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The branchial-attaching cymothoid genus,    Elthusa    Schioedte &amp; Meinert, 1884 is a genus with a worldwide distribution of 36 species, including the three species described here.    Elthusa   raynaudii    (Milne Edwards, 1840) is the only species that has been described from southern Africa. All South African material held at the  National Museum of Natural History, Paris, France  ( MNHN ) and the  Iziko South African Museum, Cape Town  ( SAMC ) identified as, or appearing to belong to,    Elthusa    was examined. Four species were identified,    Elthusa   raynaudii    and three species that proved to be undescribed.    Elthusa   xena    sp. n.  can be distinguished by an evenly rounded pereonite 1 anterior margin, a roughly rectangular pleotelson, and narrowly rounded uropod apices that extend to more than half the length of the pleotelson.    Elthusa   acutinasa    sp. n.  is identified by the produced and narrowly rounded cephalon anterior margin, acute uropods that are shorter than half the length of the pleotelson, and pereonite 1 anterior margin with medial projection.    Elthusa   rotunda    sp. n.  is characterised by the round body shape, broadly rounded uropod apices, and protrusions on the proximal and lateral margins of the merus and carpus of pereopod 7. A key to the South African    Elthusa    species is provided, together with a table summarising the hosts and localities of the 33 previously known species of    Elthusa   .

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Review of the fish parasitic genus    Elthusa    Schioedte &amp; Meinert, 1884 (  Crustacea  ,   Isopoda  ,   Cymothoidae  ) from South Africa, including the description of three new species