Eutrichosomatidae is a family of parasatoid chalcid wasps. Their bodies are black or metallic, with some species being covered in white hairs. The genera Eutrichosoma and Peckania are distributed across the New World while Collessina is only found in Australia. The genera Peckanius and Collessina are named after Dr Oswald Peck and D.H Colless respectively. Both genera contain one species each while Eutrichosoma contains 3.