CRITERIA NORMAL MORPHOLOGY [1] HEAD FORM [OVAL/NORMALIZED OUTLINE/ACROSOME [SIGNIFICANT PROPORSION SURFACE HEAD/RATE 40-70%]/ VACUOLES [RATE SURFACE HEAD 20%]]

[2] NECK/INTERMEDIATE SECTION [REGULAR SHAPE/STRAIGHT BLOWN TAIL]

[3] TAIL [NON SPIRAL/STRAIGHT OR SLIGHTLY BENT/OUTLINE KINGDOM]

[4] CYTOPLASMATIC DROP OF [NORMA;IZED OUTLINE/ HEAD OF OR INTERMEDIATE SECTION]