This species nests in wood or stems of live or dead, standing plants.
Distribution based on Regional Taxon Lists
Distribution based on AntMaps
Distribution based on AntWeb specimens
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Castro et al (2017) studied the nesting and foraging biology of this species in a block of Brazilian Atlantic Forest. They found M. arthuri nests in wood or stems of live or dead, standing plants. It does not create satellite nests in twigs on the ground, as has been observed in some other Myrmelachista species. Workers are visible and active on the stems of plants, using established foraging trails throughout the day. They forage in the leaf litter and arborearly. Activity tended to be more intense during the warmer parts of the day, a pattern that was more pronounced during the cold/dry season. Warm/wet season foraging, less intense despite alate production during that time, likely results in more efficient foraging due to higher food availability. Seasonal shifts in diet, i.e., the quantity and identity of food items, was evident through examining laden foragers. Overall, M. arthuri is a generalist. It collects all kinds of insects and feeds on plant exudates as well. One unexpected finding was the high abundance of springtails collected.
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- arthuri. Myrmelachista arthuri Forel, 1903c: 263 (diagnosis in key) (w.) BRAZIL. Combination in M. (Decamera): Emery, 1925b: 33; in M. (Hincksidris): Kempf, 1972a: 148. Senior synonym of ute: Kempf, 1978: 36. Current subspecies: nominal plus brunneiceps.
- ute. Myrmelachista ute Kusnezov, 1969: 34 (w.) ARGENTINA. Junior synonym of arthuri: Kempf, 1978: 36.
- Castro, G.H.P., Kayano, D.Y., Souza, R.F., Hilsdorf, A.W.S., Feitosa, R.M., Morini, M.S.C. 2017. Seasonal Patterns of the Foraging Ecology of Myrmelachista arthuri Forel, 1903 (Formicidae: Formicinae). Sociobiology, 64(3), 237-243 DOI: 10.13102/sociobiology.v64i3.1629).
- Emery, C. 1925d. Hymenoptera. Fam. Formicidae. Subfam. Formicinae. Genera Insectorum 183: 1-302 (page 33, Combination in M. (Decamera))
- Forel, A. 1903e. Mélanges entomologiques, biologiques et autres. Ann. Soc. Entomol. Belg. 47: 249-268 (page 263, (diagnosis in key) worker described)
- Kempf, W. W. 1972b. Catálogo abreviado das formigas da regia~o Neotropical. Stud. Entomol. 15: 3-344 (page 148, Combination in M. (Hincksidris))
- Kempf, W. W. 1978b. Five new synonyms for the Argentine ant fauna (Hymenoptera, Formicidae). 112. Stud. Entomol. 20: 35-38 (page 36, Senior synonym of ute)
- Nakano, M.A., Miranda, V.F.O, Feitosa, R.M. & Morini, M.S.C. 2014. The geneic Characterizaion of Myrmelachista Roger Assemblages (Hymenoptera: Formicidae: Formicinae) in the Atlanic Forest of Southeastern Brazil. Sociobiology 61, 21-27.