Agressive Tarantula's

[Paramite]

Thanks for the advice. BTW, how bad is the bite from a H. Lividum? I've heard it's one of worst, as far as tarantulas go anyway.

There isn't good studies, so we can only guess. But based on the bite reports, Haplopelma bites seem to come closer to Poecilotheria or Stromatopelma than C. crawshayi.

 

[Zoltan]

There was a study published recently about the venom of Haplopelma lividum:

Moore, S., Smyth, W. F., Gault V. A., O'Kane, E. & McClean S. 2009. Mass spectrometric characterisation and quantitation of selected low molecular mass compounds from the venom of Haplopelma lividum (Theraphosidae) Rapid Communications in Mass Spectrometry 23(12), pp. 1747-1755

Abstract:
Arachnid venoms present a diverse and complex matrix for investigation, with their latent potential for innovative drug and pesticide design largely enrealised. The characterisation and quantification of selected low molecular mass compounds isolated from the crude venom of the Cobalt blue tarantula (Haplopelma lividum) were the objectives of this study. Fractionation of the crude venom was performed using reversed-phase high-performance liquid chromatography, with compound identification using both electrospray ionisation ion trap mass spectrometry and quadrupole time-of-flight mass spectrometry. Four compounds were identified, and quantification on a percentage dry weight basis was achieved by liquid chromatography/electrospray ionisation tandem mass spectrometry based on the formation of their corresponding product ions. Of these the most abundant component was glutamic acid, present at a level of 0.97%. Histamine and adenosine were detected at 0.14% and 0.10% dry weight, respectively, with the polyamine spermine noted in trace amounts at 0.002%. The limits of detection and quantification were established for each of the identified components. The fragmentation profile for histamine has also been proposed.

I became aware of this via the BTS forum, where Nicola Dolby posted in the thread:

I'm pretty new to all of this so if I get it wrong I apologise but:

Adenosine causes hyperemia, which is increased blood flow due to increased cellular activity. 12 microgrammes is enough for maximal hyperemia in humans, though how much would cause arrhythmia I don't know.
Histamine causes pain and possible tissue irritation.
Glutamic acid, in small doses a staple part of the human diet, has been known to lower blood pressure.
Spermine helps cellular growth, and promotes bacterial growth
So to us this venom would hurt like hell and (might) cause hot flushes, but to a mouse its like washing down a box of sleeping pills and a box of blood thinners with seratonin whilst being hooked up to the mains - I think:-S

Originally posted here.

 

[xhexdx]

I've had first-hand experience with H. lividum venom, and I can tell you, it's not fun.

However, I haven't been tagged by anything else as of yet, so I couldn't give a comparison.

 

[Paramite]

There was a study published recently about the venom of Haplopelma lividum:

Moore, S., Smyth, W. F., Gault V. A., O'Kane, E. & McClean S. 2009. Mass spectrometric characterisation and quantitation of selected low molecular mass compounds from the venom of Haplopelma lividum (Theraphosidae) Rapid Communications in Mass Spectrometry 23(12), pp. 1747-1755

Abstract:
Arachnid venoms present a diverse and complex matrix for investigation, with their latent potential for innovative drug and pesticide design largely enrealised. The characterisation and quantification of selected low molecular mass compounds isolated from the crude venom of the Cobalt blue tarantula (Haplopelma lividum) were the objectives of this study. Fractionation of the crude venom was performed using reversed-phase high-performance liquid chromatography, with compound identification using both electrospray ionisation ion trap mass spectrometry and quadrupole time-of-flight mass spectrometry. Four compounds were identified, and quantification on a percentage dry weight basis was achieved by liquid chromatography/electrospray ionisation tandem mass spectrometry based on the formation of their corresponding product ions. Of these the most abundant component was glutamic acid, present at a level of 0.97%. Histamine and adenosine were detected at 0.14% and 0.10% dry weight, respectively, with the polyamine spermine noted in trace amounts at 0.002%. The limits of detection and quantification were established for each of the identified components. The fragmentation profile for histamine has also been proposed.

I became aware of this via the BTS forum, where Nicola Dolby posted in the thread:

Originally posted here.

Thanks, that's interesting. I haven't seen one of these since the one about P. cambridgei.

 

[smallara98]

I have owned species thats said to be "MEANEST" and they were as nice as a doll But I have a "Beginner" t , the Seemani Brown Form , and it is the meanest thing iv'e owned !

 

[FireGuyX]

The P. Cancerides was my first tarantula, and I actually bought it because I wanted a large, aggressive species. Cost was also a factor as I wanted something inexpensive. She/he has certainly lived up to the reputation.

BTW I know the reputation of many of the OW species and my next purchase will probably be a Cobalt Blue or King Baboon. The H. Lividum was another one of the species I was considering starting out with but I went with the Cancerides because of the size.

My P.cancerides is extremely docile, it doesn't even flick hairs. Then again it's a male, I don't if the female is different, but I've also seen docile female P.cancerides.

 

[AmbushArachnids]

From my experience I would say

Usambara
Cobalt Blue
Vietnamese/ Thailand Tiger
Skeleton

My Ts nodded there head at this.

 

[brian abrams]

Meanest T's

Personally NOT a fan of these... but just to comment on the thread-the meanest T I own is also a lighter-colored Seemani (if indeed it IS a Seemani, I'm going by the orange spinnerettes. However, my opinion, not based on personal experience, but from reading similar threads; I'd say

1) Selenocosmia Sp. Ex-Dichromata
2) Stromatopelma Calceatum
3) Dunno, I'll just guess- Rangoon Mustard Spider...Where do they rank??