RE: Hadrosaur nomenclature

[Paleo_Mont <paleo_mont@excite.com>]

never said they werent related, just not the same animal or genus.

Hmmm interesting if you Believe there isnt enough differences in the two or
if you just like to lump. You could also do the same with Campanion aged
Tyrannosaurs making them all Albertosaurs. Or anything else if one desired. 
:?)

K.Wicks
Paleo Mont







On Tue, 16 Oct 2001 14:10:40 -0400, tholtz@geol.umd.edu wrote:

>  
>  
>  > -----Original Message-----
>  > From: owner-dinosaur@usc.edu [mailto:owner-dinosaur@usc.edu]On Behalf
Of
>  > Paleo_Mont
>  > Sent: Tuesday, October 16, 2001 1:48 PM
>  > To: Dinogeorge@aol.com; dinosaur@usc.edu
>  > Subject: Re: Hadrosaur nomenclature
>  >
>  >
>  > Ok...guess I need to do something here, again.
>  >
>  > >Maiasaura = Brachylophosaurus<
>  > >I admit I don't know much about hadrosaurs, so maybe this is old, but
I
>  > haven't heard it before. What's the reasoning behind this
>  >
>  > >  Because the look similar. I'm not being smart. The Mor adult
Maiasaura
>  > skull is crushed dorsal-ventrally. ROM has a new uncrushed skull
>  > that really
>  > really looks like Brachylophosaurus without that crest in the back.
>  >
>  > Arg... Hello not that similiar. That specimen is not that new. 93/94/95
or
>  > so when it was acutally found. Is also, the same speciman that
>  > has the skin
>  > impressions that show a "waddle" (loose skin under the neck).
>  
>  "wattle".
>  
>  However, differences do not equal non-relation.  I believe that Jon
"Acolyte
>  of the Preisthood of Brett-Surman" Wagner is using a broad genus concept
in
>  this context: that is, the species previously assigned to the separate
>  genera _Maiasaura_ and _Brachylophosaurus_ are all included in a single
>  genus (which, by priority, would be _Brachylophosaurus_).  Jon did
similar
>  synonymizations in his poster presentation (i.e., _Anatotitan_ within
>  _Edmontosaurus_; _Prosaurolophus_ within _Saurolophus_; _Gryposaurus_
within
>  _Kritosaurus_; etc.).
>  
>  There does not exist such a thing as a "genericometer" which can give
>  independant confirmation that two species or specimens differ at the
"genus
>  level".  Thus inclusion or exclusion of a particular species from a genus
>  are matters of personal decision, although one hopes informed by
information
>  on population and ontogenetic variation, distribution, phylogenetic
>  position, preservation, sexual dimorphism, and the like.
>  
>               Thomas R. Holtz, Jr.
>               Vertebrate Paleontologist
>  Department of Geology                Director, Earth, Life & Time Program
>  University of Maryland               College Park Scholars
>               College Park, MD  20742
>  http://www.geol.umd.edu/~tholtz/tholtz.htm
>  http://www.geol.umd.edu/~jmerck/eltsite
>  Phone:       301-405-4084    Email:  tholtz@geol.umd.edu
>  Fax (Geol):  301-314-9661    Fax (CPS-ELT): 301-405-0796
>  



K.Wicks
Paleo Mont - www.geocities.com/paleo_mont
Paleo Mont Park - www.geocities.com/paleo_montpark





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