|He/She/He Limpet (Jan Delsing/BioLib)
Mr./Mrs. Limpet had neither the vanity nor the desire to try for the cover of Vanity Fair but was described by John R. Platt in a Scientific American blog as nearly extinct and the subject of efforts by scientists to learn how it breeds and reproduces to save it from extinction. (The Incredible Mr./Mrs. Limpet: The Endangered, Sex-Changing Sea Snail)
Most limpet species possess both male and female characteristics and change gender in their lives due to external environmental factors; Patella ferruginea, however, is unusual in changing gender then back again, scientists discovered. When and why still remains a mystery.
The scientists wrote in a paper that, this discovery provides "new direction for research into the mechanisms and factors driving sex change and its effects on the population dynamics" for the species, which may help to inform conservation strategies to keep it from extinction.
Meanwhile, in an attempt to ride the media frenzy on June 1, the endangered smalltooth sawfish muscled in on the news with the discovery that they are resorting to “virgin births” in the wild— perhaps in an effort to survive.
According to The Washington Post, “Female sawfish in Florida estuaries were found to have produced living offspring without the help of a male. Researchers found that 3 percent of sawfish in their study were the result of this unusual reproductive strategy.” (On the verge of extinction, female sawfish resort to ‘virgin births’ to survive)
In rare instances some vertebrate females have been known to switch between sexual and asexual reproduction depending on the availability of a mate. Reproducing without mating is called facultative parthenogenesis where an egg absorbs a genetically identical cell to create offspring about half as genetically diverse as the mother. These offspring often don't survive but enough are around in Florida to be counted.
OK. You read it here and in Scientific American and The Washington Post.
Vanity vanitatum, omnia vanitas.