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Interpretation of the Middle Jurassic ammonite genus Spiroceras
Published online by Cambridge University Press: 01 May 2009
Abstract
The taxonomy of the Middle Jurassic ammonite genus Spiroceras Quenstedt, 1856, is critically assessed. It is found that the genus was originally proposed conditionally without any included species, and the type species is Spiroceras bifurcatum Hyatt, 1900, by subsequent monotypy. A neotype is now designated for that species, because Hyatt's figured holotype is lost.
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