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Balaenoptera ryani : ウィキペディア英語版
Balaenoptera ryani

''"Balaenoptera" ryani'' is an extinct species of Balaenopteridae from the late Miocene of California. It was originally considered a species of ''Balaenoptera'', but is now recognized as more primitive than any extant or fossil balaenopterid and thus in need of a new generic name.〔T. A. Demere, A. Berta, and M. R. McGowen. 2005. The taxonomic and evolutionary history of modern balaenopteroid mysticetes. Journal of Mammalian Evolution 12(1/2):99-143〕
==Taxonomy==

The holotype of this species is CASG 1733, a partial skull from the Late Miocene (Tortonian) Monterey Formation of Saucito Rancho, California.〔G. D. Hanna and M. McLellan. 1924. A new species of whale from the type locality of the Monterey Group. Proceedings of the California Academy of Sciences 13(14):237-241〕 In their description of ''Parabalaenoptera'', Zeigler et al. (1997) assigned ''B. ryani'' to Cetotheriidae,〔Zeigler, C. V., Chan, G. L., and Barnes, L. G. (1997). A new late Miocene balaenopterid whale (Cetacea: Mysticeti), Parabalaenoptera baulinensis, (new genus and species) from the Santa Cruz Mudstone, Point Reyes Peninsula, California. Proc. Calif. Acad. Sci. 50: 115–138.〕 but a recent overview of fossil balaenopterid taxa considers it a distinct genus of balaenopterid based on a unique combination of primitive and derived characters.〔

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