Are Actaea and Nymphoides both aquatic plants?
Actaea (plant) Actaea, commonly called baneberry, bugbane and cohosh, is a genus of flowering plants belonging to the family Ranunculaceae, native to subtropical, temperate and subartic regions of the Europe, Asia and North America.
Nybyoceras Nybyoceras is an actinocerid genus assigned to the Armenoceratidae and similar to "Armenoceras" except for having a siphuncle close to the ventral side of the shell.