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Re: Ichthyovenator



Was there a calculated size estimation in the paper? I can't restrain
myself in asking about size estimates when talking about spinosaurids.

>> Date: Sun, 22 Apr 2012 15:24:14 -0700
>> From: bcreisler@gmail.com
>> To: dinosaur@usc.edu
>> Subject: Ichthyovenator, new spinosaurid from Early Cretaceous of Laos
>>
>> From: Ben Creisler
>> bcreisler@gmail.com
>>
>> A new online paper:
>>
>> Ronan Allain, Tiengkham Xaisanavong, Philippe Richir and Bounsou
>> Khentavong (2012)
>> The first definitive Asian spinosaurid (Dinosauria: Theropoda) from
>> the Early Cretaceous of Laos.
>> Naturwissenschaften (advance online publication)
>> 2012, DOI: 10.1007/s00114-012-0911-7
>> http://www.springerlink.com/content/r5x213648388tt23/
>>
>>
>> Spinosaurids are among the largest and most specialized carnivorous
>> dinosaurs. The morphology of their crocodile-like skull, stomach
>> contents, and oxygen isotopic composition of the bones suggest they
>> had a predominantly piscivorous diet. Even if close relationships
>> between spinosaurids and Middle Jurassic megalosaurs seem well
>> established, very little is known about the transition from a
>> generalized large basal tetanuran to the specialized morphology of
>> spinosaurids. Spinosaurid remains were previously known from the Early
>> to Late Cretaceous of North Africa, Europe, and South America. Here,
>> we report the discovery of a new spinosaurid theropod from the late
>> Early Cretaceous Savannakhet Basin in Laos, which is distinguished by
>> an autapomorphic sinusoidal dorsosacral sail. This new taxon,
>> Ichthyovenator laosensis gen. et sp. nov., includes well-preserved and
>> partially articulated postcranial remains. Although possible
>> spinosaurid teeth have been reported from various Early Cretaceous
>> localities in Asia, the new taxon I. laosensis is the first definite
>> record of Spinosauridae from Asia. Cladistic analysis identifies
>> Ichthyovenator as a member of the sub-clade Baryonychinae and suggests
>> a widespread distribution of this clade at the end of the Early
>> Cretaceous. Chilantaisaurus tashouikensis from the Cretaceous of Inner
>> Mongolia, and an ungual phalanx from the Upper Jurassic of Colorado
>> are also referred to spinosaurids, extending both the stratigraphical
>> and geographical range of this clade.
>