The difference between Favia and Favites is very subtle but it can be distinguished from what i understand by this: Favia have colonies of polyps that have monocentric corralites (one mouth at the centre of each polyp) , the polyps themselves are aligned in what is called "plocoid" fashion. Basically this means that the polyps are notably distinct from each other and share only epitheca e(or the place where a polyp joins the substrate and forms a vertical wall upward).
Favites on the other hand also have monocentric corallites but the polyp colonies are organised in cerioid fashion, meaning that all polyps share walls and are compacted very closely together, often forming polygonal structures. They are not so compacted as to form valleys ("meandroid") as in Playtgyra Sp. but they are visibly more "bunched" than Favia.
"Favid" as far as i understand it is just a loose group term used to categeorise all "brain" corals of a specific form (Favia, Favites and sometimes including Platygyra, Leptoria and Montastrea Spp.). Its not an actual genus or species.
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