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Vestibular evidence for the evolution of aquatic behaviour in early cetaceans
It is hypothesized that the unparalleled modification of the semicircular canal system represented a key ‘point of no return’ event in early cetacean evolution, leading to full independence from life on land. Expand
Skeletons of terrestrial cetaceans and the relationship of whales to artiodactyls
Cladistic analysis of the skeletons of two early Eocene pakicetid cetaceans, the fox-sized Ichthyolestes pinfoldi, and the wolf-sized Pakicetus attocki, indicates that cetACEans are more closely related to artiodactyls than to any mesonychian, and supports monophyly of artiodACTyls. Expand
Morphoregulation of teeth: modulating the number, size, shape and differentiation by tuning Bmp activity
Modulation of Bmp signaling exemplifies morphoregulation hypothesis: simple alteration of key signaling pathways can be used to transform a prototypical conical‐shaped tooth into one with complex morphology. Expand
Fossil Evidence for the Origin of Aquatic Locomotion in Archaeocete Whales
The fossil indicates that archaic whales swam by undulating their vertebral column, thus forcing their feet up and down in a way similar to modern otters. Expand
Phylogenetic aspects of Cetacean origins: A morphological perspective
  • J. Thewissen
  • Biology
  • Journal of Mammalian Evolution
  • 1 September 1994
A phylogenetic analysis of cetaceans, five groups of mesonychians, and five other groups of ungulates indicates that Pakicetus is the sister group to all other cetACEans, and that Cete (mesonychian and Cetacea) is a monophyletic group. Expand
Isotopic Approaches to Understanding the Terrestrial-to-Marine Transition of the Earliest Cetaceans
The fossil record is replete with examples of evolutionary transitions between marine and freshwater environments, in both directions. Perhaps the most striking and best documented example of such aExpand
Olfaction and brain size in the bowhead whale (Balaena mysticetus)
The olfactory anatomy of bowhead whales was investigated and it was determined that bowheads have a sense of smell, and it is speculated that they may use this to find aggregations of krill on which they feed. Expand
New Middle Eocene Archaeocetes (Cetacea:Mammalia) from the Kuldana Formation of Northern Pakistan
The new pakicetid dentitions described here are the most complete to date and further the understanding of pakICetid dental diversity. Expand
Attockicetus praecursor, A New Remingtonocetid Cetacean from Marine Eocene Sediments of Pakistan
A new early-to-middle Eocene cetacean from the Kala Chitta Hills of northern Pakistan is described: Attockicetus praecursor new genus and species. It is based on fragmentary cranial material,Expand
Locomotor evolution in the earliest cetaceans: functional model, modern analogues, and paleontological evidence
It is concluded that Ambulocetus may have locomoted by a combination of pelvic paddling and dorsoventral undulations of the tail, and that its locomotor mode in water resembled that of the modern otter Lutra most closely. Expand