The alligator snapping turtle is a huge aquatic species with a significantly massive head (compared to other species of turtles). The carapace (upper shell) has 3 well known ridges — 1 alongside the middle line and 1 on either side. There is certainly an extra row of scutes (horny scales) https://sambavapantherchameleon90134.blogolize.com/article-under-review-67773614