After reviewing descriptions of the widely distributed M. lineata in the
literature (Pellegrin 1907, Chu and Chen 1989, Nguyen and Ngo 2001) and examining specimens, Gan et al.
(2009) thought this species should be split into two; for the time being its status remains unclear. There is less
doubt about M. formosae and two other newly described species: M. longinasus (Gan et al. 2009) and M. bounthobi