Recovered 1999 Field Notebooks Enable Formal Description of Ikawaihere koehleri Tarpon Holotype in New Zealand Journal of Geology and Geophysics

{"The notebooks, donated by Köhler's family after a 2025 visit to Otago Geology, recorded exact coordinates above Waihere Bay and the three-dimensional preservation context within steep cliffs. Combined with the 1.2 m mummified specimen prepared by Andrew Grebneff, these data permitted submission of a Fossil Record Form and completion of a manuscript left unfinished at Ewan Fordyce's death in 2023. The study, led by Mike Gottfried with Daphne Lee, appears in the New Zealand Journal of Geology and Geophysics.","Three-dimensional preservation reveals diagnostic tarpon characters including an upturned mouth, rigid cycloid scales, and a deeply forked caudal fin, confirming active pelagic predation. This fills a 55-million-year gap in southern-hemisphere Megalopidae, previously known only from isolated scales or younger strata. Archival recovery demonstrates how undocumented field data can block taxonomic progress even when exceptional specimens exist in collections for decades.","Contextual comparison with Northern Hemisphere Eocene tarpons shows Ikawaihere koehleri occupied an equivalent high-trophic niche in the proto-Pacific, implying early Cenozoic cosmopolitanism followed by regional extirpation. The case parallels other delayed descriptions reliant on lost locality data, such as certain London Clay chondrichthyans, underscoring the value of institutional notebook archives.","Future fieldwork targeting correlative Paleogene horizons on Pitt Island and the main Chatham Islands could test whether additional predatory teleosts co-occurred; targeted matrix acid-preparation of existing blocks may also yield associated prey items within five years."}