Texas, I love ya. Of the nearly one thousand different spider species found in the Lone Star State, only four types can inject enough venom into a human to cause harm, according to A-Z Animals. However, I should note, according to my experience, seeing any of the nearly one thousand species in my kitchen will be followed by my squealing like a little piglet. The Most Dangerous Spiders You'll Find in TexasIn all seriousness, most spiders are not harmful to humans. There are just a few venomous species of spiders here in Texas; worldwide, that number is much bigger, with over 43,000 different kinds.