Journal of Ocean University of China
(Oceanic and Coastal Sea
Research)
ISSN 1672-5182, April 30,2005,Vol.4,No.2,pp.137-144
http://www.ouc.edu.cn/xbywb/
E-mail:xbywb@mail.ouc.edu.cn
Notes on Two Marine Ciliates from the Yellow Sea,
China: Placus salinus and Strombidium apolatum
(Protozoa, Ciliophora)
XU Dapeng, SONG Weibo*, and HU Xiaozhong
Laboratory of Protozoology, KLM, Ocean University of China, Qingdao 266003, P.R.China
(Received November 12,2004; accepted March 4,2005)
Abstract The living morphology and infraciliature of two rare marine ciliates, Placus salinus
Dietz, 1964 and Strombidium apolatum Wilbert and Song, 2005, collected from the coastal waters
near Qingdao, China, were investigated by in vivo observation and protargol impregnation
technique. The improved diagnosis for Placus salinus is as follows: medium-sized marine Placus,
in vivo (50-60)μm×(30-40)μm; cell elliptical to barrel-shaped; 28-31 somatic kineties; single
macronucleus usually ellipsoid and one micronucleus located in the indention of the macronucleus;
one contractile vacuole posteriorly positioned. Strombidium apolatum is characterized by: marine
strombidium (40-60)μm×(30-45)μm in vivo, cordiform in shape with somewhat pointed
posterior end and conspicuous apical protrusion; extrusomes prominent, about 15μm in length and
evenly arranged along the circle kinety; about 16 collar and 5-6 buccal membranelles; one elongate
macronucleus and one micronucleus; circle and ventral kineties consisting of about 53 and 45
dikinetids respectively.
Key Words marine ciliates; Placus salinus; Strombidium apolatum
Number
ISSN 1672-5182(2005)02-137-08