Pseudolacistorhynchus nanus n. sp (Cestoda : Trypanorhyncha) parasitic in the spiral valve of the zebra shark, Stegostoma fasciatum (Hermann, 1783)

Pseudolacistorhynchus nanus sp. nov. (Cestoda: Trypanorhyncha) is described from the spiral valve of the zebra shark, Stegostoma fasciatum (Hermann, 1783) from New Caledonia, Malaysia and northern Australia. The presence of paired bothria, a metabasal tentacular armature with a single row of intercalary hooks and the presence of a distinctive basal armature with bill-hooks place the species in the genus Pseudolacistorhynchus Palm, 1995. It is readily differentiated from congeners by its small size, in having six rather than five hooks in each principal row and four hooks in each intercalary row