Tintinnidium Kent, 1881 (ref. ID; 2014) or 1882 (ref. ID; 3596, 3597)
Class Polyhymenophora: Subclass Spirotricha: Order Oligotrichida: Suborder Tintinnina (ref. ID; 2014)

[ref. ID; 2014]
Lorica elongate, soft and gelatinous, tends to be irregular but generally tubular with rounded aboral end. Body of animal approximately trumpet-shaped, constricted sharply in middle so that posterior half is very narrow, contractile and attached to the rounded base of the lorica. AZM strongly developed. Base of the lorica normally attached to submerged vegetation but it can also be planktonic.
See Tintinnopsis.
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)

[ref. ID; 3596]
Lorica free or adherent, usually elongate sac-shaped, sometimes irregularly formed, with or without a collar; aboral end generally closed; wall soft, made of viscous materials or loosely agglometrated. Tintinnidium includes many fresh-water forms. Marine species usually occur in coastal waters. (ref. ID; 3596)

Tintinnidium fluviatile Stein, 1833 (ref. ID; 3116), 1863 (ref. ID; 909, 1621, 1629, 2245) reported year? (ref. ID; 1219, 1618, 3342) or (Stein, 1863) Kent, 1881 (ref. ID; 4488, 4609), (Stein, 1863) Kent, 1882 (ref. ID; 3280) reported year? (ref. ID; 3772) reported author and year? (ref. ID; 191, 5388, 7768)
Syn; Tintinnus fluviatile Stein, 1863 (ref. ID; 3280, 4609)
Description; Lorica elongated, 40-50 um long, of irregular form, mostly tube-like; posterior end closed; wall mucilaginous with foreign bodies (e.g., shells of diatoms) attached to it; free-swimming (planktonic) or attached to substrate (T. fluviatile var. emarginatum Maskell); body more or less trumpet-shaped and fixed to the bottom of the case by means of a myoneme-bearing contractile stalk; well-developed adoral zone of membranelles at the anterior pole running clockwise to the mouth; body ciliation restricted to few transverse rows of cilia just behind the buccal area; 1 oval-reniform macronucleus in the anterior half of the body; a single contractile vacuole located somewhat laterally in the anterior region. The very similar T. semiciliatum Sterki may occur also in the plankton of lakes and reservoirs; the identification being rather difficult. (ref. ID; 1219)
Lorica various in shape, often tubular; oral margin irregularly formed; aboral end somewhat flattened, rounded or bluntly conical; wall loosely composed to present a fragile appearance. (ref. ID; 3280)
Measurements; Lorica 100-200 by 45 um. (ref. ID; 1618)
Length 52-180; breadth 38-75 um. (ref. ID; 3280)
109 x 26 um. (ref. ID; 3342)
Tintinnidium fluviatile var. emarginatum Maskell, 1887 (ref. ID; 4609) or 1888 (ref. ID; 1621, 2245) reported year? (ref. ID; 1219, 3343)
See; Tintinnidium semiciliatum (ref. ID; 4609)
Measurements; Length of lorica 70-350 um. (ref. ID; 3343)
Tintinnidium mucicola (Claparede & Lachmann, 1858) Daday, 1887 (ref. ID; 3596) reported year? (ref. ID; 3597)
Description; Lorica irregularly capsular, often nearly cylindrical, 2.5-3.1 oral diameters in length; near oral margin more or less constricted; oral end roughly uneven; aboral end usually rounded; wall thin, somewhat translucent, loosely covered with scarce foreign particles. (ref. ID; 3596)
Comments; The species is differs from T. neapolitanum Daday in the absence of the oral expansion. This species is a neritic and rather cold water form. (ref. ID; 3596)
Measurements; Length 75-100; oral diameter 30-33 um. (ref. ID; 3596)
Length 100-190; oral diameter 30-50; greatest transdiameter of the lorica 50-160 um. (ref. ID; 3597)
Tintinnidium pusillum Entz, 1909 (ref. ID; 909, 1629, 3280, 4488, 4609, 4613) reported author and year? (ref. ID; 191)
Description; Lorica elongate, tubular, frequently somewhat bent, 2.5-4.2 oral diameters in length; oral margin roughened; sides nearly parallel; aboral end variously formed, rounded or conical with a blunt terminal; wall not so fragile, with rather coarse agglomerated particles. (ref. ID; 3280)
Comments; The species, though similar to Tdm. fluviatile (Stein), is easily distinguished by its smaller and more slender form and from Tintinnopsis cylindrata Kofoid & Campbell also an allied species, by the loose structure of the wall and smaller dimensions. It has been only once reported by Entz (1909) from the Danube near Budapest, Hungary. (ref. ID; 3280)
Measurements; Length 53-80; oral diameter 19-21 um. (ref. ID; 3280)
Tintinnidium semiciliatum Sterki, 1879 (ref. ID; 1621, 1629) reported year? (ref. ID; 1219, 1618) or (Sterkii, 1879) Kent, 1881 (ref. ID; 4609), (Sterkii, 1879) Kent, 1882 (ref. ID; 3280) reported author and year? (ref. ID; 191)
Syn; Strombidinopsis gyrans Kent, 1881 (ref. ID; 4609); Tintinnidium fluviatile var. emarginatum Maskell, 1887 (ref. ID; 4609); Tintinnidium ranunculi Penard, 1922 (ref. ID; 4609); Tintinnus semiciliatus Sterkii, 1879 (ref. ID; 3280, 4609)
Description; On plants in fresh water. (ref. ID; 1618)
Lorica more or less irregular in general outline, 1.3-2.3 breadth in length; wall loosely composed, agglomerated particles mainly consisting of minute yellow discs of diameters of 4-10 um. (ref. ID; 3280)
Comments; In the writer's materials loricae of this species are usually dark yellow in color due to numerous yellowish discs attached to the wall, while are shells of living organisms. The species is similar to Tdm. fluviatile (Stein) in form and size, but can be readily distinguished by the marked yellow color and minute discs distributed thickly on the wall. It was more frequently observed in winter than in summer as in Tdm. fluviatile. Bog lakes from which this Ciliata was secured are of the eutrophic or dystrophic type according to the writer's classification of bog waters. (ref. ID; 3280)
Measurements; 40-60 um long. (ref. ID; 1618)
Length 70-125; breadth 30-75 um. (ref. ID; 3280)