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Most venomous/toxic Naja species in the world? I have read that the Philippine cobra is the most venomous (mice, 0.2 mg/kg SC with the lowest reported value being 0.14 mg/kg SC) (Brown, 1973). I have recently, come across something in the Indian Journal of Experimental Biology (Vol. 30, (issue 12), pages: 1158-1162, 1992) which stated that the LD50 for Naja oxiana was the most toxic/venomous (mice, 0.18 mg/kg SC and lowest reported value was 0.10 mg/kg). Along with that, the mortality rate for untreated Naja oxiana bites are the highest among all Naja species (70-80%). N.oxiana also produced the lowest known lethal dose (LCLo) of 0.005 mg/kg, the lowest among all cobra species ever recorded, derived from an individual case of poisoning by intracerebroventricular injection.
Following N. oxiana and N. philippinensis are N. melanoleuca at 0.225 mg/kg SC and then N. samarensis at 0.23 mg/kg. The water cobras (N. annulata and N. christyi also have very toxic venoms, but no SC values are listed. Only intraperitoneal (IP) values of 0.143 mg/kg for N. annulata and 0.12 mg/kg for N. christyi. IP values tend to be generally lower (more toxic than subcutaneous values, so it would be unfair to compare their IP results to the subcutaneous (SC) results of other Naja species. Then I have heard that (without solid evidence) that Naja nivea is the most venomous, although their murine SC LD50 range anywhere from 0.4 mg/kg (Toxicon, Vol. 5, issue 1, page 47, 1967) to 0.72 mg/kg (Australian venoms and toxins Databse).
So which is the most venomous? To me it seems obvious that it is the Caspian or Oxus cobra (Naja oxiana), followed by the Philippine cobra (Naja philippinensis). What do you think or know?
I've noticed that the Australian venom and toxin Database seems to have higher LD50 values for all snakes across the board. For example, for the black mamba IP value of 0.01 mg/kg is listed (http://www.sciencedirect.com/science/article/pii/004101018890219X) and Ernst and Zug et al 1996, list a SC value of 0.05 mg/kg for the black mamba. While the Australian venom and toxin Database listed much less toxic LD50's. So there seems to be a lot of variation.
2014-01-23
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2013-11-13
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2013-09-16
IF the science of self-immunization for a snake envenomation was proven/perfected what is the least benefit(percentage) you would accept before practicing it on yourself?
2013-06-06
how did you learn to keep venomous reptiles?
2013-03-02
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If you could have a great snake adventure,only in the USA where would it be?
  Posted: Aug 27, 2008
  (110 votes, 14 comments)
by pictigaster1
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Survey Results
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Texas, Mottled rocks
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6% (7)
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New Mexico, Banded rocks
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22% (24)
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Arizona, Tigers rattlers
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15% (16)
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Florida, Eastern diamondbacks
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41% (45)
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OTHER
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16% (18)
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Survey Comments
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Been on all four
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Well I have worked with lepidus in Mexico, NM, and Texas....looked for Mojaves in Arizona, had some fun looking for cottonmouth and easterns in Florida....so I guess I would like to see what the Appalachans have to offer...
Posted by
DarthCane
on January 19, 2010
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US Herp Trip
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I chose Texas Mottled Rocks, as I have tried once to view them in nature without any luck. We we're in the Big Bend region of Texas and the only rattlesnake we saw was the Western Diamondback.We did see some other interesting snakes from the region like the Trans Pecos Ratsnakes,Great Plains Ratsnake, Baird's Ratsnake,Longnose Snake, Gopehersnake, a form of Coachwhip and the Chihuahan Hooknosed Snake. Also I would like to life list the Transpecos Copperhead from that region, lol. Maybe next time.
Posted by
Tetrodotoxin
on January 17, 2009
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Florida - "Mega-snakes"
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The escaped boas and pythons in Florida that grow large would be interesting.
Posted by
Zeah
on November 9, 2008
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Banded Rocks!!
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I guess the thought of actually working to find a rattlesnake scares most of you! The challenge of hiking mountains in pursuit of the most beautiful of rattlesnakes is worth the effort.
Posted by
Mofugly
on September 25, 2008
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timber rattler
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Ohio timber rattlesnake,cool to see!!
Posted by
newguy
on September 19, 2008
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South Carolina
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South Carolina-Jasper County Canebrake and Eastern Diamondback rattlesnakes the best a man can get
Posted by
H20mocasin
on September 8, 2008
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EDB
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BTDT on the others.
I want to see a huge EDB!
Posted by
svsnakes
on September 5, 2008
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leps
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Going after leps in a rare local tomorow upton county should also find some good pictigaster
Posted by
pictigaster1
on September 4, 2008
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Mottled Rock Rattlesnakes !
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Lepidus in extreme West Texas !
Snake hunting does not get better than that !
Best Regards John Z
Posted by
Cro
on September 2, 2008
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my real dream is easterns
Posted by
pictigaster1
on August 30, 2008
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leps
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I am in shock no votes for lepidus
Posted by
pictigaster1
on August 30, 2008
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Herping trip in USA
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Although it wouldn't be a long trip, I still had to pick the EDB, These are held in a special place in my heart, and I am working to try to educate the public on helping to preserve these magnificent animals. To me, it don't get any better than the E.D.B., the worlds largest rattlesnake.
Posted by
pdk9Roper
on August 28, 2008
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I chose the EDB, but have very happy memories of the NM lepidus!
Posted by
Pug
on August 26, 2008
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U.S. herping trip
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I chose NM, but anywhere out west would be good for me.I herp all over GA and FL and SC all the time, I haven't been out west yet. Maybe someday.
Posted by
agkistrodude
on August 25, 2008
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