Chapter 42 

 Order 3 Chonotricha Wallengren 



THESE ciliates live attached to aquatic animals, especially crus- 

 taceans 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 cyto- 

 stome and cytopharynx. The macronucleus is oval and situated cen- 

 trally; there is a contractile vacuole usually near the cytopharynx. 

 Asexual reproduction is by lateral budding, and conjugation has been 

 observed in a few species. Taxonomy (Kahl, 1935); distribution 

 (Mohr, 1948). 



Family Spirochonidae Stein 



Genus Spirochona Stein. Peristome funnel spirally wound; ciliary 

 zone on floor of the spiral furrow; attached to Gammarus in fresh 

 water. Many species (Swarczewsky, 1928). 



S. gemmipara S. (Fig. 360, a). 80-120/* long; attached to the gill- 

 plates of Gammarus pulex and other species. Morphology (Guilcher, 

 1950). 



Genus Stylochona Kent. Peristomal funnel with an inner funnel. 

 One species. 



S. coronata K. (Fig. 360, b). About 60/* long; on marine Gammar- 

 us. 



Genus Kentrochona Rompel ( Kentrochonopsis Doflein). Peri- 

 stomal funnel wide, simple, membranous; with or without a few (2) 

 spines. 



K. nebaliae R. (Fig. 360, c). About 40// long; much flattened, with 

 its broad side attached by means of gelatinous substance to epi- 

 and exo-podite of Nebalia geoffroyi; salt water. 



Genus Trichochona Mohr. Elongate; with a long stalk; pellicle 

 thick; a single and simple funnel; two ciliary patches, one parallel to 

 funnel rim and the other diagonal in the deep part of funnel; one 

 macronucleus; one to four micronuclei; budding; marine. One species 

 (Mohr, 1948). 



T. lecythoides M. (Fig. 360, d, e). Body 35-86/x by 3-28 /*; funnel 

 8-21. 5/i high; stalk 16-51/z long; peristomal funnel with horizontal 

 ciliary lines, up to 32; diagonal lines about 20; on the appendages of 

 the marine crustacean, Amphithoe sp. 



Genus Heliochona Plate. Peristomal funnel with numerous needle- 

 like spines. Taxonomy (Wallengren, 1895; Guilcher, 1950). 



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