Citong Shifu - "What are the names of your core stances?"
The ones WE practiced (aside from whatever came up in forms like "broken leg stance") were horse, bow, bird and cat. These were bread and butter, every class, part of the warm-up routine, stances. We also did "dragon squats" and other "in motion" routines that may correspond with some of your stances in our warm-ups. It's been a while so I may have left some things out...but I wanted your good question to at least get a partial response.