The zoospore stage of rumen fungi was once thought to be a flagellated protozoan, and was named Neocallimastix frontalis. The population density of these flagellates would rapidly increase just after feeding. About 10 hours after feeding the numbers would reach a low point. In the mid 1970's it was determined that the flagellated organism was actually a zoospore of fungi which explained how the organism could duplicate so quickly and then later, disappear almost completely. A dozen or more genera and species of fungi that live exclusively in the rumen have since been described.
This animation is also included in the Rumen Microbes animations, but because its life cycle is interesting, it is also shown seperately.
Additional animations explaining digestion in the goat.