Decamera Roger, 1863 Hincksidris Donisthorpe, 1944 Neaphomus Menozzi, 1935 Myrmelachista is a Neotropical genus of ants in the subfamily Formicinae.

The species in this genus are arboreal and engage in the specialized practice of nesting in trunk cavities and among twigs.

[3] The larvae of Myrmelachista ants are elongate and unremarkable, excepting for a few protruding dorsal hairs which might have a biological function in hanging larvae inside their nests.

[4] The circumscription of Myrmelachista species is a complex task because the morphological differences between individuals of a single species that originate from different colonies can be sufficient to cause these individuals to be erroneously regarded as members of different species.

[3] As of 2014[update], 58 Myrmelachista species have been described, with a few recognized subspecies; the diversity of this genus has most likely been underestimated due to the limited taxonomic knowledge available regarding Myrmelachista.