Check List 21(5): 877-883, doi: 10.15560/21.5.877

New island record and seasonal activity of Eucibdelus (Eucibdelus) ishigakiensis Hayashi, 1997 (Coleoptera, Staphylinidae, Staphylininae) from Iriomote Island, southern Japan, including notes on behavior and long-term records by an amateur naturalist

Kosei Hirai^‡, Nakatada Wachi^§, Mamoru Shoyama^|, Shu Arai^‡

‡ Tokyo University of Agriculture, Atsugi, Japan§ University of the Ryukyus, Taketomi, Japan| Unaffiliated, Taketomi, Japan

Corresponding author: Nakatada Wachi ( nwachi@cs.u-ryukyu.ac.jp )

Academic editor: Bruno Clarkson

This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Citation: Hirai K, Wachi N, Shoyama M, Arai S (2025) New island record and seasonal activity of Eucibdelus (Eucibdelus) ishigakiensis Hayashi, 1997 (Coleoptera, Staphylinidae, Staphylininae) from Iriomote Island, southern Japan, including notes on behavior and long-term records by an amateur naturalist. Check List 21(5): 877-883. https://doi.org/10.15560/21.5.877

Abstract

Eucibdelus (Eucibdelus) ishigakiensis Hayashi, 1997 (Coleoptera, Staphylinidae, Staphylininae), previously considered endemic to Ishigaki Island, is newly recorded on Iriomote Island in the Yaeyama Islands, Okinawa, Japan. Specimens were collected using light traps during winter and spring from mid‑January to late March over nearly 20 years by an experienced amateur coleopterist. These records indicate that adults are attracted to artificial light and suggest potential seasonal differences from Ishigaki populations. This study provides new insights into the distribution and phenology of the species and emphasizes the value of long‑term, community‑based monitoring.

Keywords

Arboreal beetles, citizen science, flower‑visiting beetles, light trapping, new distributional re‑ cord, phototactic behavior, Ryukyu Islands