News tagged with jawless vertebrates
Three periods of innovation in gene regulation occurred during the evolution of vertebrate animals: study
Over the past 530 million years, the vertebrate lineage branched out from a primitive jawless fish wriggling through Cambrian seas to encompass all the diverse forms of fish, birds, reptiles, amphibians, and mammals. Now ...
Aug 18, 2011 |
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Getting inside the mind (and up the nose) of our ancient ancestors
(PhysOrg.com) -- Reorganisation of the brain and sense organs could be the key to the evolutionary success of vertebrates, one of the great puzzles in evolutionary biology, according to a paper by an international ...
Other Sciences / Archaeology & Fossils
Aug 17, 2011 |
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Vertebrate jaw design locked 400 million years ago
More than 99 per cent of modern vertebrates (animals with a backbone, including humans) have jaws, yet 420 million years ago, jawless, toothless armour-plated fishes dominated the seas, lakes, and rivers. ...
Jul 06, 2011 |
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Biologists find that red-blooded vertebrates evolved twice, independently
(PhysOrg.com) -- Nature, in all its glory, is nothing if not thrifty.
Jul 27, 2010 |
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Search results for jawless vertebrates
New study showing pelvic girdles arose before the origin of movable jaws
Almost all gnathostomes or jawed vertebrates (including osteichthyans, chondrichthyans, ‘acanthodians’ and most placoderms) possess paired pectoral and pelvic fins. To date, it has generally been ...
Other Sciences / Archaeology & Fossils
Jan 10, 2012 |
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The peculiar feeding mechanism of the first vertebrates
A fang-like tooth on double upper lips, spiny teeth on the tongue and a pulley-like mechanism to move the tongue backwards and forwards -- this bizarre bite belongs to a conodont and, thanks to fresh fossil ...
Other Sciences / Archaeology & Fossils
May 19, 2011 |
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Hagfish found to eat through its skin
(PhysOrg.com) -- A new study in Canada has shown that the primitive fish called the Hagfish, which has the habit of burrowing into dead or dying creatures on the sea bed, eats by absorption through its skin ...
Mar 03, 2011 |
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Lampreys give clues to evolution of immune system
Biologists have discovered that primitive, predatory lampreys have structures within their gills that play the same role as the thymus, the organ where immune cells called T cells develop in mammals, birds and fish.
Feb 02, 2011 |
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Researchers discover genetic clues to evolution of jaws in vertebrates
(PhysOrg.com) -- A half-billion years ago, vertebrates lacked the ability to chew their food. They did not have jaws. Instead, their heads consisted of a flexible, fused basket of cartilage.
Sep 24, 2010 |
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Sea lamprey research sheds light on how stress hormones evolved
Michigan State University researchers are the first to identify a stress hormone in the sea lamprey, using the 500 million-year-old species as a model to understand the evolution of the endocrine system.
Jul 19, 2010 |
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Sea lampreys jettison one-fifth of their genome
(PhysOrg.com) -- Researchers have discovered that the sea lamprey, which emerged from jawless fish first appearing 500 million years ago, dramatically remodels its genome. Shortly after a fertilized lamprey ...
Jul 20, 2009 |
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Evolution of a contraceptive for sea lamprey
(PhysOrg.com) -- In addition to providing fundamental insights into the early evolution of the estrogen receptor, research by a team at the University of California, San Diego School of Medicine may lead to ...
Jun 25, 2009 |
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Gene decides whether coral relative will fuse or fight
When coral colonies meet one another on the reef, they have two options: merge into a single colony or reject each other and aggressively compete for space. Now, a report in the March 19th Current Biology, a Cell Press public ...
Mar 19, 2009 |
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Biologists find gene network that gave rise to first tooth
A paper in this week's PLoS Biology reports that a common gene regulatory circuit controls the development of all dentitions, from the first teeth in the throats of jawless fishes that lived half a billion years ago, to the ...
Biology /
Feb 10, 2009 |
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List of search results for jawless vertebrates
