Study says the finding of an “intermittent anus” may shed light on the evolution of our own.
A scientist has discovered an unusual feature on the morphology of a jellyfish-like creature—an “intermittent anus” that disappears after it defecates.
The species has been the subject of much scientific research. Comb jellies, such as Mnemiopsis leidyi, evolved more than 500 million years ago. The first animals on Earth did not have a dedicated anus—a separate opening for waste turned up far later in the evolutionary timeline. Instead, these ancient creatures had one opening that served as both their mouth and anus. Many of their descendents alive today still have this digestive set-up.
In 2016, scientists discovered that unlike other similar creatures, Mnemiopsis leidyi did have an anus, Science magazine reports. At a meeting dedicated to ctenophores, William Browne of the University of Miami in Florida revealed videos of comb jellies defecating—shocking evolutionary biologists in attendance.
He found that timing between defecations varied depending on the size of the creature, ranging from less than 10 minutes through to around an hour.
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