Excessive dryness can kill tarantulas, especially when they molt. Some species need moisture all the time. For any tarantula, a water dish is a good safeguard. There are at least 800 species of tarantulas. Pet shops may use common names unique to the pet shop.
Scientific names are important for finding out what kind of care the spider needs.
Ask the animal buyer to try to find out for you, or if not, at least what part of the world it came from. Mature males don't live very long, from a couple of months to two or three years depending on the species. Most males live between six and 18 months. Adult females may live for decades depending on the species. Many plastic and glass containers can be adapted for tarantula homes.