Re: Sequential Centrosaurines, Batman!

[Christopher Taylor <ck.taylor@auckland.ac.nz>]

    By way of contrast, and of being a smartass :) - compare, e.g., the
South Island (_Philesturnus carunculatus_) and North Island (_P. rufusater_)
saddlebacks [birds] here in New Zealand, which are almost identical as
adults, but very different as juveniles.

    Cheers,

        Christopher Taylor

On 19/5/04 1:43 pm, "Jaime A. Headden" <qilongia@yahoo.com> wrote:

> Tim Williams (twilliams_alpha@hotmail.com) wrote:
> 
> <BTW, the diagnostic characters of _Brachyceratops_ are thought by some
> authors to be immature centrosaurine characters, and therefore invalid.
> Ditto for _Monoclonius_.  Thus, both genera are deemed invalid under this
> interpretation.>
> 
> Yes. However, juveniles _can_ exhibit diagnostic features, even if the
> juvenile condition cannot be compared to adults of other species (reducing
> their diagnostic utility). The actuality of the features that are present
> as unique in combination or existence, or as a dinosaur, ornithischian, or
> ceratopsian, etc., makes these features valuable and useful, even if the
> naming of the taxon is pushing it. Otherwise, *Chasmosaurus canadensis,*
> *Brachyceratops montanus,* and *Monoclonius crassus* are valid in their
> uniqueness, but hardly comparable to the adult types and almost completely
> adult hypodigms of other ceratopsians. Skulls referred to *Monoclonius*
> include the species *M. lowei* and *M. dawsoni,* the former which is
> distinct from both *Centrosaurus* and *Styracosaurus,* as well as other
> centrosaurines, based on its frill morphology, and indicate they are
> possible unique species, even if they may not validate the genus they were
> placed it.
> 
> =====
> Jaime A. Headden
> 
> Little steps are often the hardest to take.  We are too used to making leaps
> in the face of adversity, that a simple skip is so hard to do.  We should all
> learn to walk soft, walk small, see the world around us rather than zoom by
> it.
> 
> "Innocent, unbiased observation is a myth." --- P.B. Medawar (1969)
> 
> 
> 
> 
> __________________________________
> Do you Yahoo!?
> SBC Yahoo! - Internet access at a great low price.
> http://promo.yahoo.com/sbc/
>