FIGURES 31–34. Cardicola lafii n. sp. from the atrium and ventricle (heart) of Siganus fuscescens off Lizard Island. 31. Adult, whole mount, dorsal view. Posterior caeca unclear in outline, path seen as convoluted due to colouration of intestinal contents. 32. Anterior region, dorsal view, showing vestigial oral sucker delimited by fine membrane. Although spines seen on sucker exact number of concentric rows not clear, spines illustrated to show their presence only. 33. Male terminal genitalia, ventral view. 34. Female terminal genitalia, dorsal view. Vitelline duct and vitelline reservoir omitted from figure as they obscure the path of the uterus as they pass posteriorly. Scale­bars: 31, 250 m; 32–34, 100 m.