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    A Fossil Skull of the Extant Blue Marlin (Makaira nigricans Lacepe`de, 1802) from the Late Miocene of Orange County, California

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    Subject
    Fossil; Blue Marlin; Makaira nigricans; Late Miocene
    Author
    Fierstine, Harry L.
    Journal Title
    Scas: Bulletin of the Southern California Academy of Sciences
    Issue
    scas/vol107/iss2; 2
    Metadata
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    URI
    https://scholar.oxy.edu/handle/20.500.12711/11288
    Abstract
    A nearly complete fossil skull, including the rostrum, of blue marlin, Makaira nigricans Lacepe`de, 1802 (Perciformes: Xiphioidei: Istiophoridae), was collected from the Oso Member (latest Miocene) of the Capistrano Formation, Mission Viejo, Orange County, California. The specimen is compared with extant and fossil istiophorids, and 19 of its 20 morphological variables are within the range of values observed for extant M. nigricans, whereas only 13 or less variables are within the observed range of other extant istiophorids. Because extant M. nigricans usually inhabits a water column with a height of about 200 m or more and is the most tropical of all xiphioid species, its presence supports the hypotheses that the Oso Member was deposited at upper bathyal depths or greater and that the coastal paleoclimate of southern California was warmer during the late Miocene than at present.
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