A member of the ceylonicus group.
Distribution based on Regional Taxon Lists
Distribution based on AntMaps
Distribution based on AntWeb specimens
Check data from AntWeb
Known only from the worker caste.
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- orientalis. Eciton (Aenictus) ceylonicus subsp. orientalis Karavaiev, 1926d: 423, fig. 2 (w.) INDONESIA (Aru I.). Junior synonym of ceylonicus: Wilson, 1964a: 452. Revived from synonymy, raised to species and senior synonym of papuanus, similis: Shattuck, 2008c: 18.
- Eciton (Aenictus) ceylonicus subsp. orientalis: Three worker syntypes from Wammar, Aru Island, Indonesia (Australian National Insect Collection).
- Aenictus papuanus: Two worker syntypes from Malufu, Wharton Range, Papua New Guinea (Museum of Comparative Zoology).
- Aenictus similis: Fourteen worker syntypes from Maffin Bay, Irian Jaya, Indonesia (2 in Museum of Comparative Zoology).
The following taxonomic notes are offered by Shattuck (2008):
In this species the pronotal humeral angles are well developed, causing the anterodorsal surface of the pronotum to be nearly vertical, in dorsal view the area between the humeral angles is weakly convex to weakly concave. This is in contrast to the otherwise similar A. prolixus and A. turneri where the humeral angles are weakly developed and the anterodorsal section of the pronotum is gradually sloping, the area between the humeral angles being moderately convex. In addition, A. orientalis can be separated from A. prolixus by the shorter scapes (SI 65–82 vs. 89–96) and from A. turneri by the yellow head and legs which contrast with the yellow-red mesosoma (the body is essentially uniform in colour in A. turneri).
- Eciton (Aenictus) ceylonicus orientalis Karavaiev, 1926: Syntype, 3 workers, Wammar, Aru, Indonesia, Karawajew, ANIC32-017906, Australian National Insect Collection.
- Eciton (Aenictus) ceylonicus orientalis Karavaiev, 1926: Syntype, 2 workers (one damaged, one missing), Wammar, Aru, Indonesia, Museum of Comparative Zoology.
- Shattuck, S.O. (2008) Review of the ant genus Aenictus (Hymenoptera: Formicidae) in Australia with notes on A. ceylonicus (Mayr). Zootaxa 1926, 1–19.