Macrocephaly is seen in lots of turtles in the southeastern U.S. (To easily find pictures of this, go to Instagram and go to these guys’ pages: groverbrown, alabamaturtles, luke_pearson2, and cheloniagodwin) However, I’ve seen it in a few Asian species as well.
Macrocephalic Revees turtles (although other species may be present in the same photos)
Macrocephalic Malayan Flat-Shelled Turtle:
(Photo from http://turtlesurvival.nonprofitsoapbox.com/component/taxonomy/term/summary/109/7#.XEegF7pOmEf )
I think it can happen in more species than you will typically see, it seems to mainly depend on the diet of the animal, although genetics have some influence as well. I’ve even seen it in a red eared slider that are only snails it’s entire life:
(Not my photo)
Macrocephalic Revees turtles (although other species may be present in the same photos)
Macrocephalic Malayan Flat-Shelled Turtle:
(Photo from http://turtlesurvival.nonprofitsoapbox.com/component/taxonomy/term/summary/109/7#.XEegF7pOmEf )
I think it can happen in more species than you will typically see, it seems to mainly depend on the diet of the animal, although genetics have some influence as well. I’ve even seen it in a red eared slider that are only snails it’s entire life:
(Not my photo)