Psilotricha Stein, 1859 (ref. ID; 2014, 7707)
Class Polyhymenophora: Subclass Spirotricha: Order Hypotrichida: Suborder Stichotrichina: Family Psilotrichidae (ref. ID; 2014)
Family Orthoamphisiellidae (ref. ID; 7423)

Synonym Hemiholosticha Gelei, 1954 (ref. ID; 2014); Pigostyla Tagliani, 1922 (ref. ID; 2014)

[ref. ID; 2014]
Small irregular oval to bun-shaped, dorso-ventrally flattened body, sometimes slightly pointed posteriorly. Cirri arranged in 2 marginal rows and 2 or 3 longitudinal midventral rows. Frontal cirri not differentiated, transverse cirri absent. Dorsal surface may be strongly arched with 3 or 4 ribs bearing dorsal cilia. AZM comparatively long extending up to two-thirds of body length. Macronucleus in two parts. Planktonic forms often completely filled with zoochlorellae. A few species have been described. We have followed Borror (1972) and Stiller (1974) by including the genus Hemiholosticha Gelei, 1954 in Psilotricha.
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)


Psilotricha acuminata Stein, 1859 (ref. ID; 1621) reported year? (ref. ID; 1618)
Measurements; 80-100 um long. (ref. ID; 1618)
Psilotricha succisa (Muller, 1786) Foissner, 1983 (ref. ID; 7423, 7707 redescribed paper) reported author and year? (ref. ID; 191)
Syn; Urospina bicaudata Gelei, 1944 (ref. ID; 7707)
Description; The rightmost ventral row five generates one within anlage and the posterior part of a N1 anlagen development. The second rightmost ventral row four is generated by a within anlage (proter) and the neokinetal anlage in row five (opisthe). Row three for opisthe is generated by the posterior cirri from row four as in Deviata abbrevescens. Cirri of unknown origin are located between row five and six. Two unique morphogenetic phenomena are reported, (1) proter's undulating membranes do not reorganize during division and (2) proter's leftmost (first) frontal cirrus develops in one anlage with the buccal cirri (row one). Opisthe's anlagen for row one is generated by an early forking of streaks right of the oral primordium. (ref. ID; 7423)