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internal fertilization 380-million year old snapshot of a live birth (1 viewing) (1) Guests
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TOPIC: internal fertilization 380-million year old snapshot of a live birth
#1679
Cj (Visitor)
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internal fertilization 380-million year old snapshot of a live birth  
Animation of the birth, plus photos of the fossil and discussion: http://news.bbc.co.uk/1/hi/sci/tech/7424281.stm Now, however, the team believes this ancient species bore live young through internal fertilisation (viviparity). Dr Long commented: This is not only the first time ever that a fossil embryo has been found with an umbilical cord, but it is also the oldest known example of any creature giving birth to live young. The existence of the embryo and umbilical cord within the specimen provides scientists with the first ever example of internal fertilisation - or sex - confirming that some placoderms had remarkably advanced reproductive biology. I gotta believe that a scientist who gets published in Nature knows the difference between internal fertilization and sex.  So, probably, the journalist misquoted him.  But the journalist herself seems to equate internal fertilization and viviparity.  Correct me if I am wrong, but don't birds have internal fertilization?  (At the risk of sounding like Ben Stein, Anyone? I'm also confused about the reference to an umbilical cord.  The reproduction in these ancient beasties is being compared to that in modern sharks and rays.  Viviparous, IIRC, but is there anything at all similar to an umbilical cord? Permit me to doubt that they're discussing a  true umbilical cord, do you know of any fish that are placentals? Cj
 
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Walter Bushell (Visitor)
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internal fertilization 380-million year old snapshot of a live birth  
Perplexed in Peoria < This e-mail address is being protected from spam bots, you need JavaScript enabled to view it wrote in message Glend < This e-mail address is being protected from spam bots, you need JavaScript enabled to view it wrote in message Animation of the birth, plus photos of the fossil and discussion: http://news.bbc.co.uk/1/hi/sci/tech/7424281.stm Now, however, the team believes this ancient species bore live young through internal fertilisation (viviparity). Dr Long commented: This is not only the first time ever that a fossil embryo has been found with an umbilical cord, but it is also the oldest known example of any creature giving birth to live young. The existence of the embryo and umbilical cord within the specimen provides scientists with the first ever example of internal fertilisation - or sex - confirming that some placoderms had remarkably advanced reproductive biology. I gotta believe that a scientist who gets published in Nature knows the difference between internal fertilization and sex.  So, probably, the journalist misquoted him.  But the journalist herself seems to equate internal fertilization and viviparity.  Correct me if I am wrong, but don't birds have internal fertilization?  (At the risk of sounding like Ben Stein, Anyone? I'm also confused about the reference to an umbilical cord.  The reproduction in these ancient beasties is being compared to that in modern sharks and rays.  Viviparous, IIRC, but is there anything at all similar to an umbilical cord? Permit me to doubt that they're discussing a  true umbilical cord, do you know of any fish that are placentals? Cj All the placentals are fish.   {Somebody had to say it.}
 
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John Wilkins (Visitor)
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internal fertilization 380-million year old snapshot of a live birth  
Permit me to doubt that they're discussing a  true umbilical cord, do you know of any fish that are placentals? Cj All the placentals are fish.   {Somebody had to say it.} Speaking of things somebody had to say, I should point out that All A are B does not entail All B are A. Or, if you like, that something is a member of a set A, which includes a subset B, doesn't mean that thing is included in subset B... It's a common mistake made on this group (although of course I am not saying Walter makes it here).
 
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