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A Beetle's Genitals Just Complicated a Classic Evolutionary Story


A Beetle’s Genitals Just Complicated a Classic Evolutionary Story
Katherine J. Wu
© Julian Baur
The story of seed-beetle sex has often been told in a very particular way, with the male in the evolutionary driver’s seat, his hapless mate taken along for a grudging ride. A quick glance at the insect’s penis makes it easy to see why: The appendage is tipped with hundreds of sharp, hard spines that give it the appearance of an elaborate mace. This terrifying surfeit of spikes riddles the female’s reproductive tract with punctures and scrapes that can leave, as the biologist Göran Arnqvist puts it, some “quite massive scars.” ....

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Your Butt Is Getting in the Way of Science


The Body’s Most Embarrassing Organ Is an Evolutionary Marvel
Katherine J. Wu
© Provided by The Atlantic
Arne Svenson, Stray #55
To peer into the soul of a sea cucumber, don’t look to its face; it doesn’t have one. Gently turn that blobby body around, and gaze deep into its marvelous, multifunctional anus.
The sea cucumber s posterior is so much more than an exit hole for digestive waste. It is also a makeshift mouth that gobbles up bits of algae; a faux lung, latticed with tubes that exchange gas with the surrounding water; and a weapon that, in the presence of danger, can launch a sticky, stringy web of internal organs to entangle predators. It can even, on occasion, be a home for shimmering pearlfish, which wriggle inside the bum when it billows open to breathe. It would not be inaccurate to describe a sea cucumber as an extraordinary anus that just so happens to have a body around it. As Rebecca Helm, a jellyfish biologist at the Un ....

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