Science & Tech

This asexual worm hasn’t had sex in 18 million years

A species of asexual translucent worm has been discovered by scientists.

A species of asexual translucent worm has been discovered by scientists.

Diploscapter pachys hasn’t had sex in roughly 18 million years, when it parted from its parent species, by exclusively practicing asexual reproduction.

The species has survived for the entire time by copying itself, while still maintaining fairly high genetic diversity.

The revelation has taken scientists by surprise – with asexual species usually dying out due to genetic mutations.

Biologist David Fitch of New York University said: “It has been a longstanding mystery in biology how some asexual animals have survived for so many generations.”

Sexual reproduction evolved more than one billion years ago as a means to increasing the rate of natural selection and evolution.

It also results in a natural mixing of genes which can avoid the random mutations that commonly occur in DNA from building up over time.

Egyptian pharaohs famously suffered the consequence of not mixing genes, with some extreme disorders developing due to the inbreeding of their ancestors.

“Somehow, the worm fused its ancestors’ six pairs of chromosomes into one pair of huge chromosomes.

“It did away with a major step of meiosis — the part of the reproductive process where chromosomes reshuffle before splitting into two cells,” Rae Ellen Bichell told SmartNews.

Birchill explains that reproduction is a time-consuming means of reproducing.

Organisms must spend time and energy competing for mates, and only half of the population is capable of creating new organisms at the end of the process.

That’s most likely why Diploscapter pachys decided to stop having sex some 18 millions ago.

Only two other organisms are know to have just a single pair of chromosomes: the nematode Parascaris univalens and the ant Myrmecia croslandi.

This includes the Unisexual mole salamanders, which steals sperm from other related species to use for their own reproduction.

Asexuality in humans is defined by Stonewall as someone who does not experience sexual attraction.

Each asexual person experiences things like relationships, attraction and arousal differently.

And, like all other terms, it’s a word that asexual people use to help identify and describe themselves.

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Smithsonian Mag
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