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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.)
GORILLA FACT SHEET STATUS: Endangered. DESCRIPTION: Of the three subspecies of gorilla, the mountain gorilla is the largest and rarest. Remarkably strong, the mountain gorilla has a short trunk and a broad chest and shoulders. Males develop a streak of silver hair on their backs when they mature and are called silverbacks.. SIZE: Male mountain gorillas reach an average of 6 feet tall (when standing upright) and weigh 400 to 500 pounds, making them the largest of the great apes (chimpanzees, orangutans, and gorillas).