| Summary: | Isocyamus kogiae n. sp. is described from a pygmy sperm whale Kogia breviceps (De Blainville, 1838) stranded on Moreton Island, Queensland, Australia. It belongs in the genus Isocyamus because of its white appearance, epaulette-like processes at the anterior dorsum of pereon segment 2, lateral spines on segments 3 and 4, reduced maxilliped, and absence of maxilliped palps, large accessory gills and dentate comb on the dactyle of gnathopod 1. It differs from Isocyamus delphini (Guerin-Meneville, 1836), the only other member of this genus, in that the accessory gills are not equal in length to the main gills, it has no ventral spines, and the dactylus of percopod 1 has a double rather than a single dentate comb. This is the first report of a cyamid from whales of the genus Kogia.
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