﻿AbstractTwo specimens representing the first known adults ofLestidiopsindopacificus(Ege, 1953) are reported and described from Taiwan, and the validity and generic assignment of this species are confirmed. The origin of the pelvic fin directly below the dorsal-fin base shows thatL.indopacificusbelongs to theL.mirabilisspecies complex. It can be separated from its congeners by the position of the nostrils above the posterior end of the maxilla, the light body color with unevenly distributed melanophores in adults, and a distinct combination of meristic values and other morphological characteristics. New geographic records are reported for the two other current members of this species complex,L.mirabilis(Ege, 1933) andL.extremus(Ege, 1953). The diagnostic features that separate these three very similar species are discussed.