Dengan gigi seperti itu , pra - dinosaurus vegetarian ini tidak ada dorongan lebih--T-REC-komunitas reptil-semarang--KSE-komunitas satwa eksotik

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Dengan gigi seperti itu , pra - dinosaurus  vegetarian ini  tidak ada dorongan lebih

Head-butting  dan canine display  selama pertempuran – antar jantan  pertama kali muncul sekitar 270 juta tahun yang lalu

Date:

July 15, 2015

Source:

University of the Witwatersrand

Summary:

Head-butting  dan canine display  selama pertempuran – antar jantan  pertama kali muncul sekitar 270 juta tahun yang lalu . Ini adalah apa yang peneliti temukan ketika mereka melakukan update studi mendalam dari leluhur mamalia herbivora , Tiarajudens eccentricus , yang ditemukan empat tahun lalu .

.............. Mereka juga belajar bahwa 270 juta tahun yang lalu , pertempuran antarspesies dan pertempuran yang kita lihat antara rusa jantan hari ini sudah hadir di pelopor  mamalia ini  .

Deskripsi ini oleh peneliti Brasil , Dr Juan Carlos Cisneros , dan rekan - penulis dari Studi Evolusi Institute di University of Witwatersrand , Profesor Fernando Abdala dan Dr Tea Jashasvili , diterbitkan dalam sebuah artikel yang berjudul : Tiarajudens eccentricus dan Anomocephalus africanus , dua anomodonts aneh ( Sinapsida , therapsida ) dengan oklusi gigi dari Permian of Gondwana di jurnal , Royal Society Open Science , pada 15 Juli 2015 .

Gigi-Saber  diketahui milik gorgonopsians predator Permian besar ' ( juga dikenal sebagai reptil bertaring gigi-saber ) , dan kucing bertaring gigi-saber  terkenal dari Zaman Es ....more

With teeth like
that, this pre-dinosaur vegetarian was no push over

Head-butting and canine display during male-male combat first appeared some
270 million years ago

Date:

July 15, 2015

Source:

University of the Witwatersrand

Summary:

Head-butting and canine display during male-male combat first appeared some
270 million years ago. This is what researchers found when they conducted an
updated in-depth study of the herbivorous mammalian ancestor, Tiarajudens
eccentricus, discovered four years ago.

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

Discovered four years ago, and following an updated and more in-depth study
of the herbivorous mammalian ancestor,Tiarajudens eccentricus,
researchers from Brazil and South Africa can now present a meticulous
description of the skull, skeleton and dental replacement of this Brazilian
species.

They also learned that 270 million years ago, the interspecific combat and
fighting we see between male deer today were already present in these
forerunners of mammals.

This description by Brazilian researcher, Dr Juan Carlos Cisneros, and his
co-authors from the Evolutionary Studies Institute at the University of the
Witwatersrand, Professor Fernando Abdala and Dr Tea Jashasvili, is published in
an article, titled: Tiarajudens eccentricus and Anomocephalus
africanus, two bizarre anomodonts (Synapsida, Therapsida) with dental
occlusion from the Permian of Gondwana in the journal,Royal Society Open
Science, on 15 July 2015.

Saber-teeth are known to belong to the large Permian predators' gorgonopsians
(also known as saber-tooth reptiles), and in the famous saber-tooth cats from
the Ice Age.

When Tiarajudens eccentricus was discovered it had some
surprises install: Despite large protruding saber-tooth canines and occluding
postcanine teeth, it was an herbivore. The discovery of this Brazilian species
also allowed for a reanalysis of the South African species Anomocephalus
africanus, discovered 10 years earlier. The two species have several
similar features that clearly indicated they are closely related but the
African species lack of the saber-tooth canines of its Brazilian cousin. In the
Middle Permian, where these Gondwana cousins were living, around 270 million
years ago, the first communities with diverse, abundant tetrapod herbivores were
evolving.

In deer today enlarged canines are used in male-male displays during
fighting. The long canine in the herbivore T. eccentricusis
interpreted as an indication of its use in a similar way, and is the oldest
evidence where male herbivores have used their canines during fights with
rivals.

"It is incredible to think that features found in deer such as the
water deer, musk deer and muntjacs today were already represented 270 million
years ago," says Cisneros.

The researchers found the Tiarajudens' marginal teeth are also located in a
bone from the palate called epipterygoid. "This is an extraordinary
condition as no other animal in the lineage leading to mammals show marginal
dentition in a bone from the palate," says Abdala.

In another group of mammal fossil relatives, dinocephalians -- that lived
at the same time as anomodonts, some of the bones in their foreheads were
massively thickened. This can be interpreted as being used in head-butting
combat, a modern behaviour displayed by several deer species today.

"Fossils are always surprising us. Now they show us unexpectedly that
270 million years ago two forms of interspecific combat represented in deer
today, were already present in the forerunners of mammals," says Cisneros.







Story Source:

The above post is reprinted from materials provided byUniversity
of the Witwatersrand. Note: Materials may be edited for content
and length.







Journal Reference:

1.   
Juan Carlos Cisneros, Fernando Abdala, Tea Jashashvili, Ana de Oliveira
Bueno, Paula Dentzien-Dias. Tiarajudens eccentricusandAnomocephalus
africanus, two bizarre anomodonts (Synapsida, Therapsida) with dental occlusion
from the Permian of Gondwana. Royal Society Open Science, 2015;
2 (7): 150090 DOI:10.1098/rsos.150090

http://www.sciencedaily.com/releases/2015/07/150715112608.htm

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