[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Eoabelisaurus - almost complete Aalenian-Bajocian abelisaurid.



Diego Pol & Oliver W. M. Rauhut (2012) A Middle Jurassic abelisaurid from 
Patagonia and the early diversification of theropod dinosaurs. Proc. R. Soc. B 
rspb20120660; published ahead of print May 23, 2012, 1471-2954

Abstract = Abelisaurids are a clade of large, bizarre predatory dinosaurs, most 
notable for their high, short skulls and extremely reduced forelimbs. They were 
common in Gondwana during the Cretaceous, but exceedingly rare in the Northern 
Hemisphere. The oldest definitive abelisaurids so far come from the late Early 
Cretaceous of South America and Africa, and the early evolutionary history of 
the clade is still poorly known. Here, we report a new abelisaurid from the 
Middle Jurassic of Patagonia, Eoabelisaurus mefi gen. et sp. nov., which 
predates the so far oldest known secure member of this lineage by more than 40 
Myr. The almost complete skeleton reveals the earliest evolutionary stages of 
the distinctive features of abelisaurids, such as the modification of the 
forelimb, which started with a reduction of the distal elements. The find 
underlines the explosive radiation of theropod dinosaurs in the Middle Jurassic 
and indicates an unexpected diversity of ceratosaurs at that time. The apparent 
endemism of abelisauroids to southern Gondwana during Pangean times might be 
due to the presence of a large, central Gondwanan desert. This indicates that, 
apart from continent-scale geography, aspects such as regional geography and 
climate are important to reconstruct the biogeographical history of Mesozoic 
vertebrates.



http://rspb.royalsocietypublishing.org/content/early/2012/05/17/rspb.2012.0660.abstract



Cheers
Brian



Museums Board of Victoria ABN 63 640 679 155 is endorsed as a Deductible Gift 
Recipient.
All gifts of $2 or more are tax deductible.


[cid:imageaf3b7d.jpg@bb02cd33.ef464ee4]

Melbourne Museum
Major Tourist Attraction
museumvictoria.com.au<http://museumvictoria.com.au/>

This e-mail is solely for the named addressee and may be confidential. You 
should only read, disclose, transmit, copy, distribute, act in reliance on or 
commercialise the contents if you are authorised to do so. If you are not the 
intended recipient of this e-mail, please notify 
postmaster@museum.vic.gov.au<mailto:npostmaster@museum.vic.gov.au> by email 
immediately, or notify the sender and then destroy any copy of this message. 
Views expressed in this email are those of the individual sender, except where 
specifically stated to be those of an officer of Museum Victoria. Museum 
Victoria does not represent, warrant or guarantee that the integrity of this 
communication has been maintained nor that it is free from errors, virus or 
interference.
Please consider the environment before printing this email.


* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*         ---REMAINDER OF MESSAGE TRUNCATED---            *
*     This post contains a forbidden message format       *
*  (such as an attached file, a v-card, HTML formatting)  *
*    This Mail List at USC.EDU only accepts PLAIN TEXT    *
* If your postings display this message your mail program *
* is not set to send PLAIN TEXT ONLY and needs adjusting  *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

--_002_FD0FCA1296784949899C8D4F9DB5231201023E355FRAKALImvvicgo_";--