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[kee-tog-nath, -tuh g-] /ˈki tɒgˌnæθ, -təg-/
any animal of the phylum Chaetognatha, comprising the arrowworms.
Also, chaetognathan
[kee-tog-nuh-thuh n] /kiˈtɒg nə θən/ (Show IPA),
chaetognathous. belonging or pertaining to the Chaetognatha.
1885-90; < New Latin Chaetognatha, neuter plural of chaetognathus; see chaeto-, -gnathous Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for chaetognath


any small wormlike marine invertebrate of the phylum Chaetognatha, including the arrowworms, having a coelom and a ring of bristles around the mouth
Word Origin
C19: New Latin Chaetognatha, literally: hair-jaw, from chaeta + Greek gnathos jaw
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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chaetognath in Science
Any of various small, wormlike marine invertebrates of the phylum Chaetognatha, having often transparent or translucent bodies that are pointed at one end. The head has small hooks for grasping prey, and it contains a large cerebral ganglion of sensory nerves. Chaetognaths are popularly called arrowworms, and are thought to be related to the echinoderms and chordates.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for chaetognath


any member of the invertebrate phylum Chaetognatha, a group of small wormlike marine animals with transparent to translucent or opaque arrow-shaped bodies. The phylum consists of about seven extant genera and one fossil genus. There are more than 50 species, most of which are in the genus Sagitta. The size of arrowworms ranges from about 3 millimetres to more than 100 millimetres; species inhabiting colder waters generally are larger than those from tropical seas. Chaetognatha are hermaphroditic (having both male and female sex organs, or gonads). The body is divided into head, trunk, and tail by two transverse walls or membranes and has lateral fins and a tail fin. Respiratory, circulatory, and excretory systems are not properly developed

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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