Mysteries surrounding the Hector’s Dolphin holotype Electra hectori P.-J. Van Beneden, 1881

For more than 140 years, the type locality of the Hector’s dolphin, Cephalorhynchus hectori [Van Beneden 1881] and the whereabouts of the holotype have been in question. The species was based on a specimen from New Zealand, sent to Otto Finsch in Germany. Finsch forwarded the specimen to Pierre-Joseph Van Beneden in Belgium who described it as Electra hectori, without specifying whether its location was the NE coast of the South or the North Island. Of the six persons who may have shipped out the holotype, von Haast, Hutton, or Travers are the most likely; Potts, Hector and Buller are less plausible. The connections between NZ and European museums were analysed. Based on our review and the rarity of records from the NE coast of the North Island, we believe that the NE coast of the South Island should be considered the type locality, consistent with the nomenclature of the two subspecies C. h. hectori and C. h. maui. The holotype was partially destroyed at Leuven Museum during WWII, while remaining bones, transferred to the national museum in Brussels, possibly in 1964, were lost. Finally, we propose to change the species name to Aotearoa dolphin, to distinguish from the true Hector’s dolphin, the nominate subspecies C. hectori hectori.