right dorsolateral view,excretory pores of contractile vacuole
Right dorsolateral surface view of the hymenostome ciliate, Frontonia angusta (Kahl, 1931). Very similar in overall apppearance to F. acuminata (Ehrenberg,1833)Buetschli,1889. F. angusta lacks the anterior apical collection of pigmented granules seen in F. acuminata and its contractile vacuole has 3-4 excretory pores (4 in this case).The approximately 6 Âµm long extrusomes are clearly visible. Ingested diatoms and green algae are present. Collected from a freshwater pond near Boise, Idaho.DIC.