Morphological studies on three marine pathogenetic ciliates

Song Weibo; Wei Jun

Acta Hydrobiologica Sinica 22(4): 359-366


Accession: 011017002

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Three marine pathogenetic ciliates have been morphologically studied: Nassula labiata Kahl, 1933; Paranophrys carnivora Czapik and Wilbert, 1986 and Cyclidium citrullus simile n. subspec. The first two organisms are new record in China, which are either a red tidal form (Nassula labiata) or likely belonging to facultative parasitic forms (Paranophrys carnivora). Diagnostic features of Cyclidium citrullus simile n. subspec.: small (12-16 X 7-11mum) marine form with one macronucleus; contractile vacuole caudally located; 10-11 bipolar somatic kineties with evenly distributed cilia; posterior part of SKn-1, like that in C. glaucoma, having close-set packed basal bodies. Ecological feature: saprobic marine water, salinity 31permill, temperature about 23degreeC. Type specimens as protargol impregnated slides are deposited in the Laboratory of Protozoology, College of Fisheries, Ocean University of Qingdao, Qingdao 266003, P. R. China. The new subspecies differs from the nominative Cyclidium citrullus citrullus Cohn, 1865( = Cyclidium citrullus Cohn, 1865) n the different biotopes and smaller size (12-16vs. 20-30mum). We agree with some previous conclusions that the similar, well-known species, C. glaucoma Muller, 1786, should be considered as a strict freshwater form, which can be distinguished from Cyclidium citrullus simile by evidently different body shape, habitats and larger size (25-30vs. 12-16mum).