An updated concept and revised composition for Hamacreadium Linton, 1910 (Opecoelidae: Plagioporinae) clarifies a previously obscured pattern of host-specificity among species Author Martin, Storm B. Author Cutmore, Scott C. Author Ward, Selina Author Cribb, Thomas H. text Zootaxa 2017 4254 2 151 187 journal article 33240 10.11646/zootaxa.4254.2.1 64b0d4b0-479e-484a-aaf5-d5237292d4a5 1175-5326 545862 0BDF72E4-5330-4EE7-8560-DF44E71C1F41 Cainocreadium epinepheli ( Yamaguti, 1934 ) Durio & Manter, 1968 Synonyms: Hamacreadium epinepheli Yamaguti, 1934 ; Cainocreadoides epinepheli ( Yamaguti, 1934 ) , Nagaty 1956 . Records. From the Hong Kong grouper, Epinephelus akaara (Temminck & Schlegel) (Serranidae) , and Lethrinus haematopterus off Japan by Yamaguti (1934) . From the spottedtail morwong, Cheilodactylus zonatus Cuvier ( Perciformes : Cheilodactylidae ) [as Goniistius zonatus (Cuvier) ] off Japan by Yamaguti (1940) . From the areolate grouper, Epinephelus areolatus (Forsskål) , E . chlorostigma , the Summan grouper, Epinephelus summana (Forsskål) , the greasy grouper, Epinephelus tauvina (Forsskål) , and L . nebulosus in the Persian/Arabian Gulf by Saoud et al . (1986) . From E . quoyanus and E . merra off Heron Island , southern Great Barrier Reef, Australia by Bray & Cribb (1989) . Remarks. This species has a medial genital pore, a strongly tapered teat-like posterior and is well established as a genuine species of Cainocreadium .