"Zoonomen - Zoological Nomenclature Resource" maintained by Alan P. Peterson at http://www.zoonomen.net
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Former subspecies of Pterodroma externa have been elevated to full species status, so the nominotypical subspecies is no longer needed
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ITIS taxonomy is based on the latest scientific consensus available,
and is provided as a general reference source for interested parties.
However, it is not a legal authority for statutory or regulatory purposes.
While every effort has been made to provide the most reliable and up-to-date
information available, ultimate legal requirements with respect to species
are contained in provisions of treaties to which the United States is a
party, wildlife statutes, regulations, and any applicable notices that have
been published in the Federal Register. For further information on U.S.
legal requirements with respect to protected taxa, please contact the
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