mouth

Description:

Detail of oral aperture of the hymenostome ciliate, Frontonia acuminata. The oral aperture is roughly triangular with the base posterior and the anterior apex terminating at a thin preoral suture. There is an undulating membrane on the right and three adoral membranelles on the left. There is a narrow postoral suture to the right of which lie prominent vestibular ciliary rows and to the left of which lie postoral kineties. Collected from a slow-moving freshwater stream near Boise, Idaho in July 2003. DIC optics.