Coarctate pupae develop inside the larval skin.

When he analyzed the summer's collection that fall, he determined from the wingpads on the larval skin and elongated oval abdomen that the insect was a snaketail.

It begins in Central Europe, where the Körös River plays host to millions of giant mayflies as they rise from their larval skins to mate.

During this time, the larval skin which was initially milky white actually shrinks and hardens to form a dark brown puparium.

After feeding on the bug's tissues, the cream-coloured larva emerges and falls to the ground where it pupates in a reddish-brown puparium formed from the last larval skin.

They also help them shed their larval skin.

Signs of an infestation include the presence of damaged articles, molted larval skins in dark areas, and an abundance of adult beetles near windows.

The cast pupal cases and larval skins were also found to contain amitriptyline and nortriptyline.

The use of pupal cases and larval skins allows for investigators to detect toxins in a body years after death.