While looking in my dictionary for "opisthography" I noticed medical word "opisthotonus". I
can't remember the cause of it, but it means the patient's body is arched backwards.

Also "opisthognathous" = having a receding jaw. Characteristic of some fishes. There used to
be a comic strip character "Andy Gump" whose distinctive physiognomic feature was a markedly
undersized lower jaw.
Other facial faults are a retrorse or less so retroussé proboscis.