A new species of Calogalesus Kieffer, 1912 (Hymenoptera: Diapriidae: Diapriinae) from Japan, with a key to world species

The genus Calogalesus Kieffer, 1912 is newly recorded from Japan. Calogalesus matris sp. nov. is described as new to science based on specimens from the Ogasawara Islands and Okinawa Island, Japan. A taxonomic key to world species of Calogalesus is presented. New DNA barcodes allowed the recognition of size-related morphological variation.