|Stonefly emergence sites are obvious on bridge abutments |
but if you look closely at larger rocks and tree trunks along the stream
you will be surprised at the number of shed exuvia that are present.
|There are four species of stonefly exuvia here - all emerging at the same time of year.|
|The white filaments are the linings of the tracheal respiratory system that are shed along with the exoskeleton.|