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The small, free-swimming, ciliated aquatic larva of various invertebrates, including certain mollusks and annelids.

[Greek trokhos, wheel (from trekhein, to run) + -phore.]
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.


(ˈtrɒkəˌfɔː) or


(Zoology) the ciliated planktonic larva of many invertebrates, including polychaete worms, molluscs, and rotifers
[C19: from Greek trokhos wheel + -phore]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈtrɒk əˌfɔr, -ˌfoʊr)

a ciliate, free-swimming larva common to several groups of invertebrates, as many mollusks and rotifers.
[1890–95; < Greek trochó(s) wheel + -phore]
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 ?
Remarks: Trochophores and metatrochophores are frequently found in zooplankton surveys, because a planktotrophic or lecithotrophic larvae are present in most of the reproductive strategies of Spionidae (Wilson, 1991).
Influence of lowered salinity and elevated cadmium on the survival and metamorphosis of trochophores in Capitella sp.
Hatching success (Stage 14) was calculated by dividing the number of trochophores by the starting number of fertilized eggs.
Trochophores and veligers were most abundant near the surface of the water (Ault 1985).
For example, for 3-day-old trochophores of the capitellid Mediomastus fragile (presumed to feed with opposed bands), maximum clearance was [approximately equal to]0.23 ml [d.sup.-1] (Hansen, 1993).
Trochophores are siphoned into 10 to 30-[m.sup.3] concrete tanks.
Homology of the ciliary bands of spiralian trochophores and other larvae.
After the initial mineralization, the larvae are often called trochophores and the new mineralized shell is homogenous and composed mostly of calcium carbonate (Eyster 1986).
The derivatives of this lineage, which would generally undergo cleavage arrest and become multiciliated to form the prototroch in canonical trochophores, remain mitotically active and develop a single cilium each in the Owenia hatchling.
Most larval indicators were significantly influenced by sampling date (H = 32.1 for number of trochophores; F = 4.74 for diameter of trochophores; H = 29.3 for number of veligers; F = 35.1 for diameter of veligers), but not by depth of residence (H = 0.7 for number of trochophores; F = 1.24 for diameter of veligers).