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My understanding of Corydoras?s taxonomy. Please comment on it.

Kingdom： Animal
Phylum： Chordata
Subphylum： Vertebrata
Class： Osteichthyes
Subclass： Actinopterygii
???：Euteleostei
Order： Siluriformes
Family： Siluridae
Subfamily： Corydoradinae
Genus： Corydoras

The family should be Callichthyidae, and ??? should read Infradivision.

I know that there are some debate on the taxonomy tree. Any other position suggestion???

The debate does not exist above the species level, and taxonomy (the names of organisms) is no longer a very debatable topic, as almost all of the debate lies in systematics (the phylogenetic relationships of organisms).
What you have there has not been (and will not) a subject of debate.

Oh... Thank you.

I don't have much biography knowledge.