Litonotus Wrzesniowski, 1870 (ref. ID; 2013) or Lionotus Wrzesniowski, 1870 (ref. ID; 3690) ,
Class Kinetofragminophora: Subclass Gymnostomata: Order Pleurostomatida: Family Amphileptidae (ref. ID; 2013)

Synonym Hemiophrys Wrzesniowski (ref. ID; 1618); Lionotus Butschli, 1887 (ref. ID; 2013) reported year? (ref. ID; 1618)

[ref. ID; 2013]
Body laterally compressed, highly elongate with anterior neck-like region which bends towards the dorsal edge. Oral aperture a slit, on convex edge of neck extending less than halfway down the body. Ciliation present on both lateral surfaces. Ciliation on right surface takes the form of parallel longitudinal rows which do not converge on each other. There are some longer cilia on the neck region forming a mane-like structure. Trichocysts sometimes present. Macronucleus commonly in two spherical parts with single micronucleus wedged between the two. One to several contractile vacuoles present.
Quote; Colin R. Curds "British and other freshwater ciliated protozoa Part I Ciliophora: Kinetofragminophora" Cambridge University Press, 1982 (ref. ID; 2013)

Litonotus fasciola (Ehrenberg) (ref. ID; 1219, 1618, 2245, 3698) or (Ehrenberg) Wrzesniowski, 1870 (ref. ID; 3115)
Syn; Amphileptus fasciola Ehrenberg, 1838 (ref. ID; 3115); Dileptus fasciola Fromentel, 1874 (ref. ID; 3115); Loxophyllum fasciola Claparede & Lachmann, 1981 (ref. ID; 3115); Vibrio fasciola O.F. Muller 1786 (ref. ID; 3115)
Description; Body elongated; right side flat, left side more or less convex; anterior and posterior parts flattened and hyaline; mouth a long slit, about one-third to one-half the total length of body. (ref. ID; 1219)
Elongate flask in form; hyaline; with flattened neck and tail, both of which are moderately contractile; posterior end bluntly rounded; without trichocysts; neck stout, bent toward the dorsal side; cytostome a long slit; contractile vacuole posterior; two spherical macronuclei between which a micronucleus is located; fresh water and probably also in salt water. (ref. ID; 1618)
Measurements; 100 um long. (ref. ID; 1618)
Litonotus fasciola (O.F. Muller) Wrzesniowski, 1870 (ref. ID; 2316) reported year? (ref. ID; 1335)
Description; The body had a distinctive 'neck' with longer cilia giving this area a mane-like appearance. Single contractile vacuole present. (ref. ID; 2316)
Measurements; Length 90 um. (ref. ID; 2316)
Litonotus lamella (ref. ID; 7255)
Description; Litonotus lamella is about 250 um long about 80 um wide. The body is laterally flattened (compression) and, as a consequence, the ventral and dorsal surfaces become virtual edges, namely the functional left and right edge, respectively, while the right and left sides become, functionally speaking, the ventral and dorsal surfaces, respectively. The mouth opens about one-third the way along the left edge, at what can be described as a "neck" (Curds 1982). At that level, 150-200 toxicysts are ready to the discharged after contact with potential prey. The somatic ciliature is arranged mainly along kineties on the right side (functionally the ventral surface). (ref. ID; 7255)
Locomotory behavior and predatory behavior. (ref. ID; 7255)
Litonotus lamella (Ehrenberg) Schewiakoff, 1896 (ref. ID; 3115) reported year? (ref. ID; 1219, 1629, 1896, 2245) or Schewiakoff (ref. ID; 3698)
Syn; Loxophyllum lamella Claparede & Lachmann, 1861 (ref. ID; 3115); Trachelius lamella Ehrenberg, 1829 (ref. ID; 3115)
Description; Anterior and posterior parts flattened, ventral side convex, neck bent towards the dorsal side; mouth slit-like, about one-third of the central side, clearly visible only when the ciliate is feeding; cilia only on the right side, large individuals with 10-15 longitudinal rows cilia, smaller specimens with about 3 rows only; left side without any cilia; trichocysts at the edge of the mouth-slit and at the posterior pole; 2 spherical macronuclei, between which a micronucleus is located; contractile vacuole single, close to the posterior end. (ref. ID; 1219)
Measurements; Length 40-200 um. (ref. ID; 1219)
Litonotus lamella var. uninucleolata Schewiakoff, 1896 (ref. ID; 645)
Description; Length 30 to 50 um. The body is flattened in such a way as to produce a convex ventral outline and a sigmoid dorsal outline. The left side is bare and bulges outward; the right side bears 6 rows of cilia. The anterior end is narrowed like a neck, and there is a flattened tail at the caudal end. A distinguishing feature is the radial array of trichocysts in the tail region. The mouth slit is also provided with sturdy trichocysts, and others are scattered in the cytoplasm. A contractile vacuole occupies the posterior end of the rounded part. L. lamella has degeneration forms. Small forms, 40 um in length, sometimes have 3 kineties, whereas individuals as large as 200 um have 10-15 (Kahl 1930-1935). The L. lamella population in Solar Lake uniformly had only one macronucleus. This is unusual, for the macronucleus normally consists of 2 oval parts. But the conjugants observed also had one macronucleus, so that it can be assumed that the single nucleus is not an interphase nucleus. The specimens studied by Penard (1922) also included forms with a single macronucleus. Apart from the nucleus, the ciliate has all the characteristics of L. lamella. For this reason Wilbert & Kahan regard the Solar Lake population as a variety. L. lamella var. uninucleaolata feeds on ciliates. (ref. ID; 645)
Habitats; According to Bick & Kunze (1971), the optimal range is in fresh water. The animals can also tolerate salinity as high as 35 o/oo in thalassogenic brackish water, and up to 3.5 o/oo in althlassogenic water. (ref. ID; 645)
Lionotus carinatus Stokes, 1885 (ref. ID; 1622) reported year? (ref. ID; 3342)
Measurements; 40-60 x 9-12 um. (ref. ID; 3342)
Lionotus lamella (Ehrenberg, 1829) (ref. ID; 3593) reported year? (ref. ID; 5624) or (Ehrenberg) Schewiakoff, 1896 (ref. ID; 1622, 2117) reported year (ref. ID; 3342, 3690)
Measurements; 70-140 x 20-40 um. (ref. ID; 3342)
Lionotus lamellus Ehrenberg (ref. ID; 3544)
Measurements; Length 48-65; breadth 25-27 um. (ref. ID; 3544)