New Beetle Species Discovered in Japan: Acicnemis ryukyuana

New Beetle Species Discovered in Japan: Acicnemis ryukyuana

In Japan’s Ryukyu Islands, scientists from the OIST (Okinawan Institute of Science and Technology) have discovered an unknown insect species, which has been identified as Acicnemis ryukyuana.1

Led by the esteemed entomologist Dr. Jake H. Lewis, the OIST team has dedicated years of meticulous research to studying the insect populations inhabiting Okinawa Island. Using a strategic network of traps, they have successfully procured a wide range o creatures, including beetles, flies, and bees. These specimens have been carefully preserved in ethanol and are now housed within the prestigious OIST insect collection. Amidst their efforts, Dr. Lewis stumbled upon a beetle species that immediately caught his attention.

Upon closer examination, Dr. Lewis observed distinct characteristics in this particular beetle, now known as Acicnemis ryukyuana, that set it apart from other species found in East Asia. While belonging to the Acicnemis genus, it displays elongated scales and distinctive pigmentation that distinguish it from its counterparts.

The defining features of Acicnemis ryukyuana are truly remarkable. It is characterized by striking yellow bands adorning its shoulders, and its robust forewings showcase a mesmerizing pattern of gray, black, and yellow scales. Further scrutiny under the microscope unveiled additional extraordinary traits, including the presence of long scales or hairs covering its body and legs.

A: Acicnemis ryukyuana, B: Acicnemis postica,
C: Acicnemis azumai, D: Acicnemis exilis,
E: Acicnemis maculaalba, F: Acicnemis kiotoensis
Photo: Okinawan Institute of Science and Technology

Interestingly, the research team noticed that Acicnemis ryukyuana displayed a heightened sensitivity to human presence. Despite scattering insect traps across Okinawa Island, even in densely populated areas, the species exclusively emerged within the protected confines of Yanbaru National Park. Additionally, these intriguing beetles were found thriving in virgin subtropical forest regions on the island of Ishigaki.

The scarce appearance of Acicnemis ryukyuana in the traps suggests that this species may be exceptionally rare. Its exclusive occurrence in pristine, densely forested realms emphasizes its preference for undisturbed habitats. This heightened sensitivity to human interference sets Acicnemis ryukyuana apart from other Acicnemis species commonly encountered throughout the Ryukyu Islands.

Dr. Lewis’s ongoing research efforts aim to uncover further insights into the ecology and evolutionary history of Acicnemis ryukyuana. He also intends to delve into the broader spectrum of insect diversity and explore the enigmatic wonders concealed within the enchanting forests of the Ryukyu Islands. As scientists continue to unravel the secrets of these captivating islands, it becomes increasingly clear that they hold an abundance of undiscovered and remarkable species, waiting to be explored and documented.

Acicnemis ryukyuana: A Symbol of the Rich Biodiversity of Japan’s Subtropical Islands

The revelation of Acicnemis ryukyuana adds to the ever-expanding catalog of extraordinary, undocumented species that inhabit Japan’s subtropical islands. With its distinctive yellow shoulder bands, this beetle serves as compelling evidence of the astonishing biodiversity thriving within the mystical Ryukyu Islands.

The Ryukyu Islands have long been revered as a hotbed of biodiversity, thanks to their unique geographical location and varied ecosystems. These islands stretch southwest from mainland Japan towards Taiwan and harbor a rich array of flora and fauna found nowhere else in the world. Researchers and nature enthusiasts are attracted to their lush forests, vibrant coral reefs, and intriguing cave systems, all of which provide ideal habitats for diverse species to thrive.

Dr. Lewis and his team’s discovery of Acicnemis ryukyuana serves as a testament to the importance of preserving these natural environments. The beetle’s sensitivity to human presence highlights the impact of human activities on fragile ecosystems. As deforestation, urbanization, and climate change continue to pose threats to biodiversity, the need for conservation efforts becomes increasingly urgent.

The findings also shed light on the significance of taxonomic research in understanding and protecting our planet’s natural heritage. By documenting and classifying species, scientists can track their distribution, study their ecological roles, and assess their conservation status. Every new species discovery brings us closer to unraveling the intricate web of life and reinforces the need for comprehensive conservation strategies.

is a genus of beetles from the family Curculionidae. Most Acicnemis species inhabit coniferous trees. They are predominantly found in East Asia (particularly Japan) and Oceania.2

  1. Japan’s subtropical forests…discovered beetle species“, Okinawan Institute of Science and Technology, June 16, 2023^
  2. Acicnemis“, Encyclopedia of Life,, Retrieved: June 18, 2023^
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