Baeus seminulum, which has no common name, is a species of parasitic wasp found in western Europe.

[3] The male's wings are narrow and feature long marginal setae, with the longest marginal setae nearly as long as the maximum wing width.

[3] The first and second abdominal tergites (T1 and T2) are characterized by numerous closely spaced ridges on T2.

[2] B. seminulum is found in western Europe, notably France, Sweden, the United Kingdom, Finland, and Ukraine.

[5] The species has also been recorded from several other European countries: Austria, Belgium, Denmark, Germany, Italy, Russia, and Portugal.