Today I found out that there is a protozoa that has seven sexes. This organism is known as Tetrahymena thermophila.  They are species of ciliate protozoa, common in fresh-water. They are also known for being widely used in genetic and cytological research as model organisms. The seven sexes of Tetrahymena thermophila are somewhat uninventively named I, II, III, IV, V, … Continue reading There is a Protozoa that has Seven Sexes