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Stomatogenesis and morphological re-description of the marine ciliate, Philasterides armatalis (Protozoa: Ciliophora: Scuticociliatida)

Published online by Cambridge University Press:  15 February 2008

Xiaozhong Hu ,
Alan Warren  and
Weibo Song
Xiaozhong Hu*
Affiliation:
Laboratory of Protozoology, Ocean University of China, Qingdao 266003, People's Republic of China Department of Zoology, Natural History Museum, Cromwell Road, London, SW7 5BD, UK
Alan Warren
Affiliation:
Department of Zoology, Natural History Museum, Cromwell Road, London, SW7 5BD, UK
Weibo Song
Affiliation:
Laboratory of Protozoology, Ocean University of China, Qingdao 266003, People's Republic of China
*
Correspondence should be addressed to: Xiaozhang Hu Laboratory of Protozoology OceanUniversity of ChinaQingdao 266003People's Republic of China email: xiaozhonghu@ouc.edu.cn
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Abstract

The stomatogenesis and morphology of the marine planktonic ciliate Philasterides armatalis collected from mollusc-culturing waters off the coast of Qingdao, China, were studied using a differential interference contrast microscope for observations in vivo and protargol impregnation. In terms of its infraciliature, this species possesses typical characteristics of the genus Philasterides: bipartite paroral membrane, the anterior part double-rowed and the posterior part in a zig-zag-formation, and three well-defined membranelles arranged in Paranophrys-pattern. This investigation confirms the dual origin of the buccal apparatus in the opisthe, one derived from the scutica and the other from the paroral membrane. Its stomatogenesis belongs to the ‘Philasterides’ sub-type, although it differs from its only congener P. armata, in that paroral membrane 1 gives rise to the paroral membrane and the scutica in the proter, and paroral membrane 2 forms the paroral membrane, membranelles 1 and 2 and the scutica in the opisthe. Based on stomatogenetic data, the phylogenetic positions of several genera in the suborder Philasterina are reconsidered.

Keywords

infraciliaturemorphogenesisPhilasterides armatalisscuticociliates
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 88 , Issue 1 , February 2008 , pp. 29 - 34
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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