Scientific name: 
Holacanthus ciliaris
Distinctive features: 
1. Dark blue spot on forehead, speckled and ringed with brilliant blue, forms the "crown." 2. Tail yellow.
Size: 
8-14 in. max. 18 in
Blue to greenish blue, with yellow rims on scales; yellow ventral and pectoral fins; deep blue lips and markings on gill cover; yellowish face.