page_title: List of the Mesozoic life of Alaska
section_title: D
hierarchical_section_title: List of the Mesozoic life of Alaska / D
caption_attribution_description: English: Reconstructions of the heteromorph ammonites Didymoceras stevensoni (right), D. nebrascensis (upper left), and D. cheyennese (lower left), of the Upper Campanian epoch of Cretaceous United States.
context_page_description: This list of the Mesozoic life of Alaska contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Alaska and are between 252.17 and 66 million years of age.
context_section_description: †Dactylioceras
  †Dactylioceras commune – or unidentified comparable form
  †Dactylioceras kanense
  †Dagyspirifer – type locality for genus
  †Dagyspirifer fascicostata – type locality for species
  †Damesites
  †Damesites hetonaiensis
  †Daonella
  †Daxatina
  †Daxatina canadensis – or unidentified comparable form
  Dentalina
  †Dentalium
  †Desmiophyllum
  †Desmiophyllum magnum
  †Desmiophyllum spp.
  †Desmoceras
  †Desmoceras japonicum
  †Desmophyllites
  †Desmophyllites diphylloides
  †Dettermania
  †Dettermania truncata – type locality for species
  Dicotylophyllum
  †Dicotylophyllum spp.
  †Dictyophyllum
  †Dictyophyllum nilssoni
   †Didymoceras
  †Didymoceras hornbyense – or unidentified related form
  †Dielasma – tentative report
  †Dielasma chapini – type locality for species
  †Dieneroceras
  †Dieneroceras dieneri
  †Dimyodon
  †Dimyodon storrsi
  †Diplomoceras
  †Diplomoceras notabile
  †Diplomoceras notable
  †Discamphiceras
  †Discamphiceras reissi – or unidentified related form
  †Discamphiceras silberlingi – or unidentified comparable form
  †Discophyllites
  †Discophyllites patens
  †Discotropites
  †Discotropites davisi
  †Discotropites mojsvarensis
  †Discotropites sandlingensis
  †Distichomeandra
  †Distichomeandra austriaca
  †Distichomeandra minor
  †Distichophyllia
  †Distichophyllia marmorea
  †Distichophyllia melnikovae – type locality for species
  †Distichophyllia norica
  Ditrupa
  †Ditrupa cornu – type locality for species
  †Divatella
  †Divatella robinsoni – type locality for species
  †Docidoceras
  †Docidoceras camachoi – type locality for species
  †Docidoceras longalvum – or unidentified related form
  †Docidoceras paucinodosum – type locality for species
  †Docidoceras widebayense – type locality for species
   †Douvilleiceras
  †Douvilleiceras mammillatum
  †Dromaeosaurus
  †Dromaeosaurus albertensis
caption: Restoration of several species of the Late Cretaceous ammonoid cephalopod Didymoceras
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