However, as most of them are only roughly dated and intermediate in size between this species and P. antarcticus, they should not be referred to either taxon pending a comprehensive review of the New Zealand material of Palaeeudyptes (which will probably result in recognizing that P. marplesi was a larger progenitor species or subspecies of P. antarcticus).
Because most of these specimens are only roughly dated and fall between this species and P. antarcticus in size, they should not be classified as either taxon until a thorough review of the New Zealand material of Palaeeudyptes is conducted (which will likely lead to recognizing that P. marplesi was a larger ancestor or subspecies of P. antarcticus).