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RE: [dinosaur] New Konzhukovia species (temnospondyl) from Permian of South America + Early Triassic polar coprolites + more papers



As far as I can tell, the ICZN only says (in Article 75.5) that "When an author 
considers that the taxonomic identity of a nominal 
species-group taxon cannot be determined from its existing name-bearing 
type (i.e. its name is a nomen dubium), and stability or 
universality are threatened thereby, the author may request the 
Commission to set aside under its plenary power [Art. 81] the existing 
name-bearing type and designate a neotype."  Nothing about 'should' or 'need', 
but rather 'may'.  Since "stability and universality" of Deinodontidae as used 
in the mid twentieth century was not threatened by Deinodon being a nomen 
dubium compared to albertosaurines and Daspletosaurus, I don't think Russell 
needed to designate a neotype.  What Russell was wrong to do ICZN-wise was to 
drop Deinodontidae because of Deinodon being indeterminate.

As for your obsolescence idea about Microraptor, I agree.  Alas, I think it's 
only a matter of time until someone who ignorantly thinks family-based taxa 
can't be based onm nomina dubia petitions the ICZN to designate a Microraptor 
neotype.  Maybe to make M. gui the type species.  Which is extra ironic since 
Senter explicitly named Microraptoria to not be beholden to the ICZN, but 
multiple authors after that couldn't abide by such a name and coined or tried 
to coin Microraptorinae.

Mickey Mortimer

________________________________
> Date: Fri, 15 Apr 2016 07:59:03 -0400 
> From: martyniuk@gmail.com 
> To: mickey_mortimer111@msn.com 
> CC: dinosaur-l@usc.edu 
> Subject: Re: [dinosaur] New Konzhukovia species (temnospondyl) from  
> Permian of South America + Early Triassic polar coprolites + more  
> papers 
>  
> I think it's worth pointing out, in a discussion about nomena dubia,  
> that the ICZN says nomena dubia *should not be allowed to exist*. It is  
> pretty clear that if the type specimen of a species is found to be  
> indeterminate, by taxonomic obsolescence or otherwise, a neotype needs  
> to be designated in order to preserve stability. Deinotontidae was in  
> use for nearly 100 years and Deinodon treated as valid (often as a  
> synonym of Gorgosaurus) during much of that time. IIRC, in the 1970s,  
> it was Dale Russel's work on deinodontids/tyrannosaurids that concluded  
> Deinodon was a nomen dubium, and therefore taxonomy based on it was  
> also invalid. This was pre-PN and a blatant disregard for the ICZN.  
> Russel should have chosen a neotype from available comparable  
> specimens, and had a great opportunity to do so since he simultaneously  
> spun off a new taxon from the Deinodon/Gorgosaurus complex:  
> Daspletosaurus. If Russell had followed the rules instead of taking the  
> opportunity to coin a new name, we wouldn't be in the current situation  
> of having to selectively ignore the rules we've got in this instance.  
> Neotypes are rare in paleontology and we've got hundreds of nomena  
> dubia to show for it. 
>  
> I guess my point is that one generation's concept of stability and  
> commonly-used names are often the result of past instability and  
> coining of new names for old taxa by a very few but very prominent  
> researchers in the past. We can choose to either have stability in our  
> nomenclature, or "go with the flow" of whatever name is trendy today  
> and accept generational turnover in nomenclature, but anybody who  
> chooses the latter has abandoned their right to ever criticize anyone  
> for not using the "correct" nomenclature, because "correct" becomes  
> whatever the personal preference of the top celebrity researchers  
> happens to be that decade. 
>  
> Matt 
>  
> On Fri, Apr 15, 2016 at 4:08 AM, Mickey Mortimer  
> <mickey_mortimer111@msn.com<mailto:mickey_mortimer111@msn.com>> wrote: 
> Tim Williams wrote- 
>  
> > Frankly, yes. Subjective it may be, but arbitrary it is not. The 
> > 'subjective' determination is based on scientific expertise and 
> > experience. In my view, that trumps the arbitrary rules of the ICZN, 
> > which only avers that the family that was named first gets priority. 
> > 
> > When defining a clade with the eponymous genus as the specifier, it's 
> > best to use a genus that is actually valid. I know 'validity' is 
> > sometimes in the eye of the beholder. But for _Deinodon_, I don't 
> > know of anyone who thinks it's valid. So I can't see any reason why 
> > Deinodontoidea should supplant Tyrannosauroidea. 
> > 
> > I understand your Spinosauroidea/Torvosauroidea/Megalosauroidea 
> > example... yes, Megalosauroidea eventually won out. After all, it has 
> > priority. Recent studies support _Megalosaurus_ as a valid genus, so 
> > I've got no problem with clade Megalosauroidea. 
>  
> But Megalosaurus was often viewed as indeterminate prior to Benson et  
> al.'s (2008) restudy (e.g. Rauhut, 2000; Allain and Chure, 2002) back  
> when only the lectotype dentary was referred because it was thought  
> multiple large theropods were preserved at Stonesfield Slate  
> (Morphotypes A and B, etc.).  So if we were having this discussion  
> then, you'd say no one should resurrect Megalosauroidea because we  
> already have a good definition for Spinosauroidea.  But now you're fine  
> with it.  Don't you note the inconsistency?  If we find a supposed  
> nomen dubium is valid in the future, then do we have to change the  
> clade name?  Or are we in a special time where whatever the consensus  
> is for validity for every taxon now is seen as binding?  Or do you not  
> even care, and figure we'll just go with the flow of whatever feels  
> right for each situation? 
>  
> And choosing diagnosability is just as arbitrary as anything else.  WHY  
> should specifiers of clades be diagnostic?  What's the downside if  
> they're not?  And before you say it again, no you don't have to include  
> a nomen dubium in a quantified phylogenetic analysis in order to  
> determine its relationships.  You look where the taxa are that it can't  
> be distinguished from, and that range of the cladogram is where it  
> goes. 
>  
> > Of course, we could just have names like Megalosauria, Tyrannosauria, 
> > Oviraptoriformes, Caenagnathia, Caenagnathiformes, etc (and avoid the 
> > suffix -oidea), which would bypass ICZN altogether. 
>  
> And destroy historical continuity, plus disrespect the people who named  
> each family-level clade.  Though of those, only Caenagnathia doesn't  
> already exist. 
>  
> > Yep, I'm aware there's no consensus regarding the 'standard' 
> > definition of many clades. Aves is a famous/infamous example. I 
> > agree that PhyloCode should solve these sorts of problems. But having 
> > coordinated family-level taxa governed by ICZN rules just adds an 
> > additional (and unnecessary) layer of complication. 
>  
> It doesn't complicate, it organizes.  It's another layer of rules, but  
> if you always follow all the rules you'll get a definite answer.  And  
> if you don't like that answer, you can petition.  I don't get why you  
> prefer a system where everyone just sorta goes with what they want, and  
> if a consensus forms great, but if one doesn't no one's actually  
> wrong.  Is is selfishness of wanting to use the names you like,  
> laziness of not wanting to work through the rules, an anti-authority  
> grudge of thinking we deserve unlimited power over the system? 
>  
> Mickey Mortimer 
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