Order Cetacea Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 1 723 743 book chapter 0-8018-8221-4 10.5281/zenodo.7316519 Mesoplodon traversii Gray 1873 Mesoplodon traversii Gray 1873 , Trans. New Zealand Inst. (1873), 6: 96 . Type Locality: Chatham Isl, New Zealand . Vernacular Names: Spade-toothed Whale . Synonyms: Mesoplodon bahamondi Reyes, Van Warebeek, Cárdenas, and Yáñez 1996 . Distribution: South Pacific: temperate waters; known from 3 specimens : Pitt Isl (Chatham Isls), White Isl (North Isl, N.Z.) and Robinson Crusoe Isl (Juan Fernadez Arch., Chile ). Conservation: CITES – Appendix II. Discussion: Was considered synonymous with Mesoplodon layardii until Helden et al. (2002) compared the DNA sequence from the type and determined that it was the same species as M. bahamondi . This species is the rarest member of the Ziphiidae .