page_title: List of extinct cetaceans
section_title: Family Allodelphinidae
hierarchical_section_title: List of extinct cetaceans / Suborder Odontoceti / Superfamily Platanistoidea / Family Allodelphinidae
caption_attribution_description: English: Life reconstruction of Arktocara yakataga
context_page_description: The list of extinct cetaceans features the extinct genera and species of the order Cetacea. The cetaceans are descendants of land-living mammals, the even-toed ungulates. The earliest cetaceans were still hoofed mammals. These early cetaceans became gradually better adapted for swimming than for walking on land, finally evolving into fully marine cetaceans.
  This list currently includes only fossil genera and species. However, the Atlantic population of gray whales became extinct in the 18th century, and the baiji was declared "functionally extinct" after an expedition in late 2006 failed to find any in the Yangtze River.
context_section_description: (Early to Middle Miocene)
  Allodelphis
  Arktocara
  Goedertius
  Ninjadelphis
  Zarhinocetus
caption: Life reconstruction of Arktocara yakataga
exif: {"Image Orientation": "Horizontal (normal)", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Adobe Photoshop CS3 Windows", "Image DateTime": "2018:03:09 16:45:21", "Image ExifOffset": "164", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "314", "Thumbnail JPEGInterchangeFormatLength": "2861", "EXIF ExifVersion": "0220", "EXIF ColorSpace": "Uncalibrated", "EXIF ExifImageWidth": "1000", "EXIF ExifImageLength": "750"}