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RE: Dollodon status questioned

David Marjanovic wrote:

<"[N]omen dubium" means "indistinguishable from two or more species that are 
distinguishable from each other".>

  Where is this definition written down? The ICZN, the only governing authority 
currently standing that mentions the term, only says:

  "A Latin term meaning [']a name of unknown or doubtful application[']."

  I understand that Mickey has argued that it _should_ be the above definition, 
and I agree with that, but the term itself has a historical _usage_, and a 
definition with an extremely vague application. Again, see 


Jaime A. Headden
The Bite Stuff (site v2)

"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 

> Date: Fri, 25 Mar 2011 11:05:32 +0100
> From: david.marjanovic@gmx.at
> To: dinosaur@usc.edu
> Subject: Re: Dollodon status questioned
> Rescued from truncation:
> > From McDonald's (2011) abstract...
> >
> > "Firsthand examination of the holotypes of the two taxa and numerous other =
> > basal iguanodont specimens=2C as well as a principal components analysis of=
> > basal iguanodont dentaries=2C did not find any morphological features to j=
> > ustify the distinction of Dollodon from Mantellisaurus. Dollodon bampingi i=
> > s thus best considered a nomen dubium and junior synonym of Mantellisaurus =
> > atherfieldensis."
> >
> > I have no opinion of the validity of Dollodon=2C but people have to learn w=
> > hat nomen dubium means. Dollodon can be a junior synonym of Mantellisaurus=
> > or it can be a nomen dubium=2C but it can't be both.
> > /rant
> >
> > Mickey Mortimer
> To spell it out, "nomen dubium" means "indistinguishable from two or
> more species that are distinguishable from each other". If *Dollodon
> bampingi* is indistinguishable only from *Mantellisaurus
> atherfieldensis*, it is not a nomen dubium.