Adults are about 26–32 mm long.
Fine-art photographic collection
Euchroea coelestis
A Madagascan flower chafer whose blue bands are built into the surface of its armour rather than painted onto it.
About this species
Euchroea coelestisBurmeister, 1842
Information reviewed15 July 2026
Euchroea coelestis is a large endemic flower chafer from Madagascar. Adults are dark with luminous blue striping, while the hidden grub stage develops in decaying organic material before constructing a pupal cell.
Taxonomy
Animalia · Arthropoda · Insecta · Coleoptera · Scarabaeidae · Cetoniinae · Euchroea
Accepted taxon. · checked 2026-07-15
MadagascarBroad range and selected reference localities — not a complete occurrence map.
Madagascar
Humid forest and forest edge with decaying wood, fruit and flowers.
Adults are active in warm daylight and visit sap, fruit and flowers.
Sugary plant fluids as adults; decomposing organic material as larvae.
Solitary.
What makes this species remarkable?
The electric blue markings are structural: microscopic layers and surface architecture manipulate reflected light, producing brilliance that does not depend on ordinary blue pigment.
The adult is the brief visible phase of a much longer transformation; the larva spends months hidden in rotting material, then seals itself inside a hardened cell and rebuilds its body completely.
Euchroea is a Madagascan radiation, so this celestial-looking beetle is part of an evolutionary experiment that unfolded on one island and nowhere else on Earth.