Bibliography and Index of the Sirenia and Desmostylia  

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"Polcyn, Michael J."

 
D
 Chiba, Kentaro; Fiorillo, Anthony R.; Jacobs, Louis L.; Kimura, Yuri; Kobayashi, Yoshitsugu; Kohno, Naoki; Nishida, Yosuke; Polcyn, Michael J.; Tanaka, Kohei (detail)
   
2015
A new desmostylian mammal from Unalaska (USA) and the robust Sanjussen jaw from Hokkaido (Japan), with comments on feeding in derived desmostylids.
Historical Biology 28(1-2): 289-303. 1 tab. 9 figs. http://dx.doi.org/10.1080/08912963.2015.1046718 Publ. online Oct. 1, 2015.
–ABSTRACT: Derived members of the enigmatic mammalian order Desmostylia have molars comprising appressed columns whose morphology does not render their function in feeding simple to discern. Here we describe a new genus and species, Ounalashkastylus tomidai, more derived than Cornwallius but less derived than Desmostylus and Vanderhoofius, which develop a hypertrophied medial eminence on the dentary ontogenetically. Tooth morphology, vaulted palate and the medial eminence, which can rise to the level of the occlusal surface of M2, suggest that derived desmostylids clenched their teeth strongly while employing suction during feeding, most likely on marine and coastal plants.
Daryl P. Domning, Research Associate, Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560, and Laboratory of Evolutionary Biology, Department of Anatomy, College of Medicine, Howard University, Washington, D.C. 20059.
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