Family TRACHELOCERCIDAE Kent, 1880. 

 Six genera: Gruvelina, Nephrocerca, Protrich- 

 ophora, Trachelocerca, Tracheldnema, and Tro- 

 cheloraphis; all free-living, marine, and char- 

 acteristic of sandy substrata. See Dragesco 

 (1960). 



Order Trichostomatida 



Family BALANTIDIIDAE Reichenow, 1929. 

 One genus, Balantidium; free-living and in the 

 gut of polychaetes and amphipods and the gas- 

 trovascular cavity of medusae. See Kahl (1934a) 

 and Faure-Fremiet (1955). 



Family CLATHROSTOMATIDAE Kahl. 

 1926. This family (also known as PARANAS- 

 SULIDAE Faure-Fremiet, 1961) is placed here 

 rather than in the Gymnostomatida as the ves- 

 tibular ciliature used in feeding is distinct from 

 the somatic cilia. As some of these ciliates may 

 possess structures interpretable as peniculi, their 

 inclusion in the Trichostomatida is artificial. 

 One genus with marine species, Paranassula. 

 Free-living. See Faure-Fremiet (1962a). GulU 

 marella faurei Fenchel, 1964, endocommensal 

 in bivalves, is of uncertain position in this order 

 since little is understood of its morphogenesis, 

 but may also belong in this family. See Fenchel 

 (1964). 



Family COELOSOMIDIDAE Corliss, 1961. 

 Three genera with marine representatives: 

 Coelosomides, Paraspathidium, and Pseudopro- 

 rodon; free-living. Conchostoma longissimum 

 Faure-Fremiet, 1963, is a species of uncertain 

 taxonomic position in this order, but may belong 

 in this family. 



Family COLPODIDAE Ehrenberg, 1838. 

 Contains Woodruff ia (in estuaries) and Colpoda 

 (typically a soil ciliate, but sometimes found in 

 tidal marshes). Free-living. See Kahl (1931) 

 and Prelle (1963). 



Family GELEIIDAE Kahl, 1933. Two gen- 

 era: Corlissia and Geleia; free-living in ma- 

 rine sands and algal mats. The genus Corlissia 

 is of questionable systematic position, since little 

 is understood of the cilia in the region of the 

 cytostome. See Dragesco (1960). 



Family PLAGIOPYLIDAE SchewiakoflF, 1896. 

 At least four genera with marine species: Lech- 



riopyla, Plagiopyla, Plagiopyliella, and Sonderia. 

 Free-living or endocommensal in sea urchins. 

 See Kahl (1933). Schizocaryum dogieli Pol- 

 jansky and Golikova, 1957, endocommensal in 

 sea urchins, may also be a member of the family 

 PLAGIOPYLIDAE. See Berger (1961d). 



Family TRIMYEMIDAE Kahl, 1933. One 

 genus, Trimyema. Free-living. See review by 

 Faure-Fremiet (1962b). 



Pericaryon cesticola Chatton, 1911 was de- 

 scribed as endocommensal in the ctenophore, 

 Venus' girdle, Cesttis veneris. This species has 

 been regarded as being in the family FOET- 

 TINGERIIDAE (order Apostomatida), but 

 possesses a vestibulum and lacks a cytostomal 

 rosette. See Chatton and Lwoflf (1935). 



Order Chonotrichida 



Family CHILODOCHONIDAE Wallengren, 

 1895. One genus, Chilodochona; ectocommensal 

 on the exoskeleton of Ebalia and Portunus. See 

 Faure-Fremiet, Rouiller, and Gauchery (1956). 



Family SPIROCHONIDAE Stein, 1854. One 

 genus, Spirochona; ectocommensal on pleopodal 

 bristles of gammaridean amphipods. See Ma- 

 tsudo and Mohr (1968). 



Family STYLOCHONIDAE Mohr, 1948. Five 

 genera with marine species: Heliochona, Ken- 

 trochona, Lobochona, Oenophorachona, and Sty- 

 lochona; ectocommensal on crustaceans (includ- 

 ing Nebalia and Limnoria). See Matsudo and 

 Mohr (1965) and Mohr, Levague, and Matsudo 

 (1963). 



Order Suctorida 



Family ACINETIDAE Stein, 1859. At least 

 eight genera with marine species: Acineta, 

 Acinetopsis, Dactylophrya, Endosi)haera, Pot- 

 tsiocles, Pseitdo gemma, Tachyblaston, and The- 

 cacineta. Free-living and ectocommensal. Mi- 

 gratory stages formed by internal (endogenous) 

 budding. See Kahl (1934b). 



Family DENDROSOMATIDAE Fraipont, 

 1878. A large family of at least 13 genera, of 

 which only Lemaeophrya and Trichophrya have 

 marine representatives. Budding endogenous. 



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