If it has long thin leaves it's this one
Incorrectly sold as A. lanceolata (which doesn't exist).
Most commercial Anubias is this large plant
Anubias barteri barteri accounts for nearly all Anubias in the trade.
When you see an utterly huge leaved Anubias, it's this one.
This is the one we never see.
If it's small, it's this one.
This is the small one. Names like "petite" and "micro" exist and are not part of the scientific name.