Definition of Chaetognatha in English:

Chaetognatha

Zoology
  • A small phylum of marine invertebrates that comprises the arrow worms.

    • ‘Also unresolved are the phylogenetic positions of Cycloneuralia, Chaetognatha, Gnathostomulida, Cycliophora, and Micrognathozoa.’
    • ‘Instead, Rouse's conclusion that ‘groups such as the Arthropoda, Brachiopoda, Chaetognatha, Ectoprocta, Gastrotricha, Phoronida may have lost a prototroch’ is totally gratuitous, and remains unaddressed by his own data.’
    • ‘Pelagic species were from the Chaetognatha, Cnidaria, Crustacea, Ctenophora, and Mollusca, and benthic species were from the Chordata, Crustacea, Mollusca, and Echinodermata.’
    • ‘Nielsen and Nielsen et al. come to generally comparable results, although sometimes the additional taxa Rotifera, Acanthocephala and Chaetognatha were included in Aschelminthes.’
    • ‘Also absent are the Chaetognatha (arrow-worms), which have been considered the basalmost branch of the Deuterostomia in the past, but are currently regarded by many as basal protostomes.’

Origin

Modern Latin (plural), from Greek khaitē ‘long hair’ + gnathos ‘jaw’.

Pronunciation

Chaetognatha

/kēˈtäɡnəTHə/