Eciton (Aenictus) ceylonicus subsp. orientalis Karavaiev, 1926d: 423, fig. 2 (w.) INDONESIA (Aru Is). Indomalaya.

Primary type information: Primary type material: syntype workers (number not stated, “numerous”). Primary type locality: Indonesia: Aru Is, Wammar I., 19.iii.1913 (W. Karawajew). Primary type depositories: ANIC, MZSP, SIZK. Primary type specimens: CASENT0916856, MZSP0082266. Type notes: 1) Kostyuk, 1976: 93, cites 64 worker syntypes in SIZK. 2) Radchenko et al., 2023: 17, cite 43 worker syntypes in SIZK. 3) Ulysséa et al., 2025: Table S1, cite 1 syntype worker in MZSP.