The oldest pregnant mum


	The oldest pregnant mum

arifsali

5-28-2008 2:34 PM

397 views

tags:

fish, discovery

arifsali says:

Devonian fossilized fish contains an embryo.

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/a471b04b-7e4f-49f8-9a51-c12facff5374/C217DC25-6004-4ADB-9453-DB41927657F5/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.nature.com/news/2008/080528/full/453575a.html?s=news_rss" href="http://www.nature.com/news/2008/080528/full/453575a.html?s=news_rss" style="font-size: 11px;">www.nature.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.nature.com/news/2008/080528/full/453575a.html?s=news_rss"><P>Researchers in Australia have uncovered the oldest record of live birth — viviparity — in any vertebrate (see <A href="http://www.nature.com/uidfinder/10.1038/nature06966">page 650</A>). The discovery of embryos in fossils of placoderms (ancient, armoured, jawed fish) indicates that vertebrates have been copulating and giving birth to live young for at least 380 million years.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.nature.com/news/2008/080528/full/453575a.html?s=news_rss"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/www.nature.com/img/E2E905E2-D9E1-4C00-8294-818A75CB0195" alt="A placoderm fish containing an embryo. Click for larger version." /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.nature.com/news/2008/080528/full/453575a.html?s=news_rss"><P>“We've discovered the world's oldest [pregnant] mother,” says palaeontologist John Long at Museum Victoria in Melbourne, Australia, who led the study. Previously, the earliest records of viviparity were from marine reptiles from the Jurassic period that date back to around 180 million years ago, he says.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.nature.com/news/2008/080528/full/453575a.html?s=news_rss">The fossils are from the Gogo Formation, a one-time coral reef in northwest Australia that is renowned for its remarkably well-preserved fish from the Devonian period, some 380</blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/C217DC25-6004-4ADB-9453-DB41927657F5/blog/" title="blog or email this clip"><img src="http://content6.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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