Colpidium Stein, 1860
Oligohymenophora; Tetrahymenina (ref. ID; 5940)

[ref. ID; 2014]
Outline-shape reniform, ventral side concave, dorsal surface convex. Oral aperture located about quarter of way down body in the concavity of the ventral surface. Oral aperture relatively small and oval in outline. The undulating membrane on the right of the aperture may be visible and there are 3 membranelles on the left which may only be seen if impregnated with the silver. Uniform somatic ciliation with the kineties bending appearance. Pre-oral suture is 6-shaped at the anterior pole. Sometimes a tuft of short caudal cilia present. Contractile vacuole in posterior body half. Macronucleus ovoid, centrally located with an adjacent micronucleus.
Quote; Colin R. Curds, Michael A. Gates and David McL. Roberts "British and other freshwater ciliated protozoa Part II Ciliophora: Oligohymenophora and Polyhymenophora" Cambridge University Press, 1983 (ref. ID; 2014)

Colpidium acuminatum (ref. ID; 4611)
Colpidium campylum (Stokes) (ref. ID; 1219, 1618, 3698, 5462), (Stokes, 1886) Bresslau, 1922 (ref. ID; 1622, 1882, 2245, 3116, 4611) reported author and year? (ref. ID; 65, 191, 3954, 5940), campyllum (Stokes) Bresslau (ref. ID; 3342)
See; Dexiostoma campylum Ganner & Foissner, 1989 (ref. ID; ?) or (Stokes, 1886) Jankowski, 1967 (ref. ID; 4611)
Syn; Cryptochilum griseolum var. marium Gourret & Roeser, 1866 (ref. ID; 1622); Glaucoma colpidium Schewiakoff, 1896 (ref. ID; 1622); Tillina campylum Stokes, 1886
Colpidium caudatum Wilbert, 1982 (ref. ID; 503 original paper)
Colpidium colpidium (Schewiakoff) (ref. ID; 5462)
Colpidium colpoda (ref. ID; 65, 191)
Colpidium colpoda (Ehrenberg, 1831) (ref. ID; 3593) reported year? (ref. ID; 1618, 3698, 5462), (Ehrenberg, 1831) Stein, 1869 (ref. ID; 1219, 1335, 1622, 1629, 1896, 2245) or 1860 (ref. ID; 3116) reported year? (ref. ID; 646, 3342)
Syn; Colpidium cucullus Kent, 1882 (ref. ID; 3116); Paramecium colpoda Ehrenberg, 1831 (ref. ID; 3116); Tillina campylum Stokes, 1886 (ref. ID; 1622, 3116); Tillina helia Stokes, 1885 (ref. ID; 1622) reported year? (ref. ID; 1618)
Colpidium colpoda (Losana, 1829) Stein, 1860 (ref. ID; 4488, 4611)
Syn; Paramaecia kolpoda Losana, 1829 (ref. ID; 4611)
Colpidium cucullus Kent, 1882
See; Colpidium colpoda (ref. ID; 3116)
Colpidium echini (Russo) (ref. ID; 1618)
Colpidium kleini Foissner, 1969 (ref. ID; 4488, 4611) reported year? (ref. ID; 3698) reported author and year? (ref. ID; 191, 1629)
Colpidium pannonicum V. Gelei, 1932 (ref. ID; 1620)
Colpidium singulare (ref. ID; 4611)
Colpidium striatum Stokes, 1886 (ref. ID; 1622) reported year? (ref. ID; 1618, 5462) reported author and year? (ref. ID; 65)
Colpidium truncatum Stokes, 1885 (ref. ID; 1622, 4611) reported year? (ref. ID; 3698, 5462) reported author and year? (ref. ID; 191)
See; Paracolpidium truncarum (ref. ID; 4611)

Colpidium campylum (Stokes) (ref. ID; 1219, 1618, 3698, 5462), (Stokes, 1886) Bresslau, 1922 (ref. ID; 1622, 1882, 2245, 3116, 4611) reported author and year? (ref. ID; 65, 191, 3954, 5940), campyllum (Stokes) Bresslau (ref. ID; 3342)
See; Dexiostoma campylum Ganner & Foissner, 1989 (ref. ID; ?) or (Stokes, 1886) Jankowski, 1967 (ref. ID; 4611)
Syn; Cryptochilum griseolum var. marium Gourret & Roeser, 1866 (ref. ID; 1622); Glaucoma colpidium Schewiakoff, 1896 (ref. ID; 1622); Tillina campylum Stokes, 1886
Description; Elongated, reniform, sometimes ovoid; uniform ciliation except for a group of longer cilia at the posterior pole; preoral suture slightly displace towards the ventral side; suture curved to right; small triangular buccal cavity near the right side of the body at about 1/4 of the body length from the anterior pole; buccal ciliation tetrahymenal; 1 undulating membrane on the right and 3 adoral membranelles on the left; 1 spherical macronucleus and 1 micronucleus in the central part of the body; 1 contractile vacuole located near the right margin. (ref. ID; 1219)
Elongate reniform; 27-30 ciliary meridians; preoral suture curved to right; in fresh and brackish water. (ref. ID; 1618)
Measurements; Length 50-120 um. (ref. ID; 1219)
50-70 um long. (ref. ID; 1618)
45-60 x 20-25 um. (ref. ID; 3342)

Colpidium colpoda (Ehrenberg, 1831) (ref. ID; 3593) reported year? (ref. ID; 1618, 3698, 5462), (Ehrenberg, 1831) Stein, 1869 (ref. ID; 1219, 1335, 1622, 1629, 1896, 2245) or 1860 (ref. ID; 3116) reported year? (ref. ID; 646, 3342)
Syn; Colpidium cucullus Kent, 1882 (ref. ID; 3116); Paramecium colpoda Ehrenberg, 1831 (ref. ID; 3116); Tillina campylum Stokes, 1886 (ref. ID; 1622, 3116); Tillina helia Stokes, 1885 (ref. ID; 1622) reported year? (ref. ID; 1618)
Description; Ovoid or reniform, elongated; except for a few long caudal cilia, uniform ciliation about 55 ciliary meridians; preoral suture curved to the left and widely displaced to the ventral side; buccal cavity near the right side of the body at about one-quarter of the body length from the anterior pole; buccal ciliation similar to that of the C. campylum; 1 spherical macronucleus, a single micronucleus; the contractile vacuole is located in the central part of the body near the dorsal face. (ref. ID; 1219)
Elongate reniform; cytostome about one-tenth the body length; 55-60 ciliary meridians; preoral suture curved to left; macronucleus oval, central; a micronucleus; fresh water. (ref. ID; 1618)
Measurements; Length 100-150 um. (ref. ID; 1219)
90-150 um long. (ref. ID; 1618)
70-80 x 34-44 um. (ref. ID; 3342)

Colpidium echini (Russo) (ref. ID; 1618)
Description; In the intestinal caeca of Strongylocentrotus lividus; 24 longitudinal ciliary rows; cytostome at anterior third. (ref. ID; 1618)
Measurements; 37-64 (55) by 21-28 (25) um. (ref. ID; 1618)

Colpidium striatum Stokes, 1886 (ref. ID; 1622) reported year? (ref. ID; 1618, 5462) reported author and year? (ref. ID; 65)
Description; Similar to the C. campylum; contractile vacuole further posterior; in standing water. (ref. ID; 1618)
Measurements; 50 um long. (ref. ID; 1618)