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Re: Leaellynasaura, Tails, and Integument



"anterior and dorsoventral elongation of
postzygapophyses"

Just to be sure: is that supposed to mean "elongated pre-, post- zygapophyses, and chevrons". Similar to the condition observable in Dromaeosauridae and Microraptoria?

Greets!
Torsten


----- Original Message ----- From: "Jocelyn Falconnet" <j.falconnet@gmail.com>
To: <tijawi@yahoo.com>
Cc: <dinosaur@usc.edu>
Sent: Monday, July 12, 2010 11:32 AM
Subject: Re: Leaellynasaura, Tails, and Integument


Pretty neat idea... except that the distal half of the tail was
stiffened by the anterior and dorsoventral elongation of
postzygapophyses - up to 44% of the vertebral length !! - according to
Herne (2009).

What seems incompatible with a curling behaviour such as seen in the
pangolin. Also, the pangolin uses its tail to protect its head and
belly because its body is covered dorsally by a number of alternating
flattened scales.Here, the presence of soft, keratinized scales does
not stiffened the body of the animal contrary to osteoderms which
tends to do so and are often associated to coossification of (e.g.:
armadillos, crocodiles, or turtles for extant taxa; aetosaurs and
other crurotarsians, placodonts, chronosuchians, or dissorophoid
temnospondyls for fossils).

Jocelyn Falconnet

2010/7/12 Tim Williams <tijawi@yahoo.com>:

Yes, the incredibly long tail combined with the suggestion of thyreophoran affinities, made me think of the pangolin (so-called 'scaly ant-eater'), which can curl itself into a ball with the long tail used to protect the head.


Cheers

Tim



--- On Fri, 9/7/10, Jaime Headden <qi_leong@hotmail.com> wrote:

From: Jaime Headden <qi_leong@hotmail.com>
Subject: Re: Leaellynasaura, Tails, and Integument
To: "Dinosaur Mailing List" <dinosaur@usc.edu>
Received: Friday, 9 July, 2010, 6:31 AM

Re: recent comments on the proposed tail length (70+
elements, 3/4 of
the body length being tail, etc.) of a referred specimen to

*Leaellynasaura amicagraphica* (Herne, SVP/JVP 29(supp to
3):113A) has prompted me to provide some
observations (such as the extremely long tails of some
other
ornithischians) here:
http://qilong.wordpress.com/2010/07/09/leaellynasaura-and-caudal-length-in-ornithischians/.




This follows treatments on the animal by Dann Pigdon and
Matt Matrynuick
here: http://home.alphalink.com.au/~dannj/leaell.htm and
here:
http://dinogoss.blogspot.com/2010/07/tall-tail.html
(respectively). It
should also be noted that Wikipedia, citing Herne's
abstract, not
present until very recently, has now updated:
http://en.wikipedia.org/wiki/Leaellynasaura . How swift
this information
spreads when publicized! Imagine how much more information
will spread
this season when blogging advances publicity of SVP and
SVPCA (and GSA)
later this year.

Cheers,

Jaime A. Headden
The Bite Stuff (site v2)
http://qilong.wordpress.com/

"Innocent, unbiased observation is a myth." --- P.B.
Medawar (1969)


"Ever since man first left his cave and met a stranger with
a
different language and a new way of looking at things, the
human race
has had a dream: to kill him, so we don't have to learn his
language or
his new way of looking at things." --- Zapp Brannigan
(Beast With a Billion Backs)





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--
Jocelyn Falconnet