Definition of Nematomorpha in US English:


plural noun

  • A small phylum that comprises the horsehair worms.

    • ‘Hairworms, or Nematomorpha, are a little-known group of parasites, which contains around 300 known species worldwide.’
    • ‘These are the horsehair worms or Nematomorpha and the Gastrotricha.’
    • ‘They concluded that Gastrotricha is the sister-taxon of a monophyletic clade comprising Nematoda, Nematomorpha, Priapulida, Kinorhyncha and Loricifera.’
    • ‘The hexagonal arrangement in both adults and larvae of the internal armature in the buccal apparatus may be plesiomorphic, a shared character with Nematoda and Nematomorpha (Nematoida, subgroup of Cycloneuralia).’
    • ‘The recently published Ecdysozoa hypothesis suggests a closer relationship of the Scalidophora, Nematode, Nematomorpha, Tardigrada, Onychophora, and Arthropoda.’


Modern Latin (plural), from Greek nēma, nēmat- ‘thread’ + morphē ‘form’.