New mosasaur specimens of Piripauan‐Haumurian (Campanian‐Maastrichtian) age are described from the Mangahouanga Stream, North Island, New Zealand. These include two distinctive adult skulls and one incomplete cranial and postcranial specimen. A new genus and species Rikisaurus tehoensis is recognised and a new species of Mosasaurus, M.flemingi , is described. A further specimen is identified as aff. Prognathodon overtoni . Two fragmentary specimens are also described (as aff. Moanasaurus mangahouangae and gen. and sp. indet.), along with an isolated adult limb bone (gen. and sp. indet.) of a type not previously collected in New Zealand.
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J. Wiffen (1990) studied this question.
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