Thus, you can imagine my delight when science jumped into the act, photographing just such a "being," a transgendered individual, both male and female, they call Saccorhytus.
Here's what they say about her: "Saccorhytus was about a millimetre in size, and is thought to have lived between grains of sand on the sea bed. Saccorhytus was also covered with a thin, relatively flexible skin and muscles. It probably moved around by wriggling."
quote from http://www.bbc.com/news/science-environment-38800987