How many species of animals have TTX?

Answer 1

Here's a wiki snippet. It doesn't give a number but it does give you an idea and maybe a starting point for further research.

http://en.wikipedia.org/wiki/Tetrodotoxin#Tetrodotoxin_sources_in_nature

Answer 2

Tetrodotoxin (anhydrotetrodotoxin 4-epitetrodotoxin, tetrodonic acid, TTX) is a potent neurotoxin with no known antidote, which blocks action potentials in nerves by binding to the pores of the voltage-gated, fast sodium channels in nerve cell membranes. The binding site of this toxin is located at the pore opening of the voltage-gated Na+ channel. Its name derives from Tetraodontiformes, the name of the order that includes the pufferfish, porcupinefish, ocean sunfish or mola, and triggerfish, several species of which carry the toxin. Although tetrodotoxin was discovered in these fish and found in several other animals, it is actually the product of certain bacteria such as Pseudoalteromonas tetraodonis, certain species of Pseudomonas and Vibrio, as well as some others.

Answer 3

I am guessing you mean tetrodotoxin. According to what I've read a wide variety of species produce this poison.