Why those fishes went extinct 65 million years ago

Why those fishes went extinct 65 million years ago
Large size and a fast bite spelled doom for bony fishes during the last mass extinction 65 million years ago, as per a newly released study to be published March 31, 2009, in the Proceedings of the National Academy of Sciences Today, those same features characterize large predatory bony fishes, such as tuna and billfishes, that are currently in decline and at risk of extinction themselves, said Matt Friedman, author of the study and a graduate student in evolutionary biology at the University of Chicago........
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Match between molecular, fossil data
During a seminar at another institution several years ago, University of Chicago paleontologist David Jablonski fielded a hostile question: Why bother classifying organisms as per their physical appearance, let alone analyze their evolutionary dynamics, when molecular techniques had already invalidated that approach?.......
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New piece in the jigsaw puzzle of human origins
In an article in today's Nature, Uppsala researcher Martin Brazeau describes the skull and jaws of a fish that lived about 410 million years ago. The study may give important clues to the origin of jawed vertebrates, and thus ultimately our own evolution. Ptomacanthus anglicus was a very early jawed fish that lived in the Devonian period some 410 million years ago. Typically it represents a type of fossil fish known as an "acanthodian" which is characterized by a somewhat shark-like appearance and sharp spines along the leading edges of all fins (except for the tail fin). This group of early jawed fishes may reveal a great deal about the origin of jawed vertebrates (a story that ultimately includes our own origins). However, their relationships to modern jawed vertebrates (and thus their evolutionary significance) are poorly understood, owing partly to the fact that we know very little about their internal head skeleton........
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CT to reveal hidden face
Using CT imaging to study a priceless bust of Nefertiti, scientists have uncovered a delicately carved face in the limestone inner core and gained new insights into methods used to create the ancient masterpiece and information pertinent to its conservation, as per a research studyreported in the recent issue of Radiology.......
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Did dinosaurs die from an asteroid hit?
The enduringly popular theory that the Chicxulub crater holds the clue to the demise of the dinosaurs, along with some 65 percent of all species 65 million years ago, is challenged in a paper to be reported in the Journal of the Geological Society on April 27, 2009. The crater, discovered in 1978 in northern Yucutan and measuring about 180 kilometers (112 miles) in diameter, records a massive extra-terrestrial impact........
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First Americans arrived as 2 separate migrations
The first people to arrive in America traveled as at least two separate groups to arrive in their new home at about the same time, as per new genetic evidence published online on January 8th in Current Biology, a Cell Press publication. After the Last Glacial Maximum some 15, 000 to 17, 000 years ago, one group entered North America from Beringia following the ice-free Pacific coastline, while another traversed an open land corridor between two ice sheets to arrive directly into the region east of the Rocky Mountains. (Beringia is the landmass that connected northeast Siberia to Alaska during the last ice age.) Those first Americans later gave rise to almost all modern Native American groups of North, Central, and South America, with the important exceptions of the Na-Dene and the Eskimos-Aleuts of northern North America, the scientists said........
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Watch Out! Some Pterosaurs Take Off
Pterosaurs have long suffered an identity crisis. Pop culture heedlessly - and wrongly - lumps these extinct flying lizards in with dinosaurs. Even paleontologists assumed that because the creatures flew, they were birdlike in a number of ways, such as using only two legs to take flight. Now comes what is thought to befirst-time evidence that launching some 500 pounds of reptilian heft into flight mandatory pterosaurs to use four limbs: two were ultra-strong wings which, when folded and balanced on a knuckle, served as front "legs" that helped the creature to walk - and leap........
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