Monthly Archives: February 2015

DINOSAURICON K

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K

  • Kaatedocus   Kaatedocus  /  A new taxon of diplodocid sauropod Kaatedocus siberi gen. et sp. nov., Kaatedocus siberi gen. et sp. nov., is recognized based on well-preserved cervical vertebrae and skull from the Morrison Formation (Kimmeridgian, Late Jurassic) of northern Wyoming, USA. A phylogenetic analysis places it inside Diplodocinae (Sauropoda, Flagellicaudata), as a sister taxon to a clade uniting Tornieria africana and the classical diplodocines Barosaurus lentus and Diplodocus. The taxon is diagnosed by a unique combination of plesiomorphic and derived traits, as well as the following unambiguous autapomorphies within Diplodocidae: frontal separated anteriorly by a U-shaped notch; squamosals restricted to the post-orbital region; presence of a postorbital foramen, a narrow sharp and distinct sagittal nuchal crest; the paired basal tuber with a straight anterior edge in ventral view; anterior end of the prezygapophyses of mid- and posterior cervical vertebrae is often an anterior extension of…

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