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Re: why isn't Tethyshadros insularis just a juvenile?



Read the paper.

----- Original Message ----- From: "Denver Fowler" <df9465@yahoo.co.uk>
To: "DML" <dinosaur@usc.edu>
Sent: Monday, December 14, 2009 8:24 PM
Subject: why isn't Tethyshadros insularis just a juvenile?


Although the various specimens "lack evidence of osteological immaturity suggestive of a juvenile condition" (in the paleobiogeography section), I don't see where this is addressed elsewhere in the paper.

There is no histological analysis of the bones to attempt ID of an EFS, nor is the condition of neural arch fusion stated (although this is not entirely reliable as a maturity indicator anyway). Sacral count seems low for a hadrosauroid (consistent with juve status), and the skull seems unfused. Hence a non-juvenile status cannot be supported from the evidence presented.

A "mixture of derived... and primitive characters" is often a good indication of non-maturity in dinosaurs (as Padian said in his ?2007 or 2008? SVP talk). If indeed the specimen is a dwarf, then this may explain juvenile characters, but a dwarf adult should show an EFS and the paper does not address this.

Maybe this is addressed in the follow-up description of the postcrania.

----------------------------------
Denver Fowler
df9465@yahoo.co.uk
http://www.denverfowler.com
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----- Original Message ----
From: "heby@libero.it" <heby@libero.it>
To: dinosaur@usc.edu
Sent: Mon, 14 December, 2009 5:17:32
Subject: R: The new dinosaur Tethyshadros insularis


Here's some info:

http://news.discovery.com/dinosaurs/meet-antonio--a-new-
italian-dinosaur.html



Cheers,

Lukas Panzarin







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