The Moorland Clouded Yellow , Palaeno Sulphur , or Pale Arctic Clouded Yellow ( `` Colias palaeno '' ) is a Holarctic butterfly in the family Pieridae .
The Colias palaeno ( also known as Moorland Clouded Yellow , Palaeno Sulphur , or Pale Arctic Clouded Yellow ) is a butterfly in the family Pieridae .