Animals are generally considered to have evolved from a flagellated eukaryote. Their closest known living relatives are the choanoflagellates, collared flagellates that have a morphology similar to the choanocytes of certain sponges. Molecular studies place animals in a supergroup called the opisthokonts, which also include the choanoflagellates, fungi and a few small parasitic protists. The name comes from <answer>the posterior location of the flagellum in motile cells</answer>, such as most animal spermatozoa, whereas other eukaryotes tend to have anterior flagella.
Where does the name opisthokonts come from?
the posterior location of the flagellum in motile cells