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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Parurosoma

Parurosoma Gelei, 1954 (ref. ID; 2014, 4894)

Class Polyhymenophora: Subclass Spirotricha: Order Hypotrichida: Suborder Stichotrichina: Family Holostichidae (ref. ID; 2014)
Family Oxytrichidae Ehrenberg, 1838: Subfamily Oxytrichinae Jankowski, 1979 (ref. ID; 4894)

[ref. ID; 2013]
Elongate posteriorly pointed body with 2 rows of marginal cirri on each side separated by an open midventral region which may bear only isolated cirri. Several frontal cirri and transverse cirri present. The peristomial field is narrow and the AZM extends only a quarter to third of the body length. Contractile vacuole equatorial. 2 macronuclei each with an adjacent micronucleus. Single species genus originally isolated from Hungary. Borror (1972) placed this genus in Pleurotricha. Jankowski (1979) disputes this but without supporting the validity of the genus.
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; 2013)

[ref. ID; 4894]
Improved characterization; Adoral zone of membranelles, undulating membranes, and frontoventral cirri similar to in Urosoma. Postoral ventral cirri in dense cluster underneath buccal vertex. Two pretransverse ventral and five transverse cirri. Two right and two left rows of marginal cirri. Four, sometimes five dorsal kineties. Caudal cirri present. Dorsal morphogenesis very likely in Urosomoida pattern. (ref. ID; 4894)
Remarks; Monotypic, i.e. includes only the type species, which has to be redescribed in detail. Gelei (1954) classified Parurosoma as subgenus of Holosticha. Thus, Corliss (1979) and Tuffrau (1987) included it in the family Holostichidae. Borror (1972) synonymized it with Pleurotricha, which has, however, a rigid body and lacks caudal cirri. (ref. ID; 4894)
Type species (by monotypy); Holosticha (Parurosoma) dubium Gelei, 1954 (ref. ID; 4894)
  1. Parurosoma dubium Gelei, 1954 (ref. ID; 2129, 4894)
  2. Parurosoma granulifera (ref. ID; 2129, 4609)