Like most of other genera of moths, the monophyly
and the relationship within this genus are still in
dispute due to the bulkness of this genus (137
described species) (Schintlmeister 1994; Holloway
1999). The monophyly of the genus and the
relationship within this genus have never been tested;
even the comprehensive studies on the systematic
of this genus were very limited except the study on
taxonomy that has been conducted by Schintlmeister
(1994) and Holloway (1999) based on specimens
from Sumatra and Borneo.