The embryos are ciliated, unlike those of many of the ectoparasite worms.
The only kind of ectoparasite found on captive cottonmouths in the course of my study was a snake mite, Ophionyssus natricus.
ectoparasite ec·to·par·a·site (ěk'tə-pār'ə-sīt')
A parasite that lives on the surface or exterior of the host organism, such as an ectophyte or an ectozoon.
See under parasite.