It has be brought to my attention that I was mistaken on my info about the spots on their faces..lucipinnis spots are larger on their snouts than petricola spots which are smaller on their snouts....but taking this into consideration, there can be a difference of this within a group of the same kind.... this is what confused me..I thought I had both kinds. The most important way to be sure is look for the axillary pore which is a bony extension of the pectoral girdle, this is only found on the petricolas....also lucipinnis are smaller in size about 3 1/4 inches at adult size, where petricola are 4 1/2 at adult size, not taking in consideration there are dwarf petricolas.....I hope this clears matters up...I apologize for the bad info.