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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
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internal fertilization 380-million year old snapshot of a live birth
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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. He added: This is a world first fossil find, and it opens up a window into the developmental biology of an entire extinct class of organisms. Another report states that this is also a new species. Glen Davidson http://tinyurl.com/2kxyc7 |
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internal fertilization 380-million year old snapshot of a live birth
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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. He added: This is a world first fossil find, and it opens up a window into the developmental biology of an entire extinct class of organisms. Another report states that this is also a new species. Glen Davidsonhttp://tinyurl.com/2kxyc7 It's both a new genus and a new species
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The administrator has disabled public write access. |
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internal fertilization 380-million year old snapshot of a live birth
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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. Well! If the armored fish of 380 mya had live births, now what about species that came later? How about Dimetrodon, 270 mya? I don't think they've found any Dimetrodon eggs. Maybe there weren't any, and those sail-fins were born live?
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The administrator has disabled public write access. |
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internal fertilization 380-million year old snapshot of a live birth
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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. Well! If the armored fish of 380 mya had live births, now what about species that came later? How about Dimetrodon, 270 mya? I don't think they've found any Dimetrodon eggs. Maybe there weren't any, and those sail-fins were born live? Hard to tell. What we do know is that if Dimetrodon had live birth, it evolved separately from live birth in mammals, because we know about monotremes.
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The administrator has disabled public write access. |
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internal fertilization 380-million year old snapshot of a live birth
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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?
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The administrator has disabled public write access. |
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internal fertilization 380-million year old snapshot of a live birth
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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? Looks like an umbilical to me... http://www.seaworld.org/animal-info/info-books/sharks-&-rays/birth-&-...
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