Varicose veins are large, raised, swollen blood vessels that twist and turn. They usually develop in the legs and can be seen through the skin. Spider veins are smaller, red, purple, and blue vessels that also twist and turn. Spider veins are easily visible through the skin, as well.
Common name: Flatworms. 1  Scientific name: many species. Phylum: Platyhelminthes. 2  Description: Although they are called Flatworms, these invertebrates are not flat. They are round-bodied with a flat belly. 3  Fun facts: A Flatworm has a single opening to its stomach, in the middle of its underside.
Scientists refer to them by their scientific names. Since most people are not familiar with most species of flatworms, most flatworms do not have common names. Some scientific names: Blood flukes-Three human species-Schistosoma mansoni, Schistosoma haematobium, Schistosoma japonicum.cientists refer to them by their scientific names. Since most people are not familiar with most species of flatworms, most flatworms do not have common names. Some scientific names: Blood flukes-Three human species-Schistosoma mansoni, Schistosoma haematobium, Schistosoma japonicum.