The platine bones are covered with a totally of 14 small teeth . A high-backet , compressed species . The back and head are dark gray to olive-green in color , while the upper half of the body looks dirty white to silvery and shows a few dark spots . Often there is a dark spot on the shoulder . The fins of immature animals are light , transparent .
Old animals become totally black .
This maybe a subspecies or synonym of S.Rhombeus . 29-36 teeth on the ventral keel . A high-backed and very strongly compressed species . Immatures are silvery with numerous black speckles . With increasing age changes into a dirty indistincly spotted gray fish .