While anatomists have known about preauricular pits since they were first documented by scientist Van Heusinger in 1864, it was Neil Shubin, a renowned evolutionary biologist and author of the groundbreaking book Your Inner Fish, who popularized a much more dramatic theory.
Shubin hypothesized that these tiny holes are actually an evolutionary leftover—specifically, an evolutionary remnant of fish gills.
It sounds like science fiction, but it makes incredible sense when you look at how human embryos develop. Those pharyngeal arches we mentioned earlier? In fish embryos, those exact same structures develop into gills. In human embryos, they develop into our jaws, our throats, and our ears.
According to Shubin’s theory, the preauricular pit is simply an ancient genetic echo from millions of years ago, a time when our earliest ancestors were still swimming in the prehistoric oceans. When you look at that tiny hole, you might literally be looking at a microscopic window into the evolutionary history of humanity. It is your inner fish saying hello.
