1. As stated, T. Blondi is currently the largest recorded T. So let's go with that.
2. Smallest.... I don't really deal much with the smaller Sp. So I've no clue, sorry.
3. The fastest is going to be some sort of arboreal. Pokies, Psalmopoeus, and Heteroscodra are all right up there with absolutely "My brain can't register that" speed. Bear in mind that all Ts are sprinters. Tons of speed for a limited duration.
4. The slowest one is any T that is comfortable and not eating. A happy T is one that doesn't move more than it needs to. The C. Crawshayi does come to mind as far as actual speed of movement. These guys are absolute TANKS with a bad attitude, but they're fairly slow compared to many other Ts.
5. Pokies, OBTs, and H. Macs all have particularly nasty bites. It's hard to say for sure, as that each person reacts differently to invenomation. Further to that, Ts don't give you the same "dose" each time. But again, the three above are traditionally pretty nasty.
6. For aggression/defensiveness the P. Murinus or OBT is probably the favorite. They CAN be handled (but so can anything) and you'll see videos of such handling, but by and large they seem to hate you for even thinking about looking at them. I like to think that they've got a bit of a Napoleon complex as that they aren't a very large T.
7. Most expensive right now is probably M. Balfouri. Others up there are P. Metallica and E. Olivicea.
8. For lifespan, it is dictated primarily by the temperature the T is kept and the frequency at which they are fed. That being said, there are still some Sp. that live way longer than others. Also though, I believe it was Stan Schultz that said this, but this hobby hasn't really been around long enough in a large enough scale to get an accurate idea as to what the MAXIMUM lifespan is for a given species. All of that being said though, I've heard of some fairly ancient G. Roseas.
Hope some of this helps with what you're looking for.
AKAIK from my time on these forums...
1. The biggest tarantula? (teraphosa apophisis or teraphosa blondi or ?)
I think apophysis is leggier, blondi is fatter and heavier
2. The smallest tarantula?
Someone already did this one, I have no clue
3. The fastest one
My personal fastest is my N chromatus. However, I dont have a large selection, and many others have much milder specimens. Haplopelmas are known to be fast, especially the common H lividum. There is a vid on Youtube of someone's H maculata escaping its tank and running all over the place. Of course, it depends a lot on the individual T. Also, a lot of T's dont 'run' as much as they 'sprint'. Even pokies, which are known for their mastery of teleportation, usually stop after a few feet (at least, thats what i have heard). Evolution-wise, running non-stop is bound to attract attention, and eventually someone that CAN eat you will be among them. Plus, what good are camouflaging colors if you are giving away your position a lot? But, I digress...
4. The slowest one
Grammostolas are known as being slow-moving, often pet rocks. Some Brachy's are like this too, but its much more species and individual-T oriented here; my B boehmi is not one to be taken lightly, and my B albo scurries into its burrow the moment I touch its tank.
5. The most venomous tarantula
Dont know too much about this one... Never been bitten. Mostly, the Old World species are worse, since their bite is their only protection (no hairs). I heard JnS talk about spending several hours in the hospital after a bite from a C crawshayi. Baboons and Pokies are known for nasty bites. Also, almost everything in Australia is very nasty, venom wise (AKAIK). I heard on the Discovery channel that this comes from the nature of the continent; often tough living conditions combined with sever completion for resources and lack of migration-area lead to everything needing to develop the strongest venom possible to kill its enemies. Kinda like the Nuclear-Arms race and the Cold War.
6. The most agressive
Most defensive is the politically correct term, for reasons already explained. My N chromatus is quite skittish, as well as my B boehmi. The latter has kicked hair at me on more than one occasion.
7. The most expensive
Already covered. P metallica, M balfouri, and E ovilacea (spelled right?) are among the most sought after. There are also some extremely rare ones, like certain Brachy's and others, that can fetch even higher prices at times. In the end, it mostly comes down to the dealer and the availability of the species; fewer specimens in the hobby lets the dealer ask a much higher price. Also, aspects of the species, such as growth speed, can have an effect, such as in the case of L parahybana. It puts out so many babies at once that dealers often give them away for free or for very little $. Others, like B smithi, may be common, but because they grow slowly and are protected cost much more, even as slings.
8. The most long-living
I cant say from experience (very few people can; the hobby is relatively new and many Ts can live for quite some time), but generally the slower growing the species, the longer it will live. Someone on here said he worked at a zoo that kept a 32 year old B smithi. Other genuses can include Aphonopelma and Grammostola. G pulchra is known for being very slow growing, along with A chalcodes and many other Brachy's. Across the species barrier, Mature Males almost always die much faster than females.
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