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

Smenispa irregularis (Bleeker, 1857) is reported from the host Acanthopagrus latus (Sparidae) from Western Australia. The nomenclatural change from Enispa Schioedte and Meinert, 1884 to Smenispa Özdikem, 2009 is discussed and a full description provided for Smenispa irregularis. 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.