Photos of a striking, iridescent wasp posted on social media by wasp enthusiasts in Japan have led to an unexpected discovery: The images are the first record of the species in Japan. The footage also helped scientists describe a male of the species for the first time.
The images and a video of the wasps were posted by two citizen scientists on Twitter (now X) in 2018 and 2021. The video showed a female wasp depositing her eggs onto a hard egg case of a praying mantis.
Taisuke Kawano, a wasp expert at the Kyushu University Museum, Japan, noticed the footage and contacted the wasp enthusiasts who then sent him a few specimens of the wasp. The citizen scientists are also co-authors of a study, published in June, that details the scientists’ findings.
Kawano and his colleagues identified the wasp as Eupelmus curvator. It’s a parasitoid wasp that lays its eggs in the egg cases of mantises. The larvae of the wasps feed on the mantis eggs as they develop.
The researchers said the photos posted on social media are the first known record of Eupelmus curvator in Japan. The species was previously known only from China.
