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Hesperornithiform Birds from Late Cretaceous of Arkansas



Ben Creisler
bcreisler@gmail.com

A recent paper:


Alyssa Bell, Kelly J. Irwin and Leo Carson Davis (2015)
Hesperornithiform Birds from the Late Cretaceous (Campanian) of Arkansas, USA.
Transactions of the Kansas Academy of Science 118(3 & 4):219-229
doi: http://dx.doi.org/10.1660/062.118.0305
http://www.bioone.org/doi/abs/10.1660/062.118.0305

The Late Cretaceous Hesperornithiformes constitute a geographically
expansive order of early birds, spanning the Northern Hemisphere from
Asia to North America. Within North America, hesperornithiforms have
been reported from as far north as Ellesmere Island in the Arctic to
the Gulf Coastal Plain of southwest Arkansas, a distribution spanning
the entire Western Interior Seaway. This paper presents two new
specimens of Hesperornis from the middle to late Campanian of
Arkansas: an isolated phalanx from the third toe and a section of the
shaft of a tibiotarsus. These are the second and third occurrences of
Hesperornis from the southeastern-most portion of the range in North
America. An expanded description of the only other hesperornithiform
material from Arkansas, an isolated partial tarsometatarsus, is also
provided. Morphometric comparisons with other hesperornithiforms show
that these specimens are some of the largest known individuals of
Hesperornis.
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