an informal unit and never ventured to forward a Linnaean rank for the group. The term ichthyopsida means fish-face or fish-like as opposed to the sauropsida or lizard-face animals (reptiles and birds) and the mammals. The group representing an evolutionary grade rather than a clade, the term anamniote is now used as an informal way of denoting the physical property of the group, rather than as a systematic unit. References Zoology