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Re: SVP Preview

In a message dated 9/27/02 10:14:46 AM Pacific Daylight Time, 
mightyodinn@yahoo.com writes:

<< This is if you are going by ICZN rules, and consider these taxa to be
 superfamilies. I you consider them rankless clades, then _Spinosauroidea_ 
has a
 phylogenetic definition, and Megalosauroidea, does not, making it unavailable
 for comparison. >>

Afaik, ICZN does not recognize phylogenetic definitions, but it does govern 
family level taxa. The ending -oidea is standard for superfamilies, making 
Megalosauroidea and Spinosauroidea both family level taxa subject to ICZN 
rules of synonymy. Even if the clades are rankless, the name Megalosauroidea 
has priority over Spinosauroidea, so that when Spinosauroidea was 
phylogenetically defined, it was really Megalosauroidea that was being given 
the definition.