The file photo of the Harper Mite is actually a false color Scanning EM photo of either Aceria anthrocoptes, the Canadian Thistle Mite, or one of the dust mites. The same photo shows up on the internet for several mite species.
The photo purportedly of 'Trichus barbarellus' is actually of a male parasite, Schistosoma ( probably mansoni), showing the oral sucker, ventral sucker, and the anterior end of the female protruding from the gynecophoral canal. Schistosomiasis afflicts hundreds of thousands of humans.