New Species Eupelmus curvator Identified Thanks to Citizen Science
In 2018, amateur entomologist Kanji Toyosaki shared a photo on Twitter (now X) showing a tiny wasp laying eggs inside a praying mantis egg case. That image caught the eye of Japanese entomologist Taisuke Kawano, who later became the first to formally describe the male of the species Eupelmus curvator in Japan. This parasitoid wasp, previously known only in China, had never been recorded in Japan before.
The photo posted by Toyosaki captured the wasp depositing eggs into oothecae (egg cases), primarily those of the narrow-winged mantis. Research revealed that up to 77 individual wasps were found on a single ootheca in one instance. Taisuke Kawano noted that while some other genera in the family Eupelmidae are specialized egg parasitoids, most Eupelmus species target the larvae or pupae of other insects. Only a few are known to develop inside mantis egg cases, making Eupelmus curvator an unusual and biologically intriguing find.
Social Media's Growing Role in Scientific Discovery
Taisuke Kawano highlighted the increasing importance of social media for science, calling it a vital tool in citizen science. He explained that one of the biggest advantages of social platforms is their ability to put many more 'eyes in the field'—observations often come from locations and times that researchers cannot easily cover themselves.
For his contribution, Kanji Toyosaki was acknowledged as a co-author on the paper describing the new species. Around the same time, graduate student Ryota Seki described a new ladybug species, Parastethorus pinicola, which measures just over a millimeter in length. Seki spent three years meticulously dissecting 1,700 specimens under a microscope. These developments underscore the active growth of entomology in Japan and the value of collaboration between professional researchers and passionate amateurs.
The discovery of Eupelmus curvator highlights the expanding role of citizen science in entomology, where enthusiasts and experts join forces to uncover new species. It also demonstrates how modern tools like social media can broaden the scope of biological research. Cases like this may help shape new scientific directions and deepen our understanding of regional biodiversity.
As research continues to unveil new species in Japan, the recent identification of a bird species after four decades highlights the country's rich biodiversity. Such discoveries, like the recently found bird, not only showcase the importance of citizen science but also emphasize the ongoing efforts to document and understand the unique fauna of the region.