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Divisional morphogenesis in the marine ciliate Holosticha warreni (Ciliophora: Hypotrichida)

Published online by Cambridge University Press:  31 October 2000

Xiaozhong Hu
Affiliation:
Aquaculture Research Laboratory, Ocean University of Qingdao, Qingdao 266003, People's Republic of China
Weibo Song
Affiliation:
Aquaculture Research Laboratory, Ocean University of Qingdao, Qingdao 266003, People's Republic of China
Alan Warren
Affiliation:
Department of Zoology, The Natural History Museum, Cromwell Road, London, SW7 5BD, UK

Abstract

The cortical development of the marine hypotrichous ciliate Holosticha warreni, found in coastal waters near Qingdao, China, was investigated using the protargol impregnation method. In the proter, disorganization of the parental adoral zone of membranelles and undulating membranes contributes to the formation of its oral primordia which replace the parental buccal apparatus completely. Cirral anlagen in both division parts derive from the breaking of primary primordia. Most midventral cirri join in the formation of these primordia which occurs de novo separately from the oral primordia. Each of the 11 to 13 oblique streaks divides into three segments (new cirri) while the last two anlagen produce four each. Two frontoterminal cirri derive from the posteriormost anlage. The marginal rows develop from the parental structure. The generation mode of dorsal kineties is of the ‘one group type’ without forming caudal cirri.

Type
Research Article
Copyright
2000 Marine Biological Association of the United Kingdom

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Divisional morphogenesis in the marine ciliate Holosticha warreni (Ciliophora: Hypotrichida)
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