Kinorhyncha

noun plural

Ki·​no·​rhyn·​cha ˌkī-nō-ˈriŋ-kə  ˌkin-ō- 

: a class of Aschelminthes or a separate phylum comprising minute marine worms of uncertain systematic position having certain resemblances to arthropods and annelids but probably more closely related to the nematodes