|Queen Butterfly Pupa|
One interesting feature of both Monarch and Queen butterfly pupa is the gold stripes and spots, evident in both photos here. As far as I've been able to research, there are no clear conclusions as to why these gold spots exist. The color is not a pigment, but rather iridescence. One study I found reference to believes that these spots somehow tie to scale production and coloration of the butterfly. If anyone has better information please post a comment!
|Queen Butterfly Pupa - close-up of gold iridescence|