Oulema obscura (Oulema obscura)

Oulema obscura - Development Top row: This little larva had just shortly before shed its skin with poo-camouflage (top left) and was beginning to build up a new camouflage slime layer with excrements.
Bottom row: Before pupating, it sheds its slimy skin with excrements one last time and spins a somewhat sponge-like cocoon. About two weeks later the beetle emerges.
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Appearance

This is one of the all blackish-blue Oulema spp. (some other species have a red pronotum).

Oulema obscura Chrysomelidae,Criocerinae,Oulema,Oulema obscura

Naming

Oulema obscura (Stephens) and the also completely blue Lema cyanella (Linnaeus) have a confusing naming history. In the British keys by Joy Oulema obscura is featured misnamed as Lema cyanella, whereas the true Lema cyanella is sported as Lema puncticollis Curtis.

References:

Some text fragments are auto parsed from Wikipedia.

Taxonomy
Kingdom	Animalia
Division	Arthropoda
Class	Insecta
Order	Coleoptera
Family	Chrysomelidae
Genus	Oulema
Species	Oulema obscura

Photographed in
Netherlands