Scientific name: 
Stegastes partitus
Distinctive features: 
Black and white. 1. Forebody is usually black.
2 - 3 1/2 in. max. 4 in.

Location of boundary between dark and pale area varies greatly; dark area may cover only upper head or extend past midbody to base of tail; pale area often yellowish near boundary, especially toward belly. Pale fins may have bluish cast. On rare occasion, there is a reverse color phase.