INS BIOLOGY OF THE PROTOZOA 



( !lass I. Ciliata Perty; em. Butschli. 



Sub-class II. Spirotricha Butschli 1889; em. Kalil 

 Order 4. Hypotrichida Stein 



Family 1. Oxytrichidae Ehr. 



Family 2. Ewphtidae Ehr. 



Family 3. Aspidiscidae Stein 

 Sub-class III. Peritricha Stein 



Family 1. Urceolariidae Stein 



Family 2. Vorticellidae Ehr. 

 Sul i-class IV. Chonotricha Wallengren 



Family 1. Spirochonidae Grobben 



Family 2. Chilodochonidae Poche 

 Class II. Suctoria. 



Family 1. Acinetidae Butschli 



Family 2. Discophryidae Collin 



Family 3. Dendrosomidae Butschli 



Family 4. Dendrocometidae Stein 



Family 5. Ophryodendridae Stein 



Family 6. Podophryidae Butschli 



Family 7. Ephelotidae Sand 



INFUSORIA. 



With simple cilia or combinations of cilia 

 throughout life Class Ciliata 



Ciliated only in developmental stages ; derived 

 organization with tentacles bearing cup- 

 like sucking discs Class Suctoria 



Class I. CILIATA Perty 1852; Butschli 1889. 



Key to Sub-classes 



1 . Body without adoral zone of membranelles 



Sub-class 1. Holotricha 

 Body with left < ir right-wound adoral zone . 2 



2. Adoral zone right-wound (towards the 



mouth) 3 



Adoral zone left-wound (towards the 



mouth) Sub-class 3. Peritricha 



3. Peristome not drawn out funnel-like 



Sub-class 2. Spirotricha 

 Peristome drawn out like funnel 



Sub-class 4. Chonotricha 



Sub-class I. HOLOTRICHA Stein 1859. 



Key to Orders 



1. Mouthless parasitic forms Order 1. Astomida 



Mouth-bearing forms; free-living or para- 

 sitic 2 



2. Gullet opens on surface, or in a vestibule 



without specialized cilia Order 2. Gymnostomida 



Gullet opens in vestibule with special cilia 

 or membranes 3 



3. Vestibule with rows of free cilia. . .Order 3. Trichostomida 

 Vestibule with membranes; with or with- 

 out additional cilia Order 4. Hymenostomida 



