But eventually it was determined that despite a superficial similarity, M. eupselias is not a member of the Acentropinae, and hence by grass moth standards not at all closely related to Aulacodes.
The tegumen is almost square, and at the hind end of the upper side bears two groups of long, thick bristles; the anellus is small, flat, but notably sclerotized (hardened).
[1] Even though this moth was described almost a century ago and does not seem to be uncommon at least in the uplands of southern Fatu Hiva (where it has been collected numerous times), the ecology of this species is almost completely unknown.
It is suspected to inhabit the more or less dense native woodland, and may have been driven to the uplands by deforestation for agriculture; the modern records of this species are generally from 600 m (c. 2000 ft) ASL to the mountain peaks.
Plants that occur in its habitat are for example Bidens henryi, Cheirodendron bastardianum, Pandanus, and east Polynesian blueberry (Vaccinium cereum), as well as numerous other shrubs, ferns, mosses and lichens.