Definitions

from The Century Dictionary.

  • A group of transparent animals consisting of the family Sagittidæ, the affinities of which are still undetermined.

from the GNU version of the Collaborative International Dictionary of English.

  • noun plural (Zoöl) a phylum consisting of the arrowworms, a group of small active transparent free-swimming marine worms, of which the genus Sagitta is the type. They have groups of curved spines on each side of the head.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • proper noun A taxonomic phylum within the superphylum Protostomia — the arrow worms or chaetognaths.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun arrowworms: a group of small active transparent marine worms

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Ancient Greek χαίτη ("flowing hair") + γνάθος ("jaw")

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Examples

  • Zooplankton composition shows a high abundance of Calanoid Copepoda, Chaetognatha, Salpidae and Hydromedusae.

    Patagonian Shelf large marine ecosystem 2008

  • Of the phyla you haven't seen alive, I have seen: Chaetognatha, Nematomorpha, Nemertea, Sipuncula, Echiura which is really a subgroup of Annelida, Phoronida and Brachiopoda.

    So many phyla so little time AYDIN 2008

  • The number of species in the upper 200 meters (m) of the pelagic oceanic environment is well known for four groups of animals, the Euphausicacea, Chaetognatha, Pteropoda and Copepoda, which dominate the biomass everywhere.

    Marine biodiversity 2007

  • The number of species in the upper 200 meters (m) of the pelagic oceanic environment is well known for four groups of animals, the Euphausicacea, Chaetognatha, Pteropoda and Copepoda, which dominate the biomass everywhere.

    Featured Articles - Encyclopedia of Earth 2010

  • Arrow worms (Phylum Chaetognatha) are abundant planktonic organisms and important predators in many food webs; yet, the classification and evolutionary relationships among chaetognath species remain poorly understood.

    ScienceBlogs Channel : Life Science 2010

  • Instead, I will list a compilation of some of the phyla of which I have yet to see a live member: Acanthocephala, Chaetognatha, Gnathostomulida,

    SNAIL'S TALES 2008

  • Barcoding of Arrow Worms (Phylum Chaetognatha) from Three Oceans: Genetic Diversity and Evolution within an Enigmatic Phylum

    ScienceBlogs Channel : Life Science 2010

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