pachyrhachis造句

• "Pachyrhachis " is one of three genera of Cenomanian snakes with hindlimbs.
• The position of " Pachyrhachis " within snakes has been debated ( e . g.
• This slender, 3-foot-long snake, Pachyrhachis problematicus, lived in a shallow sea 95 million years ago.
• Along with is sister genus " Pachyrhachis ", " Haasiophis " does not possess either a disarticulated slightly.
• In their journal report, the two paleontologists said the small, narrow, lightly built skull of Pachyrhachis had many characteristics found only in snakes.
• Caldwell and Lee called this " compelling evidence " that Pachyrhachis was " a primitive snake with a well-developed pelvis and hind limbs ."
• Most of these lizards were smaller than Pachyrhachis, though the best known of this group was the Mosasaurus, a huge sea monsters with jaws three-feet long.
• ""'Pachyrhachis " "'is an extinct genus of snake with well developed hind legs known from fossils discovered Ein Yabrud, near Ramallah, in the central West Bank.
• Pachyrhachis appears to have been an ancient marine snake; the fossils occur in a marine limestone deposit, and the thickened bone of the ribs and vertebrae would have functioned as ballast to decrease the buoyancy of the animal, allowing it to dive beneath the ancient Cretaceous seas that it once inhabited.
• The implication that the ancestors of snakes had hind legs is confirmed by fossil evidence : the Cretaceous snake " Pachyrhachis problematicus " had hind legs complete with hip bones ( pubis, ischium ), thigh bone ( femur ), leg bones ( tibia, fibula ) and foot bones ( calcaneum, astragalus ) as in tetrapods with legs today.
• Lee and Scanlon 2002; Rieppel et al . 2003 ) . " Pachyrhachis " is among the oldest known snakes and retains well-developed hind limbs, suggesting it represented a transitional form linking snakes to marine lizards ( Lee and Scanlon 2002 ), though other studies place " Pachyrhachis " within the modern snake radiation Macrostomata ( Zaher & Rieppel, 1999 ).
• Lee and Scanlon 2002; Rieppel et al . 2003 ) . " Pachyrhachis " is among the oldest known snakes and retains well-developed hind limbs, suggesting it represented a transitional form linking snakes to marine lizards ( Lee and Scanlon 2002 ), though other studies place " Pachyrhachis " within the modern snake radiation Macrostomata ( Zaher & Rieppel, 1999 ).
• Although many modern boas still retain remnants of legs, in the form of small spurs, the tiny legs of Pachyrhachis included a hip, knee, and ankle joint . " Pachyrhachis " was originally described by Haas ( 1979, 1980 ) who noted it had a puzzling melange of snake and lizard features; its status as an early snake was later confirmed ( Caldwell and Lee 1997 ).
• Although many modern boas still retain remnants of legs, in the form of small spurs, the tiny legs of Pachyrhachis included a hip, knee, and ankle joint . " Pachyrhachis " was originally described by Haas ( 1979, 1980 ) who noted it had a puzzling melange of snake and lizard features; its status as an early snake was later confirmed ( Caldwell and Lee 1997 ).