135 μm^2 surface area: 31.3 μm^3 volume
||Sheep Ovis aries
||Curry MR, Millar JD, Tamuli SM, Watson PF. Surface area and volume measurements for ram and human spermatozoa. Biol Reprod. 1996 Dec55(6):1325-32. p.1327 left column 3rd paragraph and right column bottom paragraphPubMed ID8949890
||Spermatozoon surface area was measured by micrometric methods and was also measured from electron micrographs using a stereological method. Micrometric methods gave surface area above. Stereology methods gave surface area of 142µm^2. Sperm volumes were estimated by stereology and by radiolabel volume exclusion methods. Stereology measurement gave volume above.
||From the volume exclusion method, ram sperm volume was estimated as 25µm^3.