Theyre all encrusting type corals but they will have different skeletal structures. Chalices will look more like a plate, favias have more prominent corallites (the structure that gives them the rounded shaped polyps) and en echinata is like a mix of the two lolok folks, even Ann, but she's busy. question. What is the difference between a chalice and say, an acan echinata? favia? They look the same.