[Answer]-Django Model Inheritance — prevent subclass instances from appearing in superclass admin

This is normal behavior. From database point of view table primary key of PubMedArticle just refers to Article table. So for each record in PubMedArticle table must be a record in Article table.

Now to the admin. The are two ways:

1) Make Article model abstarct – a good idea if you dont need unique primary keys to all of your articles.
2) Customize django admin list query.