Archaeocete-like jaws in a baleen whale

• Published in: Biology Letters
• Main Author: Fitzgerald, Erich M. G.
• Format: Article in Journal/Newspaper
• Language: English
• Published: The Royal Society 2011
• Subjects: baleen whale; baleen whales
• Online Access: http://dx.doi.org/10.1098/rsbl.2011.0690; https://royalsocietypublishing.org/doi/pdf/10.1098/rsbl.2011.0690; https://royalsocietypublishing.org/doi/full-xml/10.1098/rsbl.2011.0690

The titanic baleen whales (Cetacea, Mysticeti) have a bizarre skull morphology, including an elastic mandibular symphysis, which permits dynamic oral cavity expansion during bulk feeding. How this key innovation evolved from the sutured symphysis of archaeocetes has remained unclear. Now, mandibles of the Oligocene toothed mysticete Janjucetus hunderi show that basal mysticetes had an archaeocete-like sutured symphysis. This archaic morphology was paired with a wide rostrum typical of later-diverging baleen whales. This demonstrates that increased oral capacity via rostral widening preceded the evolution of mandibular innovations for filter feeding. Thus, the initial evolution of the mysticetes' unique cranial form and huge mouths was perhaps not linked to filtering plankton, but to enhancing suction feeding on individual prey.