1. Alternative name for Cyclostomata (Agnatha))

2. Thus, histological structure of Cyclostomata testis is at a lower stage of development than in other Anamnia

3. Conodont — the problematical small tooth like fossil of the Cambrian, Silurian and Devonian periods which could well be a tooth of Cyclostomata … Dictionary of ichthyology

4. Superclass Agnatha is made up of living and extinct forms. In older classifications, extant forms—that is, the lampreys and hagfishes— were grouped together as Cyclostomata (round mouth)