ABSTRACT
Merogony absent; gamogony and sporogony present; typically parasites of annelids and arthropods but some species in other nonvertebrates; locomotion progressive, by gliding or undulation of longitudinal ridges, or nonprogressive.
Merogony absent; gamogony and sporogony present; typically parasites of annelids and arthropods but some species in other nonvertebrates; locomotion progressive, by gliding or undulation of longitudinal ridges, or nonprogressive.