Tanystomivore

A tanystomivore is a carnivorous archozoan that eats primarily optifish. Tanystomivores are Coria 4UKM's analogue to Earth's piscivores.

Some archozoans are not completely tanystomivorous, often preying on mollusc-like aquatic archozoans or land archozoans in addition to optifish, while others are strictly dependent on optifish for food. The name "tanystomivore" is derived from tanystome(the group which all derived optifish belong to, it also means  long mouth  ).

There exists classifications of primary and secondary tanystomivores. Primary tanystomivores, also known as "specialists", shift to this habit in the first few months of their lives. Secondary tanystomivores will move to eating primarily optifish later in their lifetime. It is hypothesized that the secondary tanystomivores' diet change is due to an adaptation to maintain efficiency in their use of energy while growing.