The most significant characteristic for determining the sex of a tarantula is that female tarantulas are usually larger than males. Other than this trait, it is very difficult to determine the sex of the spider.Continue Reading
Female tarantulas tend to have longer life spans. Their bodies are heftier and bigger than the males. Other characteristics are harder to see, especially before a male matures. After the final molting stage, males have hooks on the long section of their bodies that they use for mating. They also have emboli, which are bulbs on the end of their pedipalps.
In some species of tarantulas, it is easier to determine the sex after they mature. The males will have much thinner legs and very distinct markings.Learn more about Spiders