Answer:
There are 7 types of guinea pigs that are recognised world wide!
The main types of guinea pigs, (the ones your mot likely to find at your pet store) Are the breeds, American and the abyssinian.
The other 5 breeds are, the teddy, peruvian, silkie, texel and coronet.
There are also other breeds that arn't classified as pure bred breeds and a classic example of this is the hair-less guinea pig.