Scientific name: 
Sparisoma viride
Distinctive features: 
1. Bright yellow spot at upper corner of gill cover. 2. Yellow area at base of tail. 3. Salmon to yellow crescent on tail.
Size: 
1 - 1 1/2 ft. max. 2 ft.
Emerald green. Salmon to yellow markings on head and fins. Tail is crescent-shaped.