This will make total magnification of 100x and 400x. 10x objective lens is used to search for nematodes and nematode eggs. 40x objective lens is used to observe protozoa. There are many kinds of parasites. First they are devided into groups of external parasites and internal parasites.
External parasites includes mites and tics.
Internal parasites are devided into further groups. Some lives in digestive tract, some lives in organs, and some lives in cells. Here we will discuss about the parasites which only lives in digestive tract. For further study, I recommend you to read books about reptile parasites. Internal Parasite Parasites which are tend to live in iguanas usually not so much pathogenic.