Type I - Lower half of caudal fin completely grey: without any white coloration pattern
Type II - Lower half of caudal fin containing a small "island" of white coloration
Type III - Leading edge of the lower caudal fin mostly covered with a white coloration pattern; without other areas of white patterns
Type IV - Combination of Type II and III, "island" of white coloration, and the leading lower caudal edge covered with a white pattern