Chapter 33 

 Order 1 Holotricha Stein (continued) 



Suborder 3 Trichostomata Biitschli 



With gelatinous lorica; swimming backward 



Family 1 Marynidae (p. 532) 



Without lorica 



Compressed; armor-like pellicle; ciliation sparse, mainly on flat 

 right side in 2-9 broken rows on semicircular or crescentic keel ; 

 cytostome on flattened ventral surface, with an obscure 



membrane Family 2 Trichopelmidae (p. 532) 



Body form and ciliation otherwise 



With a long caudal cilium; cilia in 3-4 spiral rows on anterior half, 



very small forms Family 3 Trimyemidae (p. 534) 



Without a caudal cilium; form and ciliation otherwise 



With a spiral zone of special cilia, from cytostome to posterior 

 end 

 Spiral zone extends from anterior right to posterior left. . . . 



Family 4 Spirozonidae (p. 534) 



Spiral zone extends from anterior left to posterior right. . . . 



Family 5 Trichospiridae (p. 534) 



Without spiral zone of special cilia 



Ciliated cross-furrow in anterior 1/5 on ventral surface, leads 



to cytostome Family 6 Plagiopylidae (p. 534) 



Without ciliated cross-furrow 



Cytostome in flat oval groove with heavily ciliated ridge in 



anterior 1/4 Family 7 Clathrostomidae (p. 536) 



Cytostome funnel-like, deeply situated 



Cytostomal funnel with strong cilia; peristome from 



anterior left to middle right 



Family 8 Parameciidae (p. 537) 



Without such a peristome 



Free-living; oral funnel deep; cilia at bottom and top 



Family 9 Colpodidae (p. 540) 



Endozoic 



Commensal in vertebrates 



Family 10 Entorhipidiidae (p. 541) 



Parasitic in vertebrates 

 Ciliation uniform 



With concrement vacuoles 



Family 11 Paraisotrichidae (p. 543) 



Without the vacuoles 



Family 12 Isotrichidae (p. 544) 



531 



