This website uses its own and third-party cookies. Some of these cookies are used to develop analytical statistics of visits to the webpage, others to manage advertising or even others are necessary for the correct management of the site. If you continue to browse or click in accept we consider you accept the conditions for their use. You can get more information, or learn how to change the settings in our cookies policy?
Versión Española Versión Mexicana Ibercampus English Version Version française Versione italiana

7/7/2020  
    Ibercampus  | Editorial Board | Who we are | Ideology | Contact | Advertising rates | Subscription | RSS RSS
Policies
Inclusion policies
R&D
Employment
Economics
Culture
Green strategies
Health
Society and consumer
Sports
Debates
Interviews
Education
Grants & internships
Training
Trends
Enterprises & CSR
 Enterprises & CSR
ACNUR
AEGON
AIR LIQUIDE
ALCATEL-LUCENT
ALLIANZ
ARCELORMITTAL
ASIFIN
ASSICURAZIONI GENERALI
AXA
BANCO SANTANDER
BASF
BAYER
BBVA
BNP PARIBAS
CARREFOUR
DAIMLER AG
DEUTSCHE BANK
DEUTSCHE BÖRSE
DEUTSCHE TELEKOM
E.ON
ENEL
ENI
FORTIS
FRANCE TÉLÉCOM
GROUPE DANONE
IBERDROLA
INDITEX
ING GROUP
INTESA SANPAOLO
L'ORÉAL
LVMH
MUNICH RE
NOKIA
PHILIPS
RENAULT
REPSOL YPF
RWE
SAINT GOBAIN
SANOFI-AVENTIS
SAP AG
SCHNEIDER ELECTRIC
SIEMENS AG
SOCIÉTÉ GÉNÉRALE
SUEZ
TELECOM ITALIA
TELEFÓNICA
TOTAL S.A.
UNICREDIT
UNILEVER
VINCI
VIVENDI
VOLKSWAGEN

R&D
Turtles in Europe during the Jurassic Period

First European sea turtles became extinct due to changing sea levels


In 2009 a team of scientists found the remains of what was, until then, the oldest turtle species in southern Europe at 160 million years old. But by reinterpreting the fossils, a Spanish researcher has proved that it is not a new species, but a group of very diverse turtles in Europe during the Jurassic Period, which disappeared due to changing sea levels.
Ibercampus 23/3/2015 Send to a friend
Comparte esta noticia en TwitterFacebookTwitterdel.icio.usYahooRSS
Little is known about the oldest sea turtles that inhabited the Earth millions of years ago. The finding in the Baetic Cordillera, in Jaén, of the remains of a supposed new species of turtle, Hispaniachelys prebetica – considered the oldest in southern Europe – brought new clues six years ago. However, it was still not clear what group the primitive turtle belonged to.

Some of the characteristics of Hispaniachelys prebetica were no different from turtles of the Plesiochelyidae group
To resolve the matter, Adán Pérez-García, a researcher in the Evolutionary Biology group of the UNED, studied the as-yet-unanalysed fossils of the specimen, reinterpreted some of its features and provided new information on the morphology of these reptiles. The results marked a radical shift in fossil interpretation.

As Pérez-García clarifies for SINC: “Hispaniachelys prebetica cannot be recognised as a valid species. Nevertheless, it is identified as a member of a group of turtles exclusive to the European Jurassic called Plesiochelyidae, which were very diverse.”

The study, published in ‘Acta Palaeontologica Polonica’, demonstrates that some of the characteristics of Hispaniachelys prebetica, such as the relatively large carapace, were no different from turtles of the Plesiochelyidae group. However, due to the scarce information about this, the only example, “the specimen is reinterpreted as an indeterminate member of this group of turtles,” the study expounds.

According to the researcher, “Hispaniachelys prebetica is no longer deemed a valid name but is now what is technically known as nomen dubium,” and he adds that a more precise classification ‘Indeterminate Plesiochelyidae’ is not possible. “This specimen is an indeterminate species of Plesiochelyidae, which could be one of the other previously defined species,” the scientist asserts.

Around 160 million years ago, in countries such as the United Kingdom, France, Switzerland, Germany, Portugal and Spain, a group of primitive turtles lived called Plesiochelyids, which “do not resemble any currently existing turtle”, the expert continues. In Spain there were several species, many of them recently identified, on which there is abundant material. Now, with the identification of the specimen in Jaén, the record expands to attribute it to this group.

These European reptiles inhabited warm, shallow seas of the continent, but “they were not as agile in this environment as today’s sea turtles, who are able to cover very large distances and cross seas and even oceans,” the expert explains. “Due to their anatomy, these Jurassic turtles were restricted to coastlines.”

Because of their dependency on coastal environments, the changes in the sea level which occurred at the end of the Jurassic period – around 145 million years ago – had a drastic impact upon the environments they lived in. As a result, “these turtles, in addition to other groups of sea reptiles, became extinct at that time,” Pérez-García confirms.

Through several projects he is carrying out at the Geology Centre at the University of Lisbon (Portugal) and the UNED, the researcher continues working on reviewing Plesiochelyidae on the Iberian Peninsula and other regions in Europe. “We are attempting to discover the real diversity in the fossil record of this, until now, little-known group,” he concludes.

Source: SINC

Other issues R&D
China, Germany, Japan, Korea and the United States dominate global innovation - WIPO report 2019
New methodology developed to monitor patients with glioblastoma
Scientists find a place on Earth where there is no life
The embryonic origin of the Cyclops eye
Graphene activates immune cells helping bone regeneration in mice
Jurassic dinosaurs could have been dispersed between Africa and Europe 145 years ago
China´s Chang´e-4 probe lands on the moon
Artificial intelligence for studying the ancient human populations of Patagonia.
Chinese and European scientists propose 28 complementary colours
EU-wide rules for safety of drones approved by European Parliament

Subscribe free to our newsletter
Human Capital
Mobilizing commitment around change
Marta Santos Romero
Vanity Fea
Let´s get serious with Coronavirus
José Ángel García Landa
We can all be leaders
VIDEOCOMMUTING A NEW ORGANIZATIONAL REALITY THAT POSITIVELY IMPACTS EMPLOYEES
Mar Souto Romero
Financial inclusion
Financial Education For All!
Carlos Trias
Brusselian Lights
European elections (I): which words are more used in the European political manifestos?
Raúl Muriel Carrasco
Humor and Political Communication
Comisión de Arbitraje, Quejas y Deontología (Spain) (3) You can´t be too careful
Felicísimo Valbuena
Want your own blog? Want to be read by universities?
Find out here
Books
"Tthe study of human behaviour was political from the beginning"
The EU "An Obituary"
Startup Cities "Why Only a Few Cities Dominate the Global Startup Scene"
Blockchain Revolution "How the Technology Behind Bitcoin and Cryptocurrency Is Changing the World "
Doughnut Economics "Seven Ways to Think Like a 21st-Century Economist "
The People vs Tech "How the Internet Is Killing Democracy"
Theses and dissertations
1 Mobilizing commitment around change
Legal Advise | Privacy Policy | Editorial Board | Who we are | Ideology | Contact | Advertising rates | RSS RSS