Mansonella streptocerca, (formerly Diptalonema streptocerca), is the scientific name of a human parasitic roundworm causing the disease streptocerciasis. It is a common parasite in the skin of humans in the rain forests of Africa, where it is thought to be a parasite of chimpanzees, as well.Mansonella streptocerca is one of three filarial nematodes that cause subcutaneous filariasis in humans.