Implicating abdomen → arthropod
Link to implication

Reason:

To discourage the use of multiple tags for the same thing, I suggest that the abdomen tag gets moved over to solely referring to the tagma form of abdomens, while stomach can be used when referring to the stomach. People aren't even referring to the abs with the abdomen tag, as it often depicts a gut with some fat to it, rather than the six-pack abs.

Related implications:
abdomen → tagmata
throax → tagmata
thorax → arthropod

Tagmata is plural for "Tagma," which means the separated body parts found on arthropods. The reason I'm suggesting tagmata as the tag is that if people type in tagme but hit A instead of E, it could cause problems.