Specimens were collected from nine locations in Indonesia from 2017–2019: around Sumatra Island (Simeulue Island, Karimunbesar Island, and Batam Island); Java Island from West Java province (Gunung Sindur, Cipinang, Cibinong, Karadenan, Parungpanjang) and the Special Capital Region of Jakarta (Pondok Kelapa); and Papua Island (Asmat Regency). Termites were preserved in 70% ethanol. Observations and photographs of the specimens were made using a digital microscope (VHX-5000, Keyence Corp., Osaka, Japan). Picture tracing was conducted using Drawing Pad (XP Pen Deco 2, Shenzhen, China) in Autodesk Sketchbook version 8.7.1. A total of 228 specimens of termite soldiers were measured (66 C. curvignathus, 10 C. elisae, 84 C. gestroi, 63 C. sepangensis, and 5 C. kalshoveni specimens). The identification was undertaken by collecting many characteristics from each specimen and matching them with references [16 (link),22 ,23 ,24 ,25 ,26 ,50 ,51 ,52 ,53 ]. The Indonesian specimens were deposited at the Museum Zoologicum Bogoriense and Research Center for Biomaterials–Indonesian Institute of Sciences (LIPI), Cibinong, Indonesia. All Japan specimens belong to the Research Institute for Sustainable Humanosphere (RISH)–Kyoto University, Kyoto, Japan.
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