Mann T, Martin A W, Thiersch J B, Lutwak-Mann C, Brooks D E, Jones R
Science. 1974 Aug 2;185(4149):453-4. doi: 10.1126/science.185.4149.453.
The spermatozoa of Octopus dofleini martini produce anaerobically D(-)-lactic acid and possess a very active D(-)-lactate dehydrogenase. In this respect, while resembling certain microorganisms, they differ strikingly from mammalian spermatozoa which produce L(+)-lactic acid and contain L(+)-lactate dehydrogenase.