Aprostocetus sensuna is a species of chalcid wasp

Chalcid wasp

Chalcid wasps belong to the insect order Hymenoptera, and are one of the largest groups within the order, with some 22,000 known species, and an estimated total diversity of anywhere from 60,000 to more than 500,000 species, meaning the vast majority have yet to be discovered and described.Most of...

 belonging to the family Eulophidae

Eulophidae

Eulophidae is a large family of hymenopteran insects, with over 4,300 described species in some 300 genera . The family as presently defined also includes the genus Elasmus, which was previously treated as a separate family, "Elasmidae", and is now treated as a subfamily of Eulophidae...

. It is only known from close to the Sense River

Sense River

The Sense River is a right tributary of the river Saane in Switzerland. It is a border river between the Cantons of Fribourg and the Berne. Its source rivers, the Kalte Sense, coming from Mount Gantrisch, and Warme Sense, flowing out of lake Schwarzsee, join at Zollhaus and thus form the origin of...

 near Bern in Switzerland

Switzerland

Switzerland name of one of the Swiss cantons. ; ; ; or ), in its full name the Swiss Confederation , is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe,Or Central Europe depending on the definition....

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Up to 2.25 mm in length, this species can be distinguished from its nearest congeners by its generally black, non-metallic body coloration and long, prominent hypopygium (process at end of abdomen). The specific name sensuna is taken from the ancient name of the river where it was first recorded.

The breeding ecology of the species is unknown.