members of the genera Paravauchomia, Poljans- 

 kina, Tripartiella, and Vauchomia occur in the 

 urinary bladder of fish; and members of the 

 genus Trichodina are found in association with 

 a wide variety of hosts. See review by Raabe 

 (1963a). 



Family VAGINICOLIDAE de Fromentel, 

 1874. Ten genera, of which six have marine rep- 

 resentatives. Members of the genera Cmdicola 

 and Thuricola are free-living. Cothurnia, 

 Platycola,, Pyxicola, and Vaginicola occur at- 

 tached to red or green algae, as well as the 

 outer surfaces of various invertebrates, includ- 

 ing crustaceans, polychaetes, hydroids, and 

 snails. See Kahl (1935). 



Family VORTICELLIDAE Ehrenberg, 1838. 

 Eight genera; three with marine representa- 

 tives. Members of the genera Carchesium and 

 Vorticella are free-living. Members of the genus 

 Zoothamnium are free-living and ectocommensal 

 on crustaceans and hydroids. See Kahl (1935). 

 Myonemes in colonial forms usually continuous, 

 except in the genus Carchesium. 



Family METOPIDAE Kahl, 1932. Six gen- 

 era; one, Metopus, with marine species. Free- 

 living in areas of low oxygen concentration. 

 See Jankowski (1964b). 



Family PERITROMIDAE Stein, 1867. Two 

 genera; one, Peritromus, with marine species. 

 Free-living. See Borror (1963) and Tuffrau 

 (1967b). 



Family SPIROSTOMATIDAE Stein, 1867. 

 At least eight genera, of which four have ma- 

 rine representatives: Blepharisma, Griiberia, 

 Parablepharisma, and Anigsteinia. Large, 

 elongate, free-living animals. See Isquith 

 (1968). The genus Protocruzia, usually placed 

 in this family, is sufficiently aberrant to warrant 

 transfer to a different family. They are free- 

 living, benthic, small, and fragile. See Ammer- 

 mann (1968). 



Family STENTORIDAE Carus, 1863. Four 

 genera; three with marine species: Climacos- 

 tormim. Fabrea, and Stentor. They occur pri- 

 marily in areas of low salinity. See Kahl (1932). 



Order Heterotrichida 



Family CAENOMORPHIDAE Poche, 1913. 

 Three genera; one, Caenomorpha, with marine 

 representatives. Occur in regions of low oxygen 

 concentration. Free-living. See Jankowski 

 (1964b). 



Family CHATTONIDIIDAE Villeneuve- 

 Brachon, 1940. One genus, Chattonidmm, free- 

 living. See Villeneuve-Brachon (1940). 



Family CONDYLOSTOMATIDAE Kahl in 

 Doflein and Reichenow, 1929. One genus, Con- 

 dylostoma, widespread and free-living. See 

 Borror (1963). 



Family FOLLICULINIDAE Dons, 1914. 

 Members of this family are grouped into at least 

 30 genera (listed by Corliss, 1961), all marine. 

 They are ectocommensal on various inverte- 

 brates. 



Family LICNOPHORIDAE Biitschli, 1887. 

 One genus, Licnophora, ectocommensal on snails, 

 mussels, sea cucumbers, marine worms, and 

 other invertebrates. See Villeneuve-Brachon 

 (1940). 



Order Odontostomatida 



Family EPALXELLIDAE Corliss, 1960. 

 Three genera; one, Epalxella, with marine spe- 

 cies. Free-living, in areas of low oxygen con- 

 centration. See Jankowski (1964b). 



Family MYLESTOMATIDAE Kahl, 1932. 

 Two genera; one, Mylestoma, with marine spe- 

 cies. Free-living, in areas of low oxygen con- 

 centration. See Jankowski (1964b). 



Order Oligotrichida 



Family HALTERIIDAE Claparede and Lach- 

 mann, 1858. Seven genera; four with marine 

 representatives: Cephalotrichidium, Me.ta- 

 strombidium, Strombidium, and Tontonia. 

 These are typically pelagic. Members of the 

 genus Strombidium are widespread, ubiquitous, 

 and in some cases benthic. See Kahl (1932). 

 Recently members of this family with a girdle 

 of trichites and polygonal cortical platelets, in- 

 cluding Strombidium and Tontonia, were placed 

 in the family STROMBIDIIDAE. See Faure- 

 Fremiet (1969). 



49 



