-
top jaw - front with teethisthmus under throat - slender, slight shoulders at front base
-
top jaw - front without teethisthmus under throat - distinct blunt shoulders at front base
-
silver stripe narrows & fades at reartop jaw - front with teethisthmus under throat - triangular, no front shoulders
-
silver stripe NOT narrowing or fading at reartop jaw - front with teethisthmus under throat - triangular, no front shoulders