Jan Hamrsky / Mosquito (Culex pipiens) larva below its pupa case. Europe, August.

Rolf Nussbaumer / Black sympetrum dragonfly emerging from larval case {Sympetrum danae} Switzerland

Jan Hamrsky / Case-building caddisfly pupa(Trichoptera) developing inside of its case attached to a stone at the bottom, underwater, Europe, June, controlled conditions

Jan Hamrsky / Caddisfly pupa (Trichoptera) inside its protective case attached to a stone, Europe, May. Controlled conditions.

Rod Williams / Harlequin ladybird (Harmonia axyridis) adult beside pupa case, South London, UK, August

Adrian Davies / Cicada (Cicadetta sp) empty pupa case on tree trunk, Crete, Greece.

Willem Kolvoort / Dragonfly (Aeshna genus) newly emerged from larval case, pumping and drying wings, Holland

Nigel Cattlin / Asian rice gall midge (Orseolia oryza) hatched pupal case emerged from a Rice (Oryza sativa) stem, Luzon, Philippines