Chapter 41 

 Order 3 Chonotricha Wallengren 



THESE ciliates live attached to aquatic animals, especially 

 crustaceans and have developed a peculiar organization. The 

 body is, as a rule, vase-form with an apical peristome, around 

 which extends a more or less complicated ectoplasmic collar or 

 funnel and along which are found ciliary rows that lead to the 

 deeply located cytostome and cytopharynx. The macronucleus is 

 oval and situated centrally; there is a contractile vacuole usually 

 near the cytopharynx. Asexual reproduction is by lateral budding, 

 and conjugation has been observed in a few species. 



Family Spirochonidae Stein 



Genus Spirochona Stein. Peristome funnel spirally wound; 

 ciliary zone on floor of spiral furrow, attached to Gammarus in 

 fresh water. Several species. Swarczewsky (1928) described 

 several species from Lake Baikal in Siberia. 



S. gemmipara S. (Fig. 278, a). 80-120/x long; attached to gill- 

 plates of Gammarus pulex and other species. 



Genus Stylochona Kent. Peristomal funnel with an inner fun- 

 nel. One species. 



S. coronata K. (Fig. 278, h). About 60/^ long on marine Gam- 

 marus. 



Genus Kentrochona Rompel ( Kentrochonopsis Doflein). Peri- 

 stomal funnel wide, simple, membranous; with or without a few 

 (2) spines. 



K. nebaliae R. (Fig. 278, c). About 40ai long; much flattened, 

 with its broad side attached by means of gelatinous substance to 

 epi- and exo-podite of Nehalia geoffroyi; salt water. 



Genus Heliochona Plate. Peristomal funnel with numerous 

 needle-like spines. 



H. scheuteni (Stein) (Fig. 278, d). About 80-90;u long; on ap- 

 pendages of Gammarus locusta; salt water. 



H. sessilis P. (Fig. 278, e). About 60/i long; on Gammarus 

 locusta; salt water. 



Genus Chilodochona Wallengren. Peristome drawn out into 2 

 lips; with a long stalk. 



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