Pergelangan kaki fosil menunjukkan primata bumi awal tinggal di pohon-pohon--T-REC-komunitas reptil-semarang--KSE-komunitas satwa eksotik

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Pergelangan kaki fosil menunjukkan primata bumi awal tinggal di pohon-pohon

Primata bumi awal telah mengambil step up  di dunia , sekarang bahwa para peneliti melihat pergelangan kaki mereka . Sebuah studi baru menemukan bahwa Purgatorius , mamalia kecil yang hidup dengan  diet buah dan serangga , adalah penghuni pohon . Ahli paleontologi membuat penemuan dengan menganalisis tulang pergelangan kaki 65 - juta tahun lalu  yang dikumpulkan dari situs di timur laut Montana ....read more

Fossil ankles
indicate Earth's earliest primates lived in trees

Date:

January 19, 2015

Source:

Yale University

Summary:

Earth's earliest
primates have taken a step up in the world, now that researchers have gotten a
good look at their ankles. A new study has found that Purgatorius, a small
mammal that lived on a diet of fruit and insects, was a tree dweller.
Paleontologists made the discovery by analyzing 65-million-year-old ankle bones
collected from sites in northeastern Montana.

.....................

earth's earliest
primates have taken a step up in the world, now that researchers have gotten a
good look at their ankles.

A new study has found that Purgatorius, a small mammal that
lived on a diet of fruit and insects, was a tree dweller. Paleontologists made
the discovery by analyzing 65-million-year-old ankle bones collected from sites
in northeastern Montana.

Purgatorius, part of an extinct group of primates called plesiadapiforms, first
appears in the fossil record shortly after the extinction of non-avian
dinosaurs. Some researchers have speculated over the years that primitive
plesiadapiforms were terrestrial, and that primates moved into the tree canopy
later. These ideas can still be found in some textbooks today.

"The textbook that I am currently using in my biological anthropology
courses still has an illustration of Purgatorius walking on
the ground. Hopefully this study will change what students are learning about
earliest primate evolution and will place Purgatoriusin the trees
where it rightfully belongs," said Stephen Chester, the paper's lead
author. Chester, who conducted much of the research while at Yale University
studying for his Ph.D., is an assistant professor at Brooklyn College, City
University of New York. Chester is also a curatorial affiliate at the Yale
Peabody Museum of Natural History.

Until now, paleontologists had only the animal's teeth and jaws to examine,
which left much of its appearance and behavior a mystery. The identification
of Purgatorius ankle bones, found in the same area as the
teeth, gave researchers a better sense of how it lived.

"The ankle bones have diagnostic features for mobility that are only
present in those of primates and their close relatives today," Chester
said. "These unique features would have allowed an animal such as Purgatorius to
rotate and adjust its feet accordingly to grab branches while moving through
trees. In contrast, ground-dwelling mammals lack these features and are better
suited for propelling themselves forward in a more restricted, fore-and-aft
motion."

The research provides the oldest fossil evidence to date that arboreality
played a key role in primate evolution. In essence, said the researchers, it
implies that the divergence of primates from other mammals was not a dramatic
event. Rather, primates developed subtle changes that made for easier
navigation and better access to food in the trees.

The research appears in the Jan. 19 online edition of the Proceedings
of the National Academy of Sciences.







Story Source:

The above story is based on materials provided by Yale
University. The original article was written by Jim Shelton. Note: Materials
may be edited for content and length.







Journal Reference:

1.    Stephen Gregory Benson Chester, Jonathan
I. Bloch, Doug M. Boyer, William A. Clemens. Oldest known euarchontan
tarsals and affinities of Paleocene Purgatorius to Primates. Proceedings
of the National Academy of Sciences, 2015;

http://www.sciencedaily.com/releases/2015/01/150119154509.htm







:p
�mr�/0�,m:.0001pt;line-height:
13.35pt;background:white'>The above story is based on materials provided by Virginia
Tech. Note: Materials may be edited for content and length.










Journal Reference:

1.    Sterling J. Nesbitt, Christian A. Sidor,
Kenneth D. Angielczyk, Roger M. H. Smith, Linda A. Tsuji. A new
archosaur from the Manda beds (Anisian, Middle Triassic) of southern Tanzania
and its implications for character state optimizations at Archosauria and
Pseudosuchia. Journal of Vertebrate Paleontology, 2014; 34 (6):
1357 DOI: 10.1080/02724634.2014.859622

http://www.sciencedaily.com/releases/2015/01/150120085619.htm

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