Chapter 34 

 Order 1 Holotricha Stein (continued) 



Suborder 3 Trichostomata Biitschli 



With gelatinous lorica; swimming backward 



Family 1 Marynidae (p. 594) 



Without lorica 



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

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

 tostome on flattened ventral surface, with an obscure membrane . 



Family 2 Trichopelmidae (p. 595) 



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. 595) 



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. 596) 



Spiral zone extends from anterior left to posterior right 



Family 5 Trichospiridae (p. 596) 



Without a spiral zone of special cilia 



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



to cytostome Family 6 Plagiopylidae (p. 596) 



Without ciliated cross-furrow 



Cytostome in flat oval groove with heavily ciliated ridge in 



anterior 1/4 Family 7 Clathrostomidae (p. 598) 



Cytostome funnel-like, deeply situated 



Cytostomal funnel with strong cilia; peristome from an- 

 terior left to posterior right 



Family 8 Parameciidae (p. 598) 



Without such a peristome 



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



Family 9 Colpodidae (p. 601) 



Endozoic 



Commensal in vertebrates 



Family 10 Entorhipidiidae (p. 603) 



Parasitic in vertebrates 

 Ciliation uniform 



With concrement vacuoles 



Family 11 Paraisotrichidae (p. 605) 



Without such vacuoles 



Family 12 Isotrichidae (p. 605) 



Ciliation not uniform 



Cytostome occupies the entire anterior end; cilia 



only in anterior region 



Family 13 Cyathodiniidae (p. 606) 



Cytostome not terminal; tufts of cilia above and 

 below cytostome and in posterior region .... 

 Family 14 Blepharocoridae (p. 607) 



593 



