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Related to suctorian: Sporozoa, vorticella, Ciliatea, Tintinnid


Any of various aquatic protozoans of the subclass Suctoria that have a free-swimming ciliated immature form and a sessile, stalked adult form that lacks cilia and feeds by means of suctorial tentacles.

[From New Latin Sūctōria, class name, from neuter pl. of sūctōrius, suctorial; see suctorial.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Animals) a protozoan belonging to the class Suctoria, characterized by having suctorial tentacles with which it feeds
(Zoology) a variant form of suctorial
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(sʌkˈtɔr i ən, -ˈtoʊr-)

1. a suctorial animal.
2. a protozoan of the order Suctoria, which in the adult phase attaches to the substrate by a stalk and feeds by means of suctorial tentacles.
3. belonging or pertaining to the Suctoria.
[1835–45; < New Latin Suctori(a), <sūctōrius sucking (Latin sūg(ere) to suck + -tōrius -tory1)]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
Suctorian protozoans stop reproduction upon starvation, and starved individuals live longer than fed individuals (Kent 1981).
Active sludge contains four groups of protozoa: sarcodic, flagellate, ciliate infusoria, and suctorians, which absorb large amounts of bacteria thus controlling their optimal number.
The presence of peritrichous colonial ciliates identified as Epistylis and Vorticella spp., and suctorians identified as Acineta and Tokophrya spp., occurring as ectocommensals or epibionts was confirmed.