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A new species of lepocreadiid,  Opechonoides opisthoporus  n. sp. , is described infecting 12 pomacentrid fish species from the Great Barrier Reef, Australia, with  Abudefduf whitleyi  Allen &amp; Robertson as the type-host. This taxon differs from the only other known member of the genus,  Opechonoides gure  Yamaguti, 1940, in the sucker width ratio, cirrus-sac length, position of the testes, position of the pore of Laurer’s canal, and relative post-testicular distance. The new species exhibits stenoxenic host-specificity, infecting pomacentrids from seven genera:  Abudefduf  Forsskål,  Amphiprion  Bloch &amp; Schneider,  Neoglyphidodon  Allen,  Neopomacentrus  Allen,  Plectroglyphidodon  Fowler &amp; Ball,  Pomacentrus  Lacépède and  Stegastes  Jenyns. Phylogenetic analyses of 28S rDNA sequence data demonstrate that  O. opisthoporus  n. sp.  forms a strongly supported clade with  Prodistomum orientale  (Layman, 1930) Bray &amp; Gibson, 1990. The life cycle of this new species is partly elucidated on the basis of ITS2 rDNA sequence data; intermediate hosts are shown to be three species of Ctenophora. New host records and molecular data are reported for  Lepocreadium oyabitcha  Machida, 1984 and  Lepotrema amblyglyphidodonis  Bray, Cutmore &amp; Cribb, 2018, and new molecular data are provided for  Lepotrema acanthochromidis  Bray, Cutmore &amp; Cribb, 2018 and  Lepotrema adlardi  (Bray, Cribb &amp; Barker, 1993) Bray &amp; Cribb, 1996. Novel  cox 1 mtDNA sequence data showed intraspecific geographical structuring between Heron Island and Lizard Island for  L. acanthochromidis  but not for  L. adlardi  or  O. opisthoporus  n. sp.

A new species, new host records and life cycle data for lepocreadiids (Digenea) of pomacentrid fishes from the Great Barrier Reef, Australia