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Additional info for Insects of Australia, Volume 1: A Textbook for Students and Research Workers
Skulls of dusky dolphins are distinct from those of hourglass dolphin and Peale’s dolphin—dusky dolphin skulls have a longer, narrower rostrum than either hourglass dolphin or Peale’s dolphin of comparable length and maturity, and the pre- and postorbital and zygomatic widths of dusky dolphin skulls are smaller than in the other two species (Fraser 1966).
Obscurus fitzroyi (South America), L. o. obscurus (South Africa), and an unnamed subspecies from New Zealand (Rice 1998, Jefferson et al. 2008). The division of L. obscurus into subspecies reflected the morphometric study done by Van Waerebeek in the early 1990s in which he quantitatively compared a suite of cranial measurements between groups of skulls collected from Peru, Chile, South Africa, and New Zealand (Van Waerebeek 1993a). The results of this study revealed a striking degree of variation in skull size and tooth number between populations; 29 of 31 morphometric characters were geographically different.
1999) published a phylogeny of the entire family Delphinidae that indicated strong support for a more recent common ancestry between L. obliquidens, L. obscurus, L. australis, L. cruciger, and the genera Cephalorhynchus and Lissodelphis, than to L. albirostris and L. 9). Based on these findings, LeDuc et al. (1999) proposed a revised taxonomy of the genus with Lagenorhynchus albirostris and Leucopleurus acutus representing the North Atlantic species and Sagmatias, from Sagmatias amblodon, a junior synonym of L.