Trephionus abiba Sasakawa & Itô, 2018 Holotype
Male adult
Mt. Ishikiri (entrance of the Ishikiri Cave), Haguro, Tainai-shi, Niigata Pref. (38.051754°N, 139.435703°E), 23.V.2013, H. Itô leg. Image from Kôji Sasakawa & Hirotarô Itô, 2018
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Trephionus inexpectatus Sasakawa & Itô, 2018 Holotype
Male adult
Kitazawa Pass, alt. ca. 2000 m, Hase-mura, Nagano Pref., 7–15.X.1998, M. Hama leg. Image from Kôji Sasakawa & Hirotarô Itô, 2018
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Trephionus niumontanus Sasakawa, 2018 Holotype
Male adult
Mt. Kunimi, asl. ca. 480 m, Fukui-shi, Fukui Pref., 27.VI.2012, S. Inoue leg. Image from Kôji Sasakawa & Hirotarô Itô, 2018
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Trephionus cylindriphallus Sasakawa, 2018
Male adult
12 - Holotype, 13 - Paratype from Abe Pass. Image from Kôji Sasakawa & Hirotarô Itô, 2018
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Trephionus cylindriphallus Sasakawa, 2018 Holotype
Male adult
Kawamata, University Forest in Chichibu, The University of Tokyo, Ôtaki, Chichibu-shi, Saitama Pref., 16.X.2009, N. Nishiyama leg. Image from Kôji Sasakawa & Hirotarô Itô, 2018
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Trephionus bifidilobatus Sasakawa & Itô, 2018 Holotype
Male adult
Kotosawa, alt. ca. 310 m, Mitake, Oume-shi, Tokyo (35.795931°N, 139.168746°E), 10–12.IX.2009, K. Sasakawa leg. Image from Kôji Sasakawa & Hirotarô Itô, 2018
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