Redescription of Bdella muscorum Ewing, 1909 (Bdellidae: Bdellinae) from China with Its First Description of Ontogeny.

Bdella muscorum Ewing, 1909 was redescribed and illustrated in detail, and its ontogeny was described and illustrated for the first time, including pro dorsal apodeme and chaetotaxy. Chaetotaxy changes in Bdella are mainly focused on ventral hypostomal setae ( vh ), setae on palpal basifemur, aggenital setae ( ag ), genital setae ( g ), anal setae ( ad ) and leg setae. Furthermore, an original key to the Bdella species from China was also provided.