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There are 2 species - the Western and Eastern gorillas, and both species have silverback males. The larger of the two is the Eastern Gorilla. The maximum size of a male gorilla can be over 225 kg (500 lb) and 1.83 m (6 ft) in the wild, with much heavier weights recorded in captivity. (Although I can't find a decent reference to the recorded sizes either.)
1 The longest lived gorilla in captivity was named Jenny, and she lived to be 55 years old.  Femelle is the Milwaukee County Zooâs oldest gorilla, estimated to be age 47 (as of October 2009). There are 25 gorillas older than Femelle in North American zoos (as of October 2009).