Smenispa irregularis (Bleeker, 1857) (Crustacea: Isopoda: Cymothoidae), a buccal-attaching fish parasite from Australia

<em>Smenispa irregularis (</em>Bleeker, 1857) is reported from the host <em>Acanthopagrus latus</em> (Sparidae) from Western Australia. The nomenclatural change from <em>Enispa </em>Schioedte and Meinert, 1884 to <em>Smenispa </em>Özdikem, 2009 is discussed and a full description provided for <em>Smenispa irregularis. </em>The species is identified by the strongly vaulted body shape, pereonites 1 and 2 arching anteriorly, cephalon embedded in pereonite 1, lateral margins of pereonites subparallel, and the lateral margins of pleonites subparallel and arching posteriorly.