With the new search tool in the Cat-eLog, you can actually list species of Corydoras (or species of any other genus/family) and select a temperature range that you wish them to be OK with.
For example, if you enter "Callichtyidae" as family, "Corydoras" as genus, and 27-28'C, you get
This.
[Note that entering 25-28 gives you fewer fish, because that will "unselect" the ones that are not happy at temperatures below 27'C].
--
Mats