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RE: Rattlesnake species
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by Cro on December 11, 2007
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soberwolf, if you expect an answer here to your question, then take the trouble to fill out your profile.
Otherwise, Google your question.
JohnZ
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RE: Rattlesnake species
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by GREGLONGHURST on December 12, 2007
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This will probably not be a complete answer, but I can think of a couple. The rattle on Sistrurus is always proportionately smaller...thinner, actually, than Crotalus. The scales on the top of the head (forward portion) are totally different. Crotalus has small scales, whereas Sistrurus has large plates, as do colubrids.
In your line of work, as in mine (land survey), it is good to have a working knowledge of the snakes of the local area.
~~Greg~~
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RE: Rattlesnake species
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by tj on December 12, 2007
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Yep, sistrurus have 9 plate-like scales on their heads. They also have differences in genitalia that seperate the two genus.
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RE: Rattlesnake species
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by Buzztail1 on December 12, 2007
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Not that long ago, the differences between Crotalus and Sistrurus became much more difficult.
The nine plates on the top of Sistrurus heads was a great way to tell them from the Crotalus group which has many smaller scales.
However, DNA testing places the Sistrurus ravus group closer to the rest of Crotalus than the rest of the Sistrurus group.
So, Sistrurus ravus became Crotalus ravus, even though the ravus group has the nine plates on the top of the head.
For now, Sistrurus miliarius (ssps) and Sistrurus catenatus (ssps) can be told apart from Crotalus within their ranges by the nine plates on top of their heads. They can be told apart from Crotalus ravus by range mapping. At least until someone else does a DNA study that shows that Sistrurus miliarius is more closely related to Agkistrodon than they are to Sistrurus catenatus ...
R/
Karl
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RE: Rattlesnake species
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by soberwolf on December 12, 2007
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Wow!!! I have recieved alot of info on my Q...Thanks again folks. Born and raised in Az. I get alot of oppertunities to observe the local wildlife. I try to learn as much as I can to help inform others. Rid the stereotypes and help alleiviate their fears. Mostly What we find in this area are, Atrox, Scutes and Black tail. And of course lots of Scorpion and fall Trantula. Again I find wildlife absolutely fascinating and apreciatethe valuble info I've recieved here. Thanks
S.T.
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RE: Rattlesnake species
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by ChuckHurd on December 13, 2007
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i haven't reviewed the test results, but i heard that some recent dna testing showed the southeastern pygs to be closer relatied to copperheads then the bigger rattlesnakes. any on here hear of that? anyone have access to the report?
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RE: Rattlesnake species
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by soberwolf on December 13, 2007
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I could really stir it up and ask sub species diff's. Viridis, Horridus ect. but I won't L.O.L.
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