Definition of "Cyclostomata"

Cyclostomata

proper noun
1. A taxonomic class within the subphylum Vertebrata – the living jawless fishes: lampreys and hagfishes; the cyclostomes.
  Quotations
  Among fishes, we meet with the family of Cyclostomata, so called from their having a circular mouth, formed for suction.
  1834, Peter Mark Roget, Animal and Vegetable Physiology, volume 2 (in English), William Pickering, page 116
  Cyclostomata comprises two families of living jawless fishes: hagfishs (Myxinidae, 44 species) and lampreys (Petrymyzonidae, 41 species).
  2009, Shigehiro Kuraku et al., “Jawless Fishes (Cyclostomata)”, in The Timetree of Life (in English), Oxford University Press, page 317
2. A taxonomic order within the phylum Bryozoa – the Cyclostomatida.