes are opaque, with no irises showing. They, of all the Merish, are seen the most, for they inhabit the topmost part of the water and dwell within underwater caves close to the surface. Edit: There are both male and female sirans.