Notices
Results 1 to 4 of 4

Thread: Descent of Birds

  1. #1 Descent of Birds 
    SHF
    SHF is offline
    Forum Sophomore
    Join Date
    Sep 2012
    Location
    London
    Posts
    107
    Is it odd that birds descend from saurischia (lizard hipped) and not ornithischia (bird hipped)?


    Reply With Quote  
     

  2.  
     

  3. #2  
    Forum Professor Zwirko's Avatar
    Join Date
    Sep 2008
    Location
    55 N, 3 W
    Posts
    1,085
    It's probably a case of convergent evolution of hip structures and an historical accident of terminology (my guess).


    Reply With Quote  
     

  4. #3  
    Moderator Moderator Cogito Ergo Sum's Avatar
    Join Date
    Jun 2013
    Location
    Belgium
    Posts
    2,519
    Quote Originally Posted by Zwirko View Post
    It's probably a case of convergent evolution of hip structures and an historical accident of terminology (my guess).

    Your guess is correct:
    "Oddly, birds are derived from the "lizard-hipped" dinosaurs and not from the "bird-hipped" ornithiscian dinosaurs. The "bird-hipped" condition of a pubis pointing toward the back of the animal occurred twice independently, once in the ornithischians and once in the lineage leading to birds, an example of convergent evolution. Thus "ornithischia," taken literally, is a misnomer, since the ornithischians have ornithischian-like pelves, not bird-like. Only birds (and their immediate ancestors) have bird-like pelves."


    Source:
    The Saurischia
    "The only safe rule is to dispute only with those of your acquaintance of whom you know that they possess sufficient intelligence and self-respect not to advance absurdities; to appeal to reason and not to authority, and to listen to reason and yield to it; and, finally, to be willing to accept reason even from an opponent, and to be just enough to bear being proved to be in the wrong."

    ~ Arthur Schopenhauer, The Art of Being Right: 38 Ways to Win an Argument (1831), Stratagem XXXVIII.
    Reply With Quote  
     

  5. #4  
    WYSIWYG Moderator marnixR's Avatar
    Join Date
    Apr 2007
    Location
    Cardiff, Wales
    Posts
    5,810
    and as with many characteristics, dromaeosaurs have modified the saurischian pelvis to become more bird-like :

    The dromaeosaur pubis ornithischian saurischians
    "Reality is that which, when you stop believing in it, doesn't go away." (Philip K. Dick)
    Reply With Quote  
     

Similar Threads

  1. Replies: 1
    Last Post: September 2nd, 2012, 04:58 AM
  2. Direct Descent, by Frank Herbert
    By Omphalos in forum Science-Fiction and Non-Fiction
    Replies: 0
    Last Post: March 18th, 2010, 09:11 PM
  3. Birds in the park
    By organic god in forum Biology
    Replies: 86
    Last Post: March 14th, 2009, 11:40 AM
  4. Is E=MC2 related to gravitational descent rates?
    By That Rascal Puff in forum Personal Theories & Alternative Ideas
    Replies: 0
    Last Post: July 13th, 2006, 04:39 PM
  5. A birds tail
    By Metatron in forum Biology
    Replies: 10
    Last Post: October 16th, 2005, 05:02 PM
Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •