title: A new species of the genus Metacystis (Ciliophora, Prostomatida, Metacystidae) from a wastewater treatment plant.
abstract: Unusual prostomatid specimens were found in the biological reactor of a wastewater treatment plant in a health resort in Valencia, Spain. These ciliates were attached to flocs unlike other free-swimming prostomatid ciliates described to date in the mixed liquor of activated sludge plants. The morphological study of this species led to a typically different combination of characteristics: elongated cell shape, 20-30 somatic kineties, 2 perioral kineties, and 1 circumoral kinety, 1 large vacuole protruding at the terminal end, a lorica tapered toward the aperture with a smooth neck, and 11-16 annular ridges. These characteristics place this representative as a new species of the genus Metacystis-Metacystis galiani n. sp. This species became the dominant population within the biological reactor when high values of conductivity (4,244 mS/cm) and temperature (26.8 degrees C) were recorded.
authors.affiliation: Departamento de Microbiología III, Facultad de Biología, Universidad Complutense, Madrid, Spain. arregui@bio.ucm.es
authors.forename: Lucía
authors.initials: L
authors.lastname: Arregui
authors.forename: Blanca
authors.initials: B
authors.lastname: Pérez-Uz
authors.forename: Andrés
authors.initials: A
authors.lastname: Zornoza
authors.forename: Susana
authors.initials: S
authors.lastname: Serrano
mesh_terms: D016798:Ciliophora / Q000145:classification / Q000235:genetics / Q000254:growth & development / Q000302:isolation & purification*; D012722:Sewage / Q000032:analysis / Q000469:parasitology*; D013030:Spain; D018508:Water Purification
chemical_list: D012722:Sewage