Nematomorpha

noun plural
Nem·​a·​to·​mor·​pha | \ˌnem-ət-ə-ˈmȯr-fə, nə-ˌmat-ə- \

Medical Definition of Nematomorpha 

: a phylum that is related to the phylum Aschelminthes and comprises the horsehair worms which were formerly often grouped with the nematodes but are distinguished from these by possession of a true body cavity, gonads discontinuous with their ducts, and an atrophied digestive tract in the adult

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