We believe these to be the juvenile nematomorphs. They vary in size and color. The black appear to be the longest and most abundant. Nematomorphs reproduce in many ways, one being that the male and female intertwine, pressing their genital pores together. The clear or colorless threadlike are juvenile, changing color as they mature and become sexually active.
Nematomorphs are common in Africa, yet were never really considered to exist in other parts of the world. It has become a pretty small world over the past two centuries. Parasites adapt to their hosts, such as the living conditions inside an insect's body or that of a human. The claim that there are bugs inside our bodies is horrifyingly true.