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taxonomy
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by hapkidocrochunter on January 29, 2008
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I have had this question for a while, and I have emailed it to various people, and no one is able (or wants to) answer me.
My question is regarding the names, and changes in the names.
The (from what I have heard) C. viridis is no longer a species with sub species right? So no more C. v. viridis, its just C. viridis.
In turn, that changed the names off all the praire sub species (C. v. abyssus etc) sorry for the mis spelled words, I am running late for class.
The viridis was changed out to "organus" ??
Was this due to dna analysis?
Also, a professor here at GCC in AZ, wrote in Copia, about the panamint rattler (C. m. stephensii) being its own species now. but it still has the speckled name.
Why didn't this name change? When the az black was found to be its own species, the name was changed to just C. cerberus??
Sorry if this is confusing, I would just like to know.
thanks
matt
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RE: taxonomy
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by pH on January 29, 2008
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"The (from what I have heard) C. viridis is no longer a species with sub species right? So no more C. v. viridis, its just C. viridis."
Correct. C. viridis is the only taxa under the viridis name now. C. v. nuntius was suppressed and lumped in with C. v. viridis so there is no more nuntius nor any other viridis species, just C. viridis
"In turn, that changed the names off all the praire sub species (C. v. abyssus etc) sorry for the mis spelled words, I am running late for class. The viridis was changed out to "organus" ??"
All the other subspecies under viridis have been moved to the species oreganus. Some list cerberus as a full species in its own though.
So here is what it is now with what they were on the right:
Crotalus viridis = Crotalus viridis + C. v. nuntius
Crotalus o. oreganus = Crotalus v. oreganus
Crotalus o. abyssus = Crotalus v. abyssus
Crotalus cerberus = Crotalus v. cerberus or Crotalus o. cerberus
Crotalus o. concolor = Crotalus v. concolor
Crotalus o. helleri = Crotalus v. helleri + C. v. caliginis
Crotalus o. lutosus = Crotalus v. lutosus
"Was this due to dna analysis?"
Yes, see Dr. Wuster's site for some of the papers. It showed that the viridis complex formed two distinct clades (thus viridis and oreganus) with cerberus also branching off (thus, some regard cerbs as it's own species)
"Also, a professor here at GCC in AZ, wrote in Copia, about the panamint rattler (C. m. stephensii) being its own species now. but it still has the speckled name.
Why didn't this name change? When the az black was found to be its own species, the name was changed to just C. cerberus??"
Change isn't always accepted quickly nor without a fight. If the Panamint paper becomes more widely accepted, you will see Panamints become C. stephensi... no mitchelli.
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RE: taxonomy
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by Cro on January 29, 2008
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Matt, I would suggest you check out Dr. Wolfgang Wuster`s site for more information as to why the western rattlesnakes were re-classified.
It was based on a mtDNA phylogeographic approach. You can download a pdf file of the research there.
See the following:
http://biology.bangor.ac.uk/~bss166/Updates/Crotalinae2002.htm
http://biology.bangor.ac.uk/~bss166/Updates/Crotalinae2000.htm
http://biology.bangor.ac.uk/~bss166/Updates/Crotalinae2001.htm
Hope this helps !
Best Regards JohnZ
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