[ref. ID; 2014]
Narrow elongate body often tapered posteriorly into a tail region. 2 rows of marginal cirri and 2 rows of midventral cirri extending into the frontal region although at least 3 anterior frontal cirri are clearly differentiated. Transverse cirri absent. May or may not possess caudal cirri. The peristome region small (less than quarter body length) in a narrowed frontal region. 2 or 4 macronuclei with associated micronuclei. Several species have been described.
The question of presence of absence of transverse cirri in the genus is controversial. Here we adopt the view of Kahl (1932), with his reservations, rather than Borror (1972), or Jankowski (1979) and reserve the genus Paruroleptus for similar forms with transverse cirri. Jankowski (1978) created a new genus Perisincirra for U. kahli Groliere, 1976. Borror (1979) transferred the genus to the Urostylidae.
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; 3925]
Usually one row each of right and left marginal cirri; midventral cirri in typical zigzag series, 2 cirri per original oblique ciliary streak; frontal cirri hypertrophied, similar to Holosticha; transverse cirri often reduced or absent; posterior end of cell narrowed into "tail".
Type Genus (by subsequent designation); Uroleptus musculus (O. F. Muller, 1773) Ehrenberg, 1831
Uroleptus is a poorly understood genus of fresh-water hypotrichs currently plagued by an astoundingly complex nomenclature and dozens of superficially described nominal species. The number of transverse cirri is extremely variable within a clone; indeed many ciliates identified as being in the genus Uroleptus lack transverse cirri. Uroleptus musculus (O. F. Muller, 1773), the type species, possesses midventral cirri homologous to those of Urostyla; hence Uroleptus should be cofamilial with the remainder of this assemblage. Nomenclature of Uroleptus is further clouded by continuing confusion of this ciliate, which has midventral cirri, with vermiform hypotrichs from fresh water, soil, mosses, and hypersaline environments that lack midventral cirri. (ref. ID; 3925)

• Uroleptus agilis Engelmann, 1862 (ref. ID; 1621)
• Uroleptus caudatus (Claparede & Lachmann, 1858) (ref. ID; 1621, 4488) reported author and year? (ref. ID; 191)
• Uroleptus dispar Stokes, 1886 (ref. ID; 1621, 4488)
• Uroleptus elongatus Fernandez-Leborans, 1981 (ref. ID; 4695)
• Uroleptus filum Ehrenberg, 1833
  See; Spirostomum caudatum (ref. ID; 4610)
• Uroleptus gallina (Mueller, 1786) Foissner et al., 1991 (ref. ID; 4488, 4609) reported author and year? (ref. ID; 1629, 4471)
  Syn; Trichoda gallina Mueller, 1786 (ref ID; 4609)
• Uroleptus gibbus (Claparede & Lachmann, 1858) (ref. ID; 1621) reported year? (ref. ID; 3491)
• Uroleptus halseyi Calkins, 1929 (ref. ID; 1621) reported year? (ref. ID; 1618)
• Uroleptus hospes Ehrenberg, 1831
  See; Mucotrichidium hospes (ref. ID; 4785)
• Uroleptus kahli Buitkamp (ref. ID; 2365 original paper)
• Uroleptus lemani (ref. ID; 4609)
• Uroleptus limnetis Stokes, 1885 (ref. ID; 1621) reported year? (ref. ID; 1618)
• Uroleptus longicaudatus Stokes, 1886 (ref. ID; 1621) reported year? (ref. ID; 1618)
• Uroleptus matthesi Wenzel, 1953 (ref. ID; 3593 original paper)
• Uroleptus mobilis Engelmann, 1861 (ref. ID; 1335, 1621) or 1862 (ref. ID; 4777)
  See; Engelmanniella mobilis (ref. ID; 4777)
• Uroleptus mobilis var. americanus var. provis Calkins, 1929 (ref. ID; 1621)
• Uroleptus muscorum Kahl, 1932 (ref. ID; 3593) reported author and year? (ref. ID; 1621, 3925)
• Uroleptus musculus (Kahl, 1932) (ref. ID; 4609)
  Syn; Holosticha contractilis Dragesco, 1970 (ref. ID; 4609); Paruroleptus musculus Kahl, 1932 (ref. ID; 4609)
• Uroleptus musculus (O. F. Muller, 1786) (ref. ID; 1621, 1629) or (O. F. Muller, 1773) Ehrenberg, 1831 (ref. ID; 3925)
  See; Paruroleptus gallina (ref. ID; 4785)
• Uroleptus opisthobolus (Stokes, 1886) (ref. ID; 1621)
• Uroleptus pisces (ref. ID; 4471)
• Uroleptus piscis (O. F. Muller, 1773) Ehrenberg, 1831 (ref. ID; 4609)
  Syn; Trichoda piscis O. F. Muller, 1773 (ref. ID; 4609)
• Uroleptus piscis (O. F. Muller) Stein, 1858 (ref. ID; 3116) or (O. F. Muller, 1786) Stein (ref. ID; 1219, 1621, 1629, 2245)
• Uroleptus rattulus Stein, 1859 (ref. ID; 1621, 1629, 3690, 4609)
• Uroleptus sphagni Stokes, 1886 (ref. ID; 1621, 2099)
• Uroleptus violaceus Stein, 1859 (ref. ID; 1621)
• Uroleptus zignis Entz, 1884 (ref. ID; 1621)